基于TCP的在线词典系统(分阶段实现)

  • 开发
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1.功能说明

一共四个功能：

                注册

                登录

                查询单词

                查询历史记录

单词和解释保存在文件中，单词和解释只占一行,

一行最多300个字节，单词和解释之间至少有一个空格。

2.功能演示

3、分阶段完成各个功能

3.1 完成服务器和客户端的连接

service.c

#include <head.h>

int main(int argc, const char *argv[])
{
    // 入参合理性检查
    if (3 != argc)
    {
        printf("usage error:%s <port> <ip>\n", argv[0]);
        exit(-1);
    }
    // 创建套接字
    int sockfd;
    struct sockaddr_in serveraddr;
    memset(&serveraddr, 0, sizeof(serveraddr));
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
        perror("sockfd error");
        exit(-1);
    }
    // 填充服务器网络信息结构体
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(atoi(argv[2]));
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
    socklen_t serveraddr_len = sizeof(serveraddr);
    struct sockaddr_in clientaddr;
    socklen_t clientaddr_len = sizeof(clientaddr);
    memset(&clientaddr, 0, sizeof(clientaddr));
    // 绑定
    if (-1 == bind(sockfd, (struct sockaddr *)&serveraddr, serveraddr_len))
    {
        perror("bind error");
        exit(-1);
    }
    // 监听
    printf("%d\n", sockfd);
    if (listen(sockfd, 5) < 0)
    {
        perror("fail to listen");
        exit(-1);
    }
    int acceptfd;
    while (1)
    {
        acceptfd = 0;
        printf("阻塞等待客户端连接...\n");
        if (-1 == (acceptfd = accept(sockfd, (struct sockaddr *)&clientaddr, &clientaddr_len)))
        {
            perror("accept errror");
            exit(-1);
        }
        printf("111111111\n");
        printf("客户端[%s][%d]连接成功...\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
        pid_t pid;
        pid = fork();
        if (pid == -1)
        {
            perror("fork error");
            exit(-1);
        }
        else if (pid == 0)
        {
            // 子进程
        }
        else
        {
            // 父进程
            wait(NULL);
        }
    }

    return 0;
}

client.c

#include <head.h>
void print_menu();
int main(int argc, const char *argv[])
{
    // 入参合理性检查
    if (3 != argc)
    {
        printf("usage error:%s <ip> <port>\n", argv[1]);
        exit(-1);
    }
    // 创建套接字
    int sockfd;
    if (-1 == (sockfd = socket(AF_INET, SOCK_STREAM, 0)))
    {
        perror("socket error");
        exit(-1);
    }
    // 填充服务器网络信息结构体
    struct sockaddr_in serveraddr;
    socklen_t serveraddr_len = sizeof(serveraddr);
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
    serveraddr.sin_port = htons(atoi(argv[2]));
    if (-1 == connect(sockfd, (struct sockaddr *)&serveraddr, serveraddr_len))
    {
        perror("connect error");
        exit(-1);
    }
    printf("连接服务器成功...\n");
    while (1)
    {
        print_menu();
        sleep(10);
    }
    return 0;
}
void print_menu()
{
    printf("-------------------------------------\n");
    printf("|    1.regist     2.login     3.quit|\n");
    printf("-------------------------------------\n");
    return;
}

3.2 新增完成注册和退出功能

service.c

#include <head.h>
#include <sqlite3.h> //sqlite3
#define R 1
#define L 2
#define Q 3
#define H 4
#define DATABASE "test.db"
typedef struct _MSG
{
    int type;
    char name[32];
    char data[128];
} msg_t;
void do_regist(msg_t *msg, int acceptfd, sqlite3 *my_db);
void do_quit(msg_t *msg, int acceptfd, sqlite3 *my_db);
int main(int argc, const char *argv[])
{
    // 入参合理性检查
    if (3 != argc)
    {
        printf("usage error:%s <port> <ip>\n", argv[0]);
        exit(-1);
    }
    // 创建数据库
    sqlite3 *my_db;
    if (SQLITE_OK != sqlite3_open(DATABASE, &my_db))
    {
        printf("sqlite3 open error:%s\n", sqlite3_errmsg(my_db));
        exit(-1);
    }
    // 创建套接字
    int sockfd;
    struct sockaddr_in serveraddr;
    memset(&serveraddr, 0, sizeof(serveraddr));
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
        perror("sockfd error");
        exit(-1);
    }
    // 填充服务器网络信息结构体
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(atoi(argv[2]));
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
    socklen_t serveraddr_len = sizeof(serveraddr);
    struct sockaddr_in clientaddr;
    socklen_t clientaddr_len = sizeof(clientaddr);
    memset(&clientaddr, 0, sizeof(clientaddr));
    // 绑定
    if (-1 == bind(sockfd, (struct sockaddr *)&serveraddr, serveraddr_len))
    {
        perror("bind error");
        exit(-1);
    }
    // 监听
    printf("%d\n", sockfd);
    if (listen(sockfd, 5) < 0)
    {
        perror("fail to listen");
        exit(-1);
    }
    int acceptfd;
    msg_t msg;
    while (1)
    {
        acceptfd = 0;
        printf("阻塞等待客户端连接...\n");
        if (-1 == (acceptfd = accept(sockfd, (struct sockaddr *)&clientaddr, &clientaddr_len)))
        {
            perror("accept errror");
            exit(-1);
        }
        printf("111111111\n");
        printf("客户端[%s][%d]连接成功...\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
        pid_t pid;
        pid = fork();
        if (pid == -1)
        {
            perror("fork error");
            exit(-1);
        }
        else if (pid == 0)
        {
            while (1)
            {
                if (-1 == recv(acceptfd, &msg, sizeof(msg), 0))
                {
                    perror("recv error");
                    exit(-1);
                }
                // printf("msg_type = %d\n", msg.type);
                // printf("msg.name = %s\n", msg.name);
                // printf("msg.data = %s\n", msg.data);
                switch (msg.type)
                {
                case R:
                    do_regist(&msg, acceptfd, my_db);
                    break;
                case L:
                    break;
                case Q:
                    printf("客户端[%s][%d]退出了...\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
                    do_quit(&msg, acceptfd, my_db);
                    break;
                case H:

                    break;
                }
            }
            // 子进程
        }
        else
        {
            // 父进程
            close(acceptfd);
            wait(NULL);
        }
    }

    return 0;
}
void do_regist(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    char sqlstr[512] = {0};
    char *errmsg;
    // printf("msg]msg.type = %d\n", msg->type);
    // printf("[msg]msg.name = %s\n", msg->name);
    // printf("[msg]msg.data = %s\n", msg->data);
    sprintf(sqlstr, "insert into user values('%s','%s')", msg->name, msg->data);
    // printf("[do_regist]sqlstr = %s\n", sqlstr);
    if (sqlite3_exec(my_db, sqlstr, NULL, NULL, &errmsg) != SQLITE_OK)
    {
        printf("errmsg = %s\n", errmsg);
        sprintf(msg->data, "user already exit,regist fail");
    }
    else
    {
        strcpy(msg->data, "OK");
    }
    // printf("[do_regist_send]msg.type = %d\n", msg->type);
    // printf("[do_regist_send]msg.name = %s\n", msg->name);
    // printf("[do_regist_send]msg.data = %s\n", msg->data);
    if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    return;
}
void do_quit(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    exit(-1);
}

client.c

#include <head.h>
#include <sqlite3.h> //sqlite3
#define R 1
#define L 2
#define Q 3
#define H 4
#define DATABASE "test.db"
typedef struct _MSG
{
    int type;
    char name[32];
    char data[128];
} msg_t;
void print_menu();
void login_user(msg_t msg, int sockfd);
void exit_system(msg_t *msg, int sockfd);
int regist_user(msg_t *msg, int sockfd);
int check_user(msg_t msg, int sockfd);
int main(int argc, const char *argv[])
{
    // 入参合理性检查
    if (3 != argc)
    {
        printf("usage error:%s <ip> <port>\n", argv[1]);
        exit(-1);
    }
    // 创建套接字
    sqlite3 *my_db;
    if (SQLITE_OK != sqlite3_open(DATABASE, &my_db))
    {
        printf("sqlite3 open error:%s\n", sqlite3_errmsg(my_db));
        exit(-1);
    }
    int sockfd;
    if (-1 == (sockfd = socket(AF_INET, SOCK_STREAM, 0)))
    {
        perror("socket error");
        exit(-1);
    }

