Windows下的TCP/IP实例

1.注意事项

windows下winsock.h/winsock2.h
linux下sys/socket.h
不同平台头文件不一样
#include <winsock.h> 或者 #include <winsock2.h>

2. 安装minGW

目标是在 Windows 环境下提供类似于 Unix/Linux 环境下的开发工具，使开发者能够轻松地在 Windows 上编写和编译 C、C++ 等程序。
安装参考链接

3. 代码

说明：只有一个电脑，创建进程测试的。代码保存成server.cpp，最后运行

g++ serve.cpp -lws2_32

serve.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>
#include <windows.h>

#pragma comment(lib, "ws2_32.lib")

#define PORT 8888
#define MAX_CONNECTIONS 5
//windows下winsock.h/winsock2.h 
//linux下sys/socket.h
//不同平台头文件不一样
//#include <winsock.h> 或者 #include <winsock2.h>
//<arpa/inet.h>用<windows.h>代替

DWORD WINAPI serverThread(LPVOID lpParam) {
    SOCKET serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    struct sockaddr_in serverAddr;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(PORT);
    serverAddr.sin_addr.s_addr = INADDR_ANY;

    bind(serverSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr));

    listen(serverSocket, MAX_CONNECTIONS);

    printf("Server listening on port %d\n", PORT);
	struct sockaddr_in clientAddr;
	int clientAddrLen = sizeof(clientAddr);

	SOCKET clientSocket = accept(serverSocket, (struct sockaddr*)&clientAddr, &clientAddrLen);
    while (1) {

        char buffer[1024] = {0};
        recv(clientSocket, buffer, 1024, 0);
        printf("Received message from client: %s\n", buffer);

        send(clientSocket, "Message received.\n", strlen("Message received"), 0);
        if (strcmp(buffer, "serve_exit\n") == 0) {
            break;
        }
        
    }
    closesocket(clientSocket);
    closesocket(serverSocket);

    return 0;
}

int main() {
    WSADATA wsaData;
    WSAStartup(MAKEWORD(2, 2), &wsaData);

    HANDLE serverThreadHandle = CreateThread(NULL, 0, serverThread, NULL, 0, NULL);

    Sleep(100); // 等待服务器线程启动

    SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, 0);

    struct sockaddr_in serverAddr;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(PORT);
    serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    connect(clientSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr));

    char message[1024];
    while (1) {
        printf("Enter message: ");
        fgets(message, 1024, stdin);
        send(clientSocket, message, strlen(message), 0);

        if (strcmp(message, "exit\n") == 0) {
            break;
        }

        char buffer[1024] = {0};
        recv(clientSocket, buffer, 1024, 0);
        printf("Server says: %s", buffer);
		
    }

    closesocket(clientSocket);
    CloseHandle(serverThreadHandle);

    WSACleanup();

    return 0;
}