9月10号的学习

//界面1 头文件
signals://界面1的自定义信号void my_signal();
private slots:void on_pushButton_2_clicked();void on_pushButton_clicked();
//界面1 .cpp文件
void Widget::on_pushButton_2_clicked()
{QMessageBox msg(QMessageBox::Warning,"警告","是否退出",QMessageBox::Yes| QMessageBox::No,this);int ret= msg.exec();if(ret==QMessageBox::Yes){this->close();}else{}
}void Widget::on_pushButton_clicked()
{if(ui->lineEdit->text()=="admin"&&ui->lineEdit_2->text()=="123456"){QMessageBox msg(QMessageBox::Warning,"提示","登录成功",QMessageBox::Yes,this);int ret= msg.exec();if(ret==QMessageBox::Yes){this->close();emit my_signal();}}else{QMessageBox msg(QMessageBox::Warning,"提示","账户密码输入错误",QMessageBox::No,this);int ret= msg.exec();if(ret==QMessageBox::No){ui->lineEdit->clear();ui->lineEdit_2->clear();}}
}
//主函数
#include "widget.h"
#include"talk.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;Talk t;QObject::connect(&w,&Widget::my_signal,&t,&Talk::my_slot);w.show();return a.exec();
}