    // 填充服务器网络信息结构体
    struct sockaddr_in serveraddr;
    socklen_t serveraddr_len = sizeof(serveraddr);
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
    serveraddr.sin_port = htons(atoi(argv[2]));
    int choose = 0;
    msg_t msg;
    if (-1 == connect(sockfd, (struct sockaddr *)&serveraddr, serveraddr_len))
    {
        perror("connect error");
        exit(-1);
    }
    printf("连接服务器成功...\n");
    while (1)
    {
        print_menu();
        printf("请输入您的选择:");
        scanf("%d", &choose);
        switch (choose)
        {
        case R:
            regist_user(&msg, sockfd);
        case L:
            login_user(msg, sockfd);
            break;
        case Q:
            exit_system(&msg, sockfd);
            break;
        }
    }

    return 0;
}
void print_menu()
{
    printf("-------------------------------------\n");
    printf("|    1.regist     2.login     3.quit|\n");
    printf("-------------------------------------\n");
    return;
}
void exit_system(msg_t *msg, int sockfd)
{
    system("clear");
    msg->type = Q;
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    close(sockfd);
    printf("欢迎下次使用基于TCP的在线词典系统...\n");
    exit(-1);
}
int check_user(msg_t msg, int sockfd)
{
    printf("[check_user_send]msg.type = %d\n", msg.type);
    printf("[check_user_send]msg.name = %s\n", msg.name);
    printf("[check_user_send]msg.data = %s\n", msg.data);
    if (-1 == send(sockfd, &msg, sizeof(msg), 0))
    {
        perror("send error");
        exit(-1);
    }
    memset(&msg, 0, sizeof(msg));
    if (-1 == recv(sockfd, &msg, sizeof(msg), 0))
    {
        perror("recv error");
        exit(-1);
    }
    printf("[check_user_recv]msg.type = %d\n", msg.type);
    printf("[check_user_recv]msg.name = %s\n", msg.name);
    printf("[check_user_recv]msg.data = %s\n", msg.data);
    if (strcmp(msg.data, "user already exit,regist fail") == 0)
    {
        return -1;
    }
    else
    {
        return 0;
    }
}
int regist_user(msg_t *msg, int sockfd)
{
    memset(msg, 0, sizeof(msg_t));
    msg->type = R;
    printf("[注册]请输入用户名:");
    scanf("%s", msg->name);
    printf("[注册]请输入密码:");
    scanf("%s", msg->data);
    // printf("[regist_user]msg.type = %d\n", msg->type);
    // printf("[regist_user]msg.name = %s\n", msg->name);
    // printf("[regist_user]msg.data = %s\n", msg->data);
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    // printf("[regist_send]msg.type = %d\n", msg->type);
    // printf("[regist_send]msg.name = %s\n", msg->name);
    // printf("[regist_send]msg.data = %s\n", msg->data);
    memset(msg, 0, sizeof(msg));
    if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("recv error");
        exit(-1);
    }
    // printf("[regist_recv]msg.type = %d\n", msg->type);
    // printf("[regist_recv]msg.name = %s\n", msg->name);
    // printf("[regist_recv]msg.data = %s\n", msg->data);
    if (strncmp(msg->data, "OK", 3) == 0)
    {
        printf("注册成功...\n");
        return 1;
    }
    printf("用户名已存在，注册失败...\n");
    return 0;
}
void login_user(msg_t msg, int sockfd)
{
    return;
}

结果图：

3.3 新增完成登录功能（密码和用户名都正确才能登录成功）

service.c

#include <head.h>
#include <sqlite3.h> //sqlite3
#define R 1
#define L 2
#define Q 3
#define S 4
#define H 5
#define E 6
#define DATABASE "test.db"
#define FILEPATH "./dict.txt"
typedef struct _MSG
{
    int type;
    char name[256];
    char data[128];
} msg_t;
void do_regist(msg_t *msg, int acceptfd, sqlite3 *my_db);
void do_quit(msg_t *msg, int acceptfd, sqlite3 *my_db);
int do_login(msg_t *msg, int acceptfd, sqlite3 *my_db);
int do_search(msg_t *msg, int acceptfd, sqlite3 *my_db, FILE *fp);
void getdata(char *data);
void do_history(msg_t *msg, int acceptfd, sqlite3 *my_db);
int flafs = 0; // 全局变量 使得系统只有在第一次查询时 打开一次文件，第二次不用再打开
int main(int argc, const char *argv[])
{
    // 入参合理性检查
    if (3 != argc)
    {
        printf("usage error:%s <port> <ip>\n", argv[0]);
        exit(-1);
    }
    // 创建数据库
    sqlite3 *my_db;
    if (SQLITE_OK != sqlite3_open(DATABASE, &my_db))
    {
        printf("sqlite3 open error:%s\n", sqlite3_errmsg(my_db));
        exit(-1);
    }

    FILE *fp; // 传入do_search();
    // 创建套接字
    int sockfd;
    struct sockaddr_in serveraddr;
    memset(&serveraddr, 0, sizeof(serveraddr));
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
        perror("sockfd error");
        exit(-1);
    }
    // 填充服务器网络信息结构体
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(atoi(argv[2]));
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
    socklen_t serveraddr_len = sizeof(serveraddr);
    struct sockaddr_in clientaddr;
    socklen_t clientaddr_len = sizeof(clientaddr);
    memset(&clientaddr, 0, sizeof(clientaddr));
    // 绑定
    if (-1 == bind(sockfd, (struct sockaddr *)&serveraddr, serveraddr_len))
    {
        perror("bind error");
        exit(-1);
    }
    // 监听
    printf("%d\n", sockfd);
    if (listen(sockfd, 5) < 0)
    {
        perror("fail to listen");
        exit(-1);
    }
    int acceptfd;
    msg_t msg;
    while (1)
    {
        acceptfd = 0;
        printf("阻塞等待客户端连接...\n");
        if (-1 == (acceptfd = accept(sockfd, (struct sockaddr *)&clientaddr, &clientaddr_len)))
        {
            perror("accept errror");
            exit(-1);
        }
        printf("111111111\n");
        printf("客户端[%s][%d]连接成功...\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
        pid_t pid;
        pid = fork();
        if (pid == -1)
        {
            perror("fork error");
            exit(-1);
        }
        else if (pid == 0)
        {
            while (1)
            {
                if (-1 == recv(acceptfd, &msg, sizeof(msg), 0))
                {
                    perror("recv error");
                    exit(-1);
                }
                printf("[main]msg_type = %d\n", msg.type);
                printf("[main]msg.name = %s\n", msg.name);
                printf("[main]msg.data = %s\n", msg.data);
                switch (msg.type)
                {
                case R:
                    do_regist(&msg, acceptfd, my_db);
                    break;
                case L:
                    do_login(&msg, acceptfd, my_db);
                    break;
                case Q:
                    printf("客户端[%s][%d]退出了...\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
                    do_quit(&msg, acceptfd, my_db);
                    break;
                case S:
                    do_search(&msg, acceptfd, my_db, fp);
                    break;
                case H:
                    do_history(&msg, acceptfd, my_db);
                    break;
                case E:

                    break;
                }
            }
            // 子进程
        }
        else
        {
            // 父进程
            close(acceptfd);
            wait(NULL);
        }
    }

    return 0;
}
void getdata(char *data)
{
    time_t t;
    struct tm *tp;
    time(&t);
    tp = localtime(&t);
    sprintf(data, "%d-%d-%d %d:%d:%d", 1900 + tp->tm_year, 1 + tp->tm_mon, tp->tm_mday,
            tp->tm_hour, tp->tm_min, tp->tm_sec);
}
void do_history(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    char databuff[128] = {0};
    getdata(databuff);
    memset(msg, 0, sizeof(msg_t));
    msg->type = H;
    char sqlbuff[256] = {0};
    sprintf(sqlbuff, "select * from record");
    return;
}
int do_search(msg_t *msg, int acceptfd, sqlite3 *my_db, FILE *fp)
{
    char buff[256] = {0};
    printf("要查询的单词为:%s\n", msg->data);
    int word_len = 0;
    char *p = NULL;
    word_len = strlen(msg->data);
    printf("要查询的单词%s的长度%d\n", msg->data, word_len);
    // if (flafs == 0)
    // {
    // printf("第一次查询,单词文件打开中...\n");
    if (NULL == (fp = fopen(FILEPATH, "r")))
    {
        printf("[第一次]打开单词文件失败...\n");
        strcpy(msg->data, "open error or EOF");
        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
    }
    p = NULL;
    fgets(buff, sizeof(buff), fp);
    while (strncmp(msg->data, buff, word_len) != 0)
    {
        if (fgets(buff, sizeof(buff), fp) == NULL)
        {
            strcpy(msg->data, "NO_WORLD");
            // printf("11111111111111111\n");
            printf("[do_search]msg.type = %d\n", msg->type);
            printf("[do_search]msg.name = %s\n", msg->name);
            printf("[do_search]msg.data = %s\n", msg->data);
            if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
            {
                perror("send error");
                exit(-1);
            }
            return 0;
        }
    }
    printf("[strncmp]msg.data = %s\n", msg->data);
    printf("[strncmp]buff=%s\n", buff);
    p = buff;
    p += word_len;
    if (*p != ' ')
    {
        // printf("22222222222\n");
        strcpy(msg->data, "NO_WORLD");
        printf("[do_search]msg.type = %d\n", msg->type);
        printf("[do_search]msg.name = %s\n", msg->name);
        printf("[do_search]msg.data = %s\n", msg->data);
        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        return 0;
    }
    while (*p == ' ')
    {
        p++;
    }
    strcpy(msg->data, p);
    printf("[do_search]msg.type = %d\n", msg->type);
    printf("[do_search]msg.name = %s\n", msg->name);
    printf("[do_search]msg.data = %s\n", msg->data);
    if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    fclose(fp);
    return 1;
}

