效果:

核心代码:

#include "simpleapp.h"
#include "ui_simpleapp.h"
#include <QMessageBox>SimpleApp::SimpleApp(QWidget *parent): QMainWindow(parent), ui(new Ui::SimpleApp)
{ui->setupUi(this);
}SimpleApp::~SimpleApp()
{delete ui;
}void SimpleApp::on_btnExit_clicked()
{close();}// 此项目参考地址:
// https://www.youtube.com/watch?v=6FjOY28Nl5g&ab_channel=HelloC%26CPPByProgrammingKnowledgevoid SimpleApp::on_btnLongin_clicked()
{QString name = ui->usernameTxt->text();QString pass = ui->passwordTxt->text();if (name == "admin" && pass == "123") {QMessageBox::information(this, "Login", "账号密码都正确！");// 先隐藏登录窗口。hide();// 显示一个新的窗口。secDialog = new SecDialog(this);secDialog->show();} else {QMessageBox::warning(this, "Login", "账号或密码不正确！请检查！");}
}

完整项目已经上传， 免积分下载，https://download.csdn.net/download/waterHBO/89547456