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有道云笔记

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        second.h     

#ifndef SECOND_H
#define SECOND_H#include <QWidget>namespace Ui {
class Second;
}class Second : public QWidget
{Q_OBJECTpublic:explicit Second(QWidget *parent = nullptr);~Second();
public slots:void my_jump_slot();
private:Ui::Second *ui;
};#endif // SECOND_H

        widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QMessageBox>namespace Ui {
class Widget;
}class Widget : public QWidget
{Q_OBJECTpublic:explicit Widget(QWidget *parent = nullptr);~Widget();
signals:void my_signal();private slots:void on_pushButton_clicked();void on_pushButton_2_clicked();private:Ui::Widget *ui;
};#endif // WIDGET_H

main.cpp

#include "widget.h"
#include "second.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;Second s;QObject::connect(&w,&Widget::my_signal,&s,&Second::my_jump_slot);w.show();return a.exec();
}

second.cpp

#include "second.h"
#include "ui_second.h"Second::Second(QWidget *parent) :QWidget(parent),ui(new Ui::Second)
{ui->setupUi(this);
}Second::~Second()
{delete ui;
}void Second::my_jump_slot()
{this->show();
}

widget.cpp

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget)
{ui->setupUi(this);this->setWindowIcon(QIcon(":/picture/pic1.jpg"));this->setWindowFlag(Qt::FramelessWindowHint);this->setAttribute(Qt::WA_TranslucentBackground);
}Widget::~Widget()
{delete ui;
}
//登录
void Widget::on_pushButton_clicked()
{if(ui->lineEdit->text()=="admin" && ui->lineEdit_2->text()=="123456"){int ret = QMessageBox::question(this,"文本框","登陆成功",QMessageBox::Ok);if(ret==QMessageBox::Ok){this->close();emit this->my_signal();}}else{QMessageBox msg(QMessageBox::Critical,"警告","账号密码有错,重新登录?",QMessageBox::Yes | QMessageBox::No);int res=msg.exec();if(res==QMessageBox::Yes){ui->lineEdit->clear();ui->lineEdit_2->clear();}else{this->close();}}
}
//取消
void Widget::on_pushButton_2_clicked()
{QMessageBox msg(QMessageBox::Question,"询问","是否确定退出?",QMessageBox::Yes | QMessageBox::No);int res=msg.exec();if(res==QMessageBox::Yes){this->close();}else{}}

登陆成功图