void do_regist(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    char sqlstr[512] = {0};
    char *errmsg;
    printf("[msg]msg.type = %d\n", msg->type);
    printf("[msg]msg.name = %s\n", msg->name);
    printf("[msg]msg.data = %s\n", msg->data);
    sprintf(sqlstr, "insert into user values('%s','%s')", msg->name, msg->data);
    printf("[do_regist]sqlstr = %s\n", sqlstr);
    if (sqlite3_exec(my_db, sqlstr, NULL, NULL, &errmsg) != SQLITE_OK)
    {
        printf("errmsg = %s\n", errmsg);
        strcpy(msg->data, "user already exit,regist fail");
    }
    else
    {
        strcpy(msg->data, "OK");
    }
    printf("[do_regist_send]msg.type = %d\n", msg->type);
    printf("[do_regist_send]msg.name = %s\n", msg->name);
    printf("[do_regist_send]msg.data = %s\n", msg->data);
    if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    return;
}
// int callback(void *arg, int ncolumn, char **f_value, char **f_name)
// {
//     int i = 0;
//     int flag = 0;
//     msg_t *msg_callback = (msg_t *)arg;
//     printf("[msg_callbackmsg_callback.type = %d\n", msg_callback->type);
//     printf("[msg_callback]msg_callback.name = %s\n", msg_callback->name);
//     printf("[msg_callback]msg_callback.data = %s\n", msg_callback->data);
//     if (0 == flag)
//     {
//         // 先打印字段名
//         for (i = 0; i < ncolumn; i++)
//         {
//             // strcpy(msg_callback->data, "user or passwd ereror");
//             printf("\n");
//         }
//         flag = 1;
//     }
//     // 再打印字段的值
//     for (i = 0; i < ncolumn; i++)
//     {
//         if ((f_value[i] != msg_callback->name) || (f_value[i] != msg_callback->data))
//         {
//             strcpy(msg_callback->data, "user or passwd ereror");
//         }
//         else
//         {
//             strcpy(msg_callback->data, "OK");
//         }
//     }
//     return 0; // 这里的回调函数要求必须有返回值 如果没有会报错 query aborted
// }

int do_login(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    char sqlstr[512] = {0};
    printf("[msg]msg.type = %d\n", msg->type);
    printf("[msg]msg.name = %s\n", msg->name);
    printf("[msg]msg.data = %s\n", msg->data);
    sprintf(sqlstr, "select * from user where name='%s' and passwd='%s'", msg->name, msg->data);
    printf("[do_login]sqlstr = %s\n", sqlstr);
    char *errmsg, **result;
    int nrow, ncolumn;
    // 通过sqlite3_get_table函数查询记录是否存在
    sprintf(sqlstr, "select * from user where name = '%s' and passwd = '%s'", msg->name, msg->data);
    if (sqlite3_get_table(my_db, sqlstr, &result, &nrow, &ncolumn, &errmsg) != SQLITE_OK)
    {
        printf("error : %s\n", errmsg);
    }
    // 通过nrow参数判断是否能够查询到疾记录，如果值为0，则查询不到，如果值为非0，则查询到
    if (nrow == 0)
    {
        strcpy(msg->data, "user or passwd ereror");
        printf("[do_login_send]msg.type = %d\n", msg->type);
        printf("[do_login_send]msg.name = %s\n", msg->name);
        printf("[do_login_send]msg.data = %s\n", msg->data);
        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        return 0;
    }
    else
    {
        strncpy(msg->data, "OK", 256);
        printf("[do_login_send]msg.type = %d\n", msg->type);
        printf("[do_login_send]msg.name = %s\n", msg->name);
        printf("[do_login_send]msg.data = %s\n", msg->data);

        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        return 1;
    }
}
void do_quit(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    exit(-1);
}

client.c

#include <head.h>
#include <sqlite3.h> //sqlite3
#define R 1
#define L 2
#define Q 3
#define S 4
#define H 5
#define E 6
#define DATABASE "test.db"
#define FILEPATH "./dict.txt"
typedef struct _MSG
{
    int type;
    char name[256];
    char data[128];
} msg_t;
void print_menu();
int login_user(msg_t *msg, int sockfd, sqlite3 *my_db);
void exit_system(msg_t *msg, int sockfd);
int regist_user(msg_t *msg, int sockfd);
int check_user(msg_t msg, int sockfd);
int search_world(msg_t *msg, int sockfd, sqlite3 *my_db);
int exit_search(msg_t *msg, int sockfd);
void query_menu();
void printf_history(msg_t *msg, int sockfd, sqlite3 *my_db);
int main(int argc, const char *argv[])
{
    // 入参合理性检查
    if (3 != argc)
    {
        printf("usage error:%s <ip> <port>\n", argv[1]);
        exit(-1);
    }
    // 创建套接字
    sqlite3 *my_db;
    if (SQLITE_OK != sqlite3_open(DATABASE, &my_db))
    {
        printf("sqlite3 open error:%s\n", sqlite3_errmsg(my_db));
        exit(-1);
    }

    int sockfd;
    if (-1 == (sockfd = socket(AF_INET, SOCK_STREAM, 0)))
    {
        perror("socket error");
        exit(-1);
    }

    // 填充服务器网络信息结构体
    struct sockaddr_in serveraddr;
    socklen_t serveraddr_len = sizeof(serveraddr);
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
    serveraddr.sin_port = htons(atoi(argv[2]));
    int choose = 0;
    msg_t msg;
    if (-1 == connect(sockfd, (struct sockaddr *)&serveraddr, serveraddr_len))
    {
        perror("connect error");
        exit(-1);
    }
    printf("连接服务器成功...\n");
NEXT2:
    while (1)
    {

        print_menu();

        printf("请输入您的选择(1-3):");
        scanf("%d", &choose);

        switch (choose)
        {
        case R:
            regist_user(&msg, sockfd);
            break;
        case L:
            if (login_user(&msg, sockfd, my_db) == 1)
            {
                goto NEXT;
            }
            break;
        case Q:
            close(sockfd);
            // system("clear");
            printf("欢迎下次使用基于TCP的在线词典系统...\n");
            exit(0);
        }
    }
NEXT:
    while (1)
    {
        // system("clear");
        query_menu();
        printf("请输入您的选择(4-6):");
        scanf("%d", &choose);
        switch (choose)
        {
        case S:
            search_world(&msg, sockfd, my_db);
            break;
        case H:
            printf_history(&msg, sockfd, my_db);
            break;
        case E:
            goto NEXT2;
            break;
        }
    }

    return 0;
}
void print_menu()
{
    printf("-------------------------------------\n");
    printf("|  1.regist     2.login     3.quit  |\n");
    printf("-------------------------------------\n");
    return;
}
void query_menu()
{
    printf("-------------------------------------\n");
    printf("|  4.search    5.history    6.quit  |\n");
    printf("-------------------------------------\n");
    return;
}
void exit_system(msg_t *msg, int sockfd)
{
    system("clear");
    msg->type = Q;
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    close(sockfd);
    printf("欢迎下次使用基于TCP的在线词典系统...\n");
    exit(-1);
}

