617作业

sec.h

public slots:
    void jump_solt();

widget.h

private slots:
    void on_pb_2_clicked();

    void on_pushButton_clicked();

signals:
    void my_jump();

sec.cpp

void SEC::jump_solt()
{
    this->show();
}

widget.cpp

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->setWindowFlag(Qt::FramelessWindowHint);
    this->setAttribute(Qt::WA_TranslucentBackground);
}

Widget::~Widget()
{
    delete ui;

}

void Widget::on_pb_2_clicked()
{
    this->close();
}

void Widget::on_pushButton_clicked()
{
    QString ID = ui->lineEdit->text();
    QString PD = ui->lineEdit_2->text();
    if( ID == "111" && PD == "111" )
    {
        this->close();
        emit my_jump();
    }
    else {
        QMessageBox::warning(this,"登录","登陆失败");
        ui->lineEdit->clear();
        ui->lineEdit_2->clear();
    }

mian.cpp

#include "widget.h"
#include "sec.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    SEC s;

    QObject::connect(&w,&Widget::my_jump,&s,&SEC::jump_solt);

   return a.exec();
}