void printf_history(msg_t *msg, int sockfd, sqlite3 *my_db)
{
    // memset(msg, 0, sizeof(msg_t));
    // printf("[printf_history]msg.type = %d\n", msg->type);
    // printf("[printf_history]msg.name = %s\n", msg->name); // 单词
    // printf("[printf_history]msg.data = %s\n", msg->data); // OK
    msg->type = H;
    printf("<---历史记录如下--->\n");
    while (1)
    {
        if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
        {
            perror("recv error");
            exit(-1);
        }
        if (strcmp(msg->data, "***OVER***") == 0)
        {
            break;
        }
        printf("%s:%s\n", msg->name, msg->data);
    }
    return;
}
int regist_user(msg_t *msg, int sockfd)
{
    memset(msg, 0, sizeof(msg_t));
    msg->type = R;
    printf("[注册]请输入用户名:");
    scanf("%s", msg->name);
    printf("[注册]请输入密码:");
    scanf("%s", msg->data);
    // printf("[regist_user]msg.type = %d\n", msg->type);
    // printf("[regist_user]msg.name = %s\n", msg->name);
    // printf("[regist_user]msg.data = %s\n", msg->data);
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    // printf("[regist_send]msg.type = %d\n", msg->type);
    // printf("[regist_send]msg.name = %s\n", msg->name);
    // printf("[regist_send]msg.data = %s\n", msg->data);
    memset(msg, 0, sizeof(msg));
    if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("recv error");
        exit(-1);
    }
    // printf("[regist_recv]msg.type = %d\n", msg->type);
    // printf("[regist_recv]msg.name = %s\n", msg->name);
    // printf("[regist_recv]msg.data = %s\n", msg->data);
    if (strcmp(msg->data, "OK") == 0)
    {
        printf("注册成功...\n");
        return 1;
    }
    printf("用户名已存在，注册失败...\n");
    return 0;
}
int login_user(msg_t *msg, int sockfd, sqlite3 *my_db)
{
    memset(msg, 0, sizeof(msg_t));
    msg->type = L;
    printf("[登录]请输入用户名:");
    scanf("%s", msg->name);
    printf("[登录]请输入密码:");
    scanf("%s", msg->data);
    // printf("[login_user]msg.type = %d\n", msg->type);
    // printf("[login_user]msg.name = %s\n", msg->name);
    // printf("[login_user]msg.data = %s\n", msg->data);
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        return -1;
    }
    // printf("[login_user_send]msg.type = %d\n", msg->type);
    // printf("[login_user_send]msg.name = %s\n", msg->name);
    // printf("[login_user_send]msg.data = %s\n", msg->data);
    // memset(msg, 0, sizeof(msg_t));
    if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("recv error");
        return -1;
    }
    // printf("[login_user_recv]msg.type = %d\n", msg->type);
    // printf("[login_user_recv]msg.name = %s\n", msg->name);
    // printf("[login_user_recv]msg.data = %s\n", msg->data);

    if (strcmp(msg->data, "OK") == 0)
    {
        printf("登录成功...\n");
        return 1;
    }
    printf("用户名或密码错误...\n");
    return 0;
}
// int exit_search(msg_t *msg, int sockfd)
// {
//     return 0;
// }
int search_world(msg_t *msg, int sockfd, sqlite3 *my_db)
{

    // msg->type = S;
    while (1)
    {
        // memset(msg, 0, sizeof(msg_t));
        msg->type = S;
        printf("[查询]请输入要查询的单词(按#退出):");
        scanf("%s", msg->data);
        if (msg->data[strlen(msg->data) - 1] == '\n')
        {
            msg->data[strlen(msg->data) - 1] = '\0';
        }
        // printf("[scanf]msg->name = %s\n", msg->name);
        if (strcmp(msg->data, "#") == 0)
        {
            printf("你主动退出了查单词功能...\n");
            break;
        }
        // printf("[do_search_send]msg.type = %d\n", msg->type);
        // printf("[do_search_send]msg.name = %s\n", msg->name);
        // printf("[do_search_send]msg.data = %s\n", msg->data);
        if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        memset(msg, 0, sizeof(msg));

        if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
        {
            perror("recv error");
            exit(-1);
        }
        // printf("[do_search_recv]msg.type = %d\n", msg->type);
        // printf("[do_search_recv]msg.name = %s\n", msg->name);
        // printf("[do_search_recv]msg.data = %s\n", msg->data);
        if (strncmp(msg->data, "NO_WORLD", 8) == 0)
        {
            printf("[*****没有此单词*****]...\n");
            // return 0;
        }
        else
        {
            printf("[*****解释*****]:%s", msg->data);
        }
    }
    return 0;
}

int check_user(msg_t msg, int sockfd)
{
    // printf("[check_user_send]msg.type = %d\n", msg.type);
    // printf("[check_user_send]msg.name = %s\n", msg.name);
    // printf("[check_user_send]msg.data = %s\n", msg.data);
    if (-1 == send(sockfd, &msg, sizeof(msg), 0))
    {
        perror("send error");
        exit(-1);
    }
    memset(&msg, 0, sizeof(msg));
    if (-1 == recv(sockfd, &msg, sizeof(msg), 0))
    {
        perror("recv error");
        exit(-1);
    }
    // printf("[check_user_recv]msg.type = %d\n", msg.type);
    // printf("[check_user_recv]msg.name = %s\n", msg.name);
    // printf("[check_user_recv]msg.data = %s\n", msg.data);
    if (strcmp(msg.data, "user already exit,regist fail") == 0)
    {
        return -1;
    }
    else
    {
        return 0;
    }
}

运行结果图

 

3.4 完成查询单词功能（search）

单词文件

链接：https://pan.baidu.com/s/17qgZZpO7YyyQ0pCLYclg8A 
提取码：关注收藏后，私信获取

service.c

#include <head.h>
#include <sqlite3.h> //sqlite3
#define R 1
#define L 2
#define Q 3
#define S 4
#define H 5
#define E 6
#define DATABASE "test.db"
#define FILEPATH "./dict.txt"
typedef struct _MSG
{
    int type;
    char name[256];
    char data[128];
} msg_t;
void do_regist(msg_t *msg, int acceptfd, sqlite3 *my_db);
void do_quit(msg_t *msg, int acceptfd, sqlite3 *my_db);
int do_login(msg_t *msg, int acceptfd, sqlite3 *my_db);
int do_search(msg_t *msg, int acceptfd, sqlite3 *my_db, FILE *fp);
int flafs = 0; // 全局变量 使得系统只有在第一次查询时 打开一次文件，第二次不用再打开
int main(int argc, const char *argv[])
{
    // 入参合理性检查
    if (3 != argc)
    {
        printf("usage error:%s <port> <ip>\n", argv[0]);
        exit(-1);
    }
    // 创建数据库
    sqlite3 *my_db;
    if (SQLITE_OK != sqlite3_open(DATABASE, &my_db))
    {
        printf("sqlite3 open error:%s\n", sqlite3_errmsg(my_db));
        exit(-1);
    }

    FILE *fp; // 传入do_search();
    // 创建套接字
    int sockfd;
    struct sockaddr_in serveraddr;
    memset(&serveraddr, 0, sizeof(serveraddr));
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
        perror("sockfd error");
        exit(-1);
    }
    // 填充服务器网络信息结构体
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(atoi(argv[2]));
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
    socklen_t serveraddr_len = sizeof(serveraddr);
    struct sockaddr_in clientaddr;
    socklen_t clientaddr_len = sizeof(clientaddr);
    memset(&clientaddr, 0, sizeof(clientaddr));
    // 绑定
    if (-1 == bind(sockfd, (struct sockaddr *)&serveraddr, serveraddr_len))
    {
        perror("bind error");
        exit(-1);
    }
    // 监听
    printf("%d\n", sockfd);
    if (listen(sockfd, 5) < 0)
    {
        perror("fail to listen");
        exit(-1);
    }
    int acceptfd;
    msg_t msg;
    while (1)
    {
        acceptfd = 0;
        printf("阻塞等待客户端连接...\n");
        if (-1 == (acceptfd = accept(sockfd, (struct sockaddr *)&clientaddr, &clientaddr_len)))
        {
            perror("accept errror");
            exit(-1);
        }
        printf("111111111\n");
        printf("客户端[%s][%d]连接成功...\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
        pid_t pid;
        pid = fork();
        if (pid == -1)
        {
            perror("fork error");
            exit(-1);
        }
        else if (pid == 0)
        {
            while (1)
            {
                if (-1 == recv(acceptfd, &msg, sizeof(msg), 0))
                {
                    perror("recv error");
                    exit(-1);
                }
                printf("[main]msg_type = %d\n", msg.type);
                printf("[main]msg.name = %s\n", msg.name);
                printf("[main]msg.data = %s\n", msg.data);
                switch (msg.type)
                {
                case R:
                    do_regist(&msg, acceptfd, my_db);
                    break;
                case L:
                    do_login(&msg, acceptfd, my_db);
                    break;
                case Q:
                    printf("客户端[%s][%d]退出了...\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
                    do_quit(&msg, acceptfd, my_db);
                    break;
                case S:
                    do_search(&msg, acceptfd, my_db, fp);
                    break;
                case H:

                    break;
                case E:

                    break;
                }
            }
            // 子进程
        }
        else
        {
            // 父进程
            close(acceptfd);
            wait(NULL);
        }
    }

    return 0;
}
int do_search(msg_t *msg, int acceptfd, sqlite3 *my_db, FILE *fp)
{
    char buff[256] = {0};
    printf("要查询的单词为:%s\n", msg->name);
    int word_len = 0;
    char *p = NULL;
    word_len = strlen(msg->name);
    printf("要查询的单词%s的长度%d\n", msg->name, word_len);
    // if (flafs == 0)
    // {
    // printf("第一次查询,单词文件打开中...\n");
    if (NULL == (fp = fopen(FILEPATH, "r")))
    {
        printf("[第一次]打开单词文件失败...\n");
        strcpy(msg->name, "open error or EOF");
        strcpy(msg->data, "search error");
        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
    }
    p = NULL;
    fgets(buff, sizeof(buff), fp);
    while (strncmp(msg->name, buff, word_len) != 0)
    {
        if (fgets(buff, sizeof(buff), fp) == NULL)
        {
            strcpy(msg->name, "NO_WORLD");
            // printf("11111111111111111\n");
            printf("[do_search]msg.type = %d\n", msg->type);
            printf("[do_search]msg.name = %s\n", msg->name);
            printf("[do_search]msg.data = %s\n", msg->data);
            if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
            {
                perror("send error");
                exit(-1);
            }
            return 0;
        }
    }
    printf("[strncmp]msg.name = %s\n", msg->name);
    printf("[strncmp]buff=%s\n", buff);
    p = buff;
    p += word_len;
    if (*p != ' ')
    {
        // printf("22222222222\n");
        strcpy(msg->name, "NO_WORLD");
        printf("[do_search]msg.type = %d\n", msg->type);
        printf("[do_search]msg.name = %s\n", msg->name);
        printf("[do_search]msg.data = %s\n", msg->data);
        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        return 0;
    }
    while (*p == ' ')
    {
        p++;
    }
    strcpy(msg->name, "OK");
    strcpy(msg->data, p);
    printf("[do_search]msg.type = %d\n", msg->type);
    printf("[do_search]msg.name = %s\n", msg->name);
    printf("[do_search]msg.data = %s\n", msg->data);
    if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    fclose(fp);
    return 1;
}

void do_regist(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    char sqlstr[512] = {0};
    char *errmsg;
    printf("[msg]msg.type = %d\n", msg->type);
    printf("[msg]msg.name = %s\n", msg->name);
    printf("[msg]msg.data = %s\n", msg->data);
    sprintf(sqlstr, "insert into user values('%s','%s')", msg->name, msg->data);
    printf("[do_regist]sqlstr = %s\n", sqlstr);
    if (sqlite3_exec(my_db, sqlstr, NULL, NULL, &errmsg) != SQLITE_OK)
    {
        printf("errmsg = %s\n", errmsg);
        strcpy(msg->data, "user already exit,regist fail");
    }
    else
    {
        strcpy(msg->data, "OK");
    }
    printf("[do_regist_send]msg.type = %d\n", msg->type);
    printf("[do_regist_send]msg.name = %s\n", msg->name);
    printf("[do_regist_send]msg.data = %s\n", msg->data);
    if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    return;
}
// int callback(void *arg, int ncolumn, char **f_value, char **f_name)
// {
//     int i = 0;
//     int flag = 0;
//     msg_t *msg_callback = (msg_t *)arg;
//     printf("[msg_callbackmsg_callback.type = %d\n", msg_callback->type);
//     printf("[msg_callback]msg_callback.name = %s\n", msg_callback->name);
//     printf("[msg_callback]msg_callback.data = %s\n", msg_callback->data);
//     if (0 == flag)
//     {
//         // 先打印字段名
//         for (i = 0; i < ncolumn; i++)
//         {
//             // strcpy(msg_callback->data, "user or passwd ereror");
//             printf("\n");
//         }
//         flag = 1;
//     }
//     // 再打印字段的值
//     for (i = 0; i < ncolumn; i++)
//     {
//         if ((f_value[i] != msg_callback->name) || (f_value[i] != msg_callback->data))
//         {
//             strcpy(msg_callback->data, "user or passwd ereror");
//         }
//         else
//         {
//             strcpy(msg_callback->data, "OK");
//         }
//     }
//     return 0; // 这里的回调函数要求必须有返回值 如果没有会报错 query aborted
// }

int do_login(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    char sqlstr[512] = {0};
    printf("[msg]msg.type = %d\n", msg->type);
    printf("[msg]msg.name = %s\n", msg->name);
    printf("[msg]msg.data = %s\n", msg->data);
    sprintf(sqlstr, "select * from user where name='%s' and passwd='%s'", msg->name, msg->data);
    printf("[do_login]sqlstr = %s\n", sqlstr);
    char *errmsg, **result;
    int nrow, ncolumn;
    // 通过sqlite3_get_table函数查询记录是否存在
    sprintf(sqlstr, "select * from user where name = '%s' and passwd = '%s'", msg->name, msg->data);
    if (sqlite3_get_table(my_db, sqlstr, &result, &nrow, &ncolumn, &errmsg) != SQLITE_OK)
    {
        printf("error : %s\n", errmsg);
    }
    // 通过nrow参数判断是否能够查询到疾记录，如果值为0，则查询不到，如果值为非0，则查询到
    if (nrow == 0)
    {
        strcpy(msg->data, "user or passwd ereror");
        printf("[do_login_send]msg.type = %d\n", msg->type);
        printf("[do_login_send]msg.name = %s\n", msg->name);
        printf("[do_login_send]msg.data = %s\n", msg->data);
        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        return 0;
    }
    else
    {
        strncpy(msg->data, "OK", 256);
        printf("[do_login_send]msg.type = %d\n", msg->type);
        printf("[do_login_send]msg.name = %s\n", msg->name);
        printf("[do_login_send]msg.data = %s\n", msg->data);

        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        return 1;
    }
}
void do_quit(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    exit(-1);
}

client.c

#include <head.h>
#include <sqlite3.h> //sqlite3
#define R 1
#define L 2
#define Q 3
#define S 4
#define H 5
#define E 6
#define DATABASE "test.db"
#define FILEPATH "./dict.txt"
typedef struct _MSG
{
    int type;
    char name[256];
    char data[128];
} msg_t;
void print_menu();
int login_user(msg_t *msg, int sockfd, sqlite3 *my_db);
void exit_system(msg_t *msg, int sockfd);
int regist_user(msg_t *msg, int sockfd);
int check_user(msg_t msg, int sockfd);
int search_world(msg_t *msg, int sockfd, sqlite3 *my_db);
int exit_search(msg_t *msg, int sockfd);
void query_menu();
int main(int argc, const char *argv[])
{
    // 入参合理性检查
    if (3 != argc)
    {
        printf("usage error:%s <ip> <port>\n", argv[1]);
        exit(-1);
    }
    // 创建套接字
    sqlite3 *my_db;
    if (SQLITE_OK != sqlite3_open(DATABASE, &my_db))
    {
        printf("sqlite3 open error:%s\n", sqlite3_errmsg(my_db));
        exit(-1);
    }

    int sockfd;
    if (-1 == (sockfd = socket(AF_INET, SOCK_STREAM, 0)))
    {
        perror("socket error");
        exit(-1);
    }

    // 填充服务器网络信息结构体
    struct sockaddr_in serveraddr;
    socklen_t serveraddr_len = sizeof(serveraddr);
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
    serveraddr.sin_port = htons(atoi(argv[2]));
    int choose = 0;
    msg_t msg;
    if (-1 == connect(sockfd, (struct sockaddr *)&serveraddr, serveraddr_len))
    {
        perror("connect error");
        exit(-1);
    }
    printf("连接服务器成功...\n");
NEXT2:
    while (1)
    {

        print_menu();

        printf("请输入您的选择(1-3):");
        scanf("%d", &choose);

        switch (choose)
        {
        case R:
            regist_user(&msg, sockfd);
            break;
        case L:
            if (login_user(&msg, sockfd, my_db) == 1)
            {
                goto NEXT;
            }
            break;
        case Q:
            close(sockfd);
            // system("clear");
            printf("欢迎下次使用基于TCP的在线词典系统...\n");
            exit(0);
        }
    }
NEXT:
    while (1)
    {
        // system("clear");
        query_menu();
        printf("请输入您的选择(4-6):");
        scanf("%d", &choose);
        switch (choose)
        {
        case S:
            search_world(&msg, sockfd, my_db);
            break;
        case H:
            break;
        case E:
            goto NEXT2;
            break;
        }
    }

    return 0;
}
void print_menu()
{
    printf("-------------------------------------\n");
    printf("|  1.regist     2.login     3.quit  |\n");
    printf("-------------------------------------\n");
    return;
}
void query_menu()
{
    printf("-------------------------------------\n");
    printf("|  4.search    5.history    6.quit  |\n");
    printf("-------------------------------------\n");
    return;
}
void exit_system(msg_t *msg, int sockfd)
{
    system("clear");
    msg->type = Q;
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    close(sockfd);
    printf("欢迎下次使用基于TCP的在线词典系统...\n");
    exit(-1);
}
int regist_user(msg_t *msg, int sockfd)
{
    memset(msg, 0, sizeof(msg_t));
    msg->type = R;
    printf("[注册]请输入用户名:");
    scanf("%s", msg->name);
    printf("[注册]请输入密码:");
    scanf("%s", msg->data);
    // printf("[regist_user]msg.type = %d\n", msg->type);
    // printf("[regist_user]msg.name = %s\n", msg->name);
    // printf("[regist_user]msg.data = %s\n", msg->data);
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    // printf("[regist_send]msg.type = %d\n", msg->type);
    // printf("[regist_send]msg.name = %s\n", msg->name);
    // printf("[regist_send]msg.data = %s\n", msg->data);
    memset(msg, 0, sizeof(msg));
    if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("recv error");
        exit(-1);
    }
    // printf("[regist_recv]msg.type = %d\n", msg->type);
    // printf("[regist_recv]msg.name = %s\n", msg->name);
    // printf("[regist_recv]msg.data = %s\n", msg->data);
    if (strcmp(msg->data, "OK") == 0)
    {
        printf("注册成功...\n");
        return 1;
    }
    printf("用户名已存在，注册失败...\n");
    return 0;
}
int login_user(msg_t *msg, int sockfd, sqlite3 *my_db)
{
    memset(msg, 0, sizeof(msg_t));
    msg->type = L;
    printf("[登录]请输入用户名:");
    scanf("%s", msg->name);
    printf("[登录]请输入密码:");
    scanf("%s", msg->data);
    // printf("[login_user]msg.type = %d\n", msg->type);
    // printf("[login_user]msg.name = %s\n", msg->name);
    // printf("[login_user]msg.data = %s\n", msg->data);
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        return -1;
    }
    // printf("[login_user_send]msg.type = %d\n", msg->type);
    // printf("[login_user_send]msg.name = %s\n", msg->name);
    // printf("[login_user_send]msg.data = %s\n", msg->data);
    // memset(msg, 0, sizeof(msg_t));
    if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("recv error");
        return -1;
    }
    // printf("[login_user_recv]msg.type = %d\n", msg->type);
    // printf("[login_user_recv]msg.name = %s\n", msg->name);
    // printf("[login_user_recv]msg.data = %s\n", msg->data);

    if (strcmp(msg->data, "OK") == 0)
    {
        printf("登录成功...\n");
        return 1;
    }
    printf("用户名或密码错误...\n");
    return 0;
}
// int exit_search(msg_t *msg, int sockfd)
// {
//     return 0;
// }
int search_world(msg_t *msg, int sockfd, sqlite3 *my_db)
{

    // msg->type = S;
    while (1)
    {
        memset(msg, 0, sizeof(msg_t));
        msg->type = S;
        printf("[查询]请输入要查询的单词(按#退出):");
        scanf("%s", msg->name);
        if (msg->name[strlen(msg->name) - 1] == '\n')
        {
            msg->name[strlen(msg->name) - 1] = '\0';
        }
        // printf("[scanf]msg->name = %s\n", msg->name);
        if (strcmp(msg->name, "#") == 0)
        {
            printf("你主动退出了查单词功能...\n");
            break;
        }
        // printf("[do_search_send]msg.type = %d\n", msg->type);
        // printf("[do_search_send]msg.name = %s\n", msg->name);
        // printf("[do_search_send]msg.data = %s\n", msg->data);
        if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        memset(msg, 0, sizeof(msg));

        if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
        {
            perror("recv error");
            exit(-1);
        }
        // printf("[do_search_recv]msg.type = %d\n", msg->type);
        // printf("[do_search_recv]msg.name = %s\n", msg->name);
        // printf("[do_search_recv]msg.data = %s\n", msg->data);
        if (strncmp(msg->name, "OK", 3) == 0)
        {
            printf("[*****解释*****]:%s", msg->data);
        }
        else if (strncmp(msg->name, "NO_WORLD", 8) == 0)
        {
            printf("[*****没有此单词*****]...\n");
        }
    }
    return 0;
}

int check_user(msg_t msg, int sockfd)
{
    // printf("[check_user_send]msg.type = %d\n", msg.type);
    // printf("[check_user_send]msg.name = %s\n", msg.name);
    // printf("[check_user_send]msg.data = %s\n", msg.data);
    if (-1 == send(sockfd, &msg, sizeof(msg), 0))
    {
        perror("send error");
        exit(-1);
    }
    memset(&msg, 0, sizeof(msg));
    if (-1 == recv(sockfd, &msg, sizeof(msg), 0))
    {
        perror("recv error");
        exit(-1);
    }
    // printf("[check_user_recv]msg.type = %d\n", msg.type);
    // printf("[check_user_recv]msg.name = %s\n", msg.name);
    // printf("[check_user_recv]msg.data = %s\n", msg.data);
    if (strcmp(msg.data, "user already exit,regist fail") == 0)
    {
        return -1;
    }
    else
    {
        return 0;
    }
}

结果图

3.5 完成记录查询功能（history）

service.c

#include <head.h>
#include <sqlite3.h> //sqlite3
#define R 1
#define L 2
#define Q 3
#define S 4
#define H 5
#define E 6
#define DATABASE "test.db"
#define FILEPATH "./dict.txt"
typedef struct _MSG
{
    int type;
    char name[256];
    char data[128];
} msg_t;
void do_regist(msg_t *msg, int acceptfd, sqlite3 *my_db);
void do_quit(msg_t *msg, int acceptfd, sqlite3 *my_db);
int do_login(msg_t *msg, int acceptfd, sqlite3 *my_db);
int do_search(msg_t *msg, int acceptfd, sqlite3 *my_db, FILE *fp);
void getdata(char *data);
int history_callback(void *arg, int f_num, char **f_value, char **f_name);
void do_history(msg_t *msg, int acceptfd, sqlite3 *my_db);
int flafs = 0; // 全局变量 使得系统只有在第一次查询时 打开一次文件，第二次不用再打开
int main(int argc, const char *argv[])
{
    // 入参合理性检查
    if (3 != argc)
    {
        printf("usage error:%s <port> <ip>\n", argv[0]);
        exit(-1);
    }
    // 创建数据库
    sqlite3 *my_db;
    if (SQLITE_OK != sqlite3_open(DATABASE, &my_db))
    {
        printf("sqlite3 open error:%s\n", sqlite3_errmsg(my_db));
        exit(-1);
    }

    FILE *fp; // 传入do_search();
    // 创建套接字
    int sockfd;
    struct sockaddr_in serveraddr;
    memset(&serveraddr, 0, sizeof(serveraddr));
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
    {
        perror("sockfd error");
        exit(-1);
    }
    // 填充服务器网络信息结构体
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_port = htons(atoi(argv[2]));
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
    socklen_t serveraddr_len = sizeof(serveraddr);
    struct sockaddr_in clientaddr;
    socklen_t clientaddr_len = sizeof(clientaddr);
    memset(&clientaddr, 0, sizeof(clientaddr));
    // 绑定
    if (-1 == bind(sockfd, (struct sockaddr *)&serveraddr, serveraddr_len))
    {
        perror("bind error");
        exit(-1);
    }
    // 监听
    printf("%d\n", sockfd);
    if (listen(sockfd, 5) < 0)
    {
        perror("fail to listen");
        exit(-1);
    }
    int acceptfd;
    msg_t msg;
    while (1)
    {
        acceptfd = 0;
        printf("阻塞等待客户端连接...\n");
        if (-1 == (acceptfd = accept(sockfd, (struct sockaddr *)&clientaddr, &clientaddr_len)))
        {
            perror("accept errror");
            exit(-1);
        }
        printf("111111111\n");
        printf("客户端[%s][%d]连接成功...\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
        pid_t pid;
        pid = fork();
        if (pid == -1)
        {
            perror("fork error");
            exit(-1);
        }
        else if (pid == 0)
        {
            while (1)
            {
                if (-1 == recv(acceptfd, &msg, sizeof(msg), 0))
                {
                    perror("recv error");
                    exit(-1);
                }
                printf("[main]msg_type = %d\n", msg.type);
                printf("[main]msg.name = %s\n", msg.name);
                printf("[main]msg.data = %s\n", msg.data);
                switch (msg.type)
                {
                case R:
                    do_regist(&msg, acceptfd, my_db);
                    break;
                case L:
                    do_login(&msg, acceptfd, my_db);
                    break;
                case Q:
                    printf("客户端[%s][%d]退出了...\n", inet_ntoa(clientaddr.sin_addr), ntohs(clientaddr.sin_port));
                    do_quit(&msg, acceptfd, my_db);
                    break;
                case S:
                    do_search(&msg, acceptfd, my_db, fp);
                    break;
                case H:
                    do_history(&msg, acceptfd, my_db);
                    break;
                case E:

                    break;
                }
            }
            // 子进程
        }
        else
        {
            // 父进程
            close(acceptfd);
            wait(NULL);
        }
    }

    return 0;
}
void getdata(char *data)
{
    time_t t;
    struct tm *tp;
    time(&t);
    tp = localtime(&t);
    sprintf(data, "%d-%d-%d %d:%d:%d", 1900 + tp->tm_year, 1 + tp->tm_mon, tp->tm_mday,
            tp->tm_hour, tp->tm_min, tp->tm_sec);
}
void do_history(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    char databuff[128] = {0};
    getdata(databuff);
    printf("[do_history]msg.type = %d\n", msg->type);
    printf("[do_history]msg.name = %s\n", msg->name);
    printf("[do_history]msg.data = %s\n", msg->data);
    msg->type = H;
    char sqlbuff[512] = {0};
    sprintf(sqlbuff, "select * from record where  name='%s'", msg->name);
    if (sqlite3_exec(my_db, sqlbuff, history_callback, (void *)&acceptfd, NULL) != SQLITE_OK)
    {
        printf("do_history sqlite3_exec error");
    }
    strcpy(msg->data, "***OVER***");
    send(acceptfd, msg, sizeof(msg_t), 0);
    return;
}
int history_callback(void *arg, int f_num, char **f_value, char **f_name)
{
    int acceptfd_1;
    msg_t msg;
    acceptfd_1 = *(int *)arg;
    sprintf(msg.data, "%s:%s", f_value[0], f_value[2]);
    send(acceptfd_1, &msg, sizeof(msg_t), 0);
    return 0;
}

int do_search(msg_t *msg, int acceptfd, sqlite3 *my_db, FILE *fp)
{
    char buff[256] = {0};
    char databuff[128] = {0};
    getdata(databuff);
    printf("要查询的单词为:%s\n", msg->data);
    char sqlbuff[512] = {0};
    sprintf(sqlbuff, "insert into record values('%s','%s','%s')", databuff, msg->name, msg->data);
    printf("sqlbuff = %s\n", sqlbuff);
    if (sqlite3_exec(my_db, sqlbuff, NULL, NULL, NULL) != SQLITE_OK)
    {
        printf("do_search sqlite3_exec error\n");
        return -1;
    }
    int word_len = 0;
    char *p = NULL;
    word_len = strlen(msg->data);
    printf("要查询的单词%s的长度%d\n", msg->data, word_len);
    // if (flafs == 0)
    // {
    // printf("第一次查询,单词文件打开中...\n");
    if (NULL == (fp = fopen(FILEPATH, "r")))
    {
        printf("[第一次]打开单词文件失败...\n");
        strcpy(msg->data, "open error or EOF");
        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
    }
    p = NULL;
    fgets(buff, sizeof(buff), fp);
    while (strncmp(msg->data, buff, word_len) != 0)
    {
        if (fgets(buff, sizeof(buff), fp) == NULL)
        {
            strcpy(msg->data, "NO_WORLD");
            // printf("11111111111111111\n");
            printf("[do_search]msg.type = %d\n", msg->type);
            printf("[do_search]msg.name = %s\n", msg->name);
            printf("[do_search]msg.data = %s\n", msg->data);
            if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
            {
                perror("send error");
                exit(-1);
            }
            return 0;
        }
    }
    printf("[strncmp]msg.data = %s\n", msg->data);
    printf("[strncmp]buff=%s\n", buff);
    p = buff;
    p += word_len;
    if (*p != ' ')
    {
        // printf("22222222222\n");
        strcpy(msg->data, "NO_WORLD");
        printf("[do_search]msg.type = %d\n", msg->type);
        printf("[do_search]msg.name = %s\n", msg->name);
        printf("[do_search]msg.data = %s\n", msg->data);
        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        return 0;
    }
    while (*p == ' ')
    {
        p++;
    }
    strcpy(msg->data, p);
    printf("[do_search]msg.type = %d\n", msg->type);
    printf("[do_search]msg.name = %s\n", msg->name);
    printf("[do_search]msg.data = %s\n", msg->data);
    if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    fclose(fp);
    return 1;
}

void do_regist(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    char sqlstr[512] = {0};
    char *errmsg;
    printf("[msg]msg.type = %d\n", msg->type);
    printf("[msg]msg.name = %s\n", msg->name);
    printf("[msg]msg.data = %s\n", msg->data);
    sprintf(sqlstr, "insert into user values('%s','%s')", msg->name, msg->data);
    printf("[do_regist]sqlstr = %s\n", sqlstr);
    if (sqlite3_exec(my_db, sqlstr, NULL, NULL, &errmsg) != SQLITE_OK)
    {
        printf("errmsg = %s\n", errmsg);
        strcpy(msg->data, "user already exit,regist fail");
    }
    else
    {
        strcpy(msg->data, "OK");
    }
    printf("[do_regist_send]msg.type = %d\n", msg->type);
    printf("[do_regist_send]msg.name = %s\n", msg->name);
    printf("[do_regist_send]msg.data = %s\n", msg->data);
    if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    return;
}
// int callback(void *arg, int ncolumn, char **f_value, char **f_name)
// {
//     int i = 0;
//     int flag = 0;
//     msg_t *msg_callback = (msg_t *)arg;
//     printf("[msg_callbackmsg_callback.type = %d\n", msg_callback->type);
//     printf("[msg_callback]msg_callback.name = %s\n", msg_callback->name);
//     printf("[msg_callback]msg_callback.data = %s\n", msg_callback->data);
//     if (0 == flag)
//     {
//         // 先打印字段名
//         for (i = 0; i < ncolumn; i++)
//         {
//             // strcpy(msg_callback->data, "user or passwd ereror");
//             printf("\n");
//         }
//         flag = 1;
//     }
//     // 再打印字段的值
//     for (i = 0; i < ncolumn; i++)
//     {
//         if ((f_value[i] != msg_callback->name) || (f_value[i] != msg_callback->data))
//         {
//             strcpy(msg_callback->data, "user or passwd ereror");
//         }
//         else
//         {
//             strcpy(msg_callback->data, "OK");
//         }
//     }
//     return 0; // 这里的回调函数要求必须有返回值 如果没有会报错 query aborted
// }

int do_login(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    char sqlstr[512] = {0};
    printf("[msg]msg.type = %d\n", msg->type);
    printf("[msg]msg.name = %s\n", msg->name);
    printf("[msg]msg.data = %s\n", msg->data);
    sprintf(sqlstr, "select * from user where name='%s' and passwd='%s'", msg->name, msg->data);
    printf("[do_login]sqlstr = %s\n", sqlstr);
    char *errmsg, **result;
    int nrow, ncolumn;
    // 通过sqlite3_get_table函数查询记录是否存在
    sprintf(sqlstr, "select * from user where name = '%s' and passwd = '%s'", msg->name, msg->data);
    if (sqlite3_get_table(my_db, sqlstr, &result, &nrow, &ncolumn, &errmsg) != SQLITE_OK)
    {
        printf("error : %s\n", errmsg);
    }
    // 通过nrow参数判断是否能够查询到疾记录，如果值为0，则查询不到，如果值为非0，则查询到
    if (nrow == 0)
    {
        strcpy(msg->data, "user or passwd ereror");
        printf("[do_login_send]msg.type = %d\n", msg->type);
        printf("[do_login_send]msg.name = %s\n", msg->name);
        printf("[do_login_send]msg.data = %s\n", msg->data);
        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        return 0;
    }
    else
    {
        strncpy(msg->data, "OK", 256);
        printf("[do_login_send]msg.type = %d\n", msg->type);
        printf("[do_login_send]msg.name = %s\n", msg->name);
        printf("[do_login_send]msg.data = %s\n", msg->data);

        if (-1 == send(acceptfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        return 1;
    }
}
void do_quit(msg_t *msg, int acceptfd, sqlite3 *my_db)
{
    exit(-1);
}

client.c

#include <head.h>
#include <sqlite3.h> //sqlite3
#define R 1
#define L 2
#define Q 3
#define S 4
#define H 5
#define E 6
#define DATABASE "test.db"
#define FILEPATH "./dict.txt"
typedef struct _MSG
{
    int type;
    char name[256];
    char data[128];
} msg_t;
void print_menu();
int login_user(msg_t *msg, int sockfd, sqlite3 *my_db);
void exit_system(msg_t *msg, int sockfd);
int regist_user(msg_t *msg, int sockfd);
int check_user(msg_t msg, int sockfd);
int search_world(msg_t *msg, int sockfd, sqlite3 *my_db);
int exit_search(msg_t *msg, int sockfd);
void query_menu();
int printf_history(msg_t *msg, int sockfd, sqlite3 *my_db);
int main(int argc, const char *argv[])
{
    // 入参合理性检查
    if (3 != argc)
    {
        printf("usage error:%s <ip> <port>\n", argv[1]);
        exit(-1);
    }
    // 创建套接字
    sqlite3 *my_db;
    if (SQLITE_OK != sqlite3_open(DATABASE, &my_db))
    {
        printf("sqlite3 open error:%s\n", sqlite3_errmsg(my_db));
        exit(-1);
    }

    int sockfd;
    if (-1 == (sockfd = socket(AF_INET, SOCK_STREAM, 0)))
    {
        perror("socket error");
        exit(-1);
    }

    // 填充服务器网络信息结构体
    struct sockaddr_in serveraddr;
    socklen_t serveraddr_len = sizeof(serveraddr);
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
    serveraddr.sin_port = htons(atoi(argv[2]));
    int choose = 0;
    msg_t msg;
    if (-1 == connect(sockfd, (struct sockaddr *)&serveraddr, serveraddr_len))
    {
        perror("connect error");
        exit(-1);
    }
    printf("连接服务器成功...\n");
NEXT2:
    while (1)
    {

        print_menu();

        printf("请输入您的选择(1-3):");
        scanf("%d", &choose);

        switch (choose)
        {
        case R:
            regist_user(&msg, sockfd);
            break;
        case L:
            if (login_user(&msg, sockfd, my_db) == 1)
            {
                goto NEXT;
            }
            break;
        case Q:
            close(sockfd);
            // system("clear");
            printf("欢迎下次使用基于TCP的在线词典系统...\n");
            exit(0);
        }
    }
NEXT:
    while (1)
    {
        // system("clear");
        query_menu();
        printf("请输入您的选择(4-6):");
        scanf("%d", &choose);
        switch (choose)
        {
        case S:
            search_world(&msg, sockfd, my_db);
            break;
        case H:
            printf_history(&msg, sockfd, my_db);
            break;
        case E:
            goto NEXT2;
            break;
        }
    }

    return 0;
}
void print_menu()
{
    printf("-------------------------------------\n");
    printf("|  1.regist     2.login     3.quit  |\n");
    printf("-------------------------------------\n");
    return;
}
void query_menu()
{
    printf("-------------------------------------\n");
    printf("|  4.search    5.history    6.quit  |\n");
    printf("-------------------------------------\n");
    return;
}
void exit_system(msg_t *msg, int sockfd)
{
    system("clear");
    msg->type = Q;
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    close(sockfd);
    printf("欢迎下次使用基于TCP的在线词典系统...\n");
    exit(-1);
}

int printf_history(msg_t *msg, int sockfd, sqlite3 *my_db)
{
    // memset(msg, 0, sizeof(msg_t));
    // printf("[printf_history]msg.type = %d\n", msg->type);
    // printf("[printf_history]msg.name = %s\n", msg->name); // 单词
    // printf("[printf_history]msg.data = %s\n", msg->data); // OK
    msg->type = H;
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        return -1;
    }
    printf("<---历史记录如下--->\n");
    while (1)
    {
        if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
        {
            perror("recv error");
            exit(-1);
        }
        if (strcmp(msg->data, "***OVER***") == 0)
        {
            break;
        }
        printf("%s\n", msg->data);
    }
    return 0;
}
int regist_user(msg_t *msg, int sockfd)
{
    memset(msg, 0, sizeof(msg_t));
    msg->type = R;
    printf("[注册]请输入用户名:");
    scanf("%s", msg->name);
    printf("[注册]请输入密码:");
    scanf("%s", msg->data);
    // printf("[regist_user]msg.type = %d\n", msg->type);
    // printf("[regist_user]msg.name = %s\n", msg->name);
    // printf("[regist_user]msg.data = %s\n", msg->data);
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        exit(-1);
    }
    // printf("[regist_send]msg.type = %d\n", msg->type);
    // printf("[regist_send]msg.name = %s\n", msg->name);
    // printf("[regist_send]msg.data = %s\n", msg->data);
    memset(msg, 0, sizeof(msg));
    if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("recv error");
        exit(-1);
    }
    // printf("[regist_recv]msg.type = %d\n", msg->type);
    // printf("[regist_recv]msg.name = %s\n", msg->name);
    // printf("[regist_recv]msg.data = %s\n", msg->data);
    if (strcmp(msg->data, "OK") == 0)
    {
        printf("注册成功...\n");
        return 1;
    }
    printf("用户名已存在，注册失败...\n");
    return 0;
}
int login_user(msg_t *msg, int sockfd, sqlite3 *my_db)
{
    memset(msg, 0, sizeof(msg_t));
    msg->type = L;
    printf("[登录]请输入用户名:");
    scanf("%s", msg->name);
    printf("[登录]请输入密码:");
    scanf("%s", msg->data);
    // printf("[login_user]msg.type = %d\n", msg->type);
    // printf("[login_user]msg.name = %s\n", msg->name);
    // printf("[login_user]msg.data = %s\n", msg->data);
    if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("send error");
        return -1;
    }
    // printf("[login_user_send]msg.type = %d\n", msg->type);
    // printf("[login_user_send]msg.name = %s\n", msg->name);
    // printf("[login_user_send]msg.data = %s\n", msg->data);
    // memset(msg, 0, sizeof(msg_t));
    if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
    {
        perror("recv error");
        return -1;
    }
    // printf("[login_user_recv]msg.type = %d\n", msg->type);
    // printf("[login_user_recv]msg.name = %s\n", msg->name);
    // printf("[login_user_recv]msg.data = %s\n", msg->data);

    if (strcmp(msg->data, "OK") == 0)
    {
        printf("登录成功...\n");
        return 1;
    }
    printf("用户名或密码错误...\n");
    return 0;
}
// int exit_search(msg_t *msg, int sockfd)
// {
//     return 0;
// }
int search_world(msg_t *msg, int sockfd, sqlite3 *my_db)
{

    // msg->type = S;
    while (1)
    {
        // memset(msg, 0, sizeof(msg_t));
        msg->type = S;
        printf("[查询]请输入要查询的单词(按#退出):");
        scanf("%s", msg->data);
        if (msg->data[strlen(msg->data) - 1] == '\n')
        {
            msg->data[strlen(msg->data) - 1] = '\0';
        }
        // printf("[scanf]msg->name = %s\n", msg->name);
        if (strcmp(msg->data, "#") == 0)
        {
            printf("你主动退出了查单词功能...\n");
            break;
        }
        // printf("[do_search_send]msg.type = %d\n", msg->type);
        // printf("[do_search_send]msg.name = %s\n", msg->name);
        // printf("[do_search_send]msg.data = %s\n", msg->data);
        if (-1 == send(sockfd, msg, sizeof(msg_t), 0))
        {
            perror("send error");
            exit(-1);
        }
        memset(msg, 0, sizeof(msg));

        if (-1 == recv(sockfd, msg, sizeof(msg_t), 0))
        {
            perror("recv error");
            exit(-1);
        }
        // printf("[do_search_recv]msg.type = %d\n", msg->type);
        // printf("[do_search_recv]msg.name = %s\n", msg->name);
        // printf("[do_search_recv]msg.data = %s\n", msg->data);
        if (strncmp(msg->data, "NO_WORLD", 8) == 0)
        {
            printf("[*****没有此单词*****]...\n");
            // return 0;
        }
        else
        {
            printf("[*****解释*****]:%s", msg->data);
        }
    }
    return 0;
}

int check_user(msg_t msg, int sockfd)
{
    // printf("[check_user_send]msg.type = %d\n", msg.type);
    // printf("[check_user_send]msg.name = %s\n", msg.name);
    // printf("[check_user_send]msg.data = %s\n", msg.data);
    if (-1 == send(sockfd, &msg, sizeof(msg), 0))
    {
        perror("send error");
        exit(-1);
    }
    memset(&msg, 0, sizeof(msg));
    if (-1 == recv(sockfd, &msg, sizeof(msg), 0))
    {
        perror("recv error");
        exit(-1);
    }
    // printf("[check_user_recv]msg.type = %d\n", msg.type);
    // printf("[check_user_recv]msg.name = %s\n", msg.name);
    // printf("[check_user_recv]msg.data = %s\n", msg.data);
    if (strcmp(msg.data, "user already exit,regist fail") == 0)
    {
        return -1;
    }
    else
    {
        return 0;
    }
}

结果图

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