新建项目,基类选择QMainWindow,取消勾选ui
mainwindow.cpp代码:
#include "mainwindow.h" //头文件中引入 //#include <QMainWindow> //#include<QMenuBar> //#include<QMenu> //#include<QMessageBox> //消息对话框 //#include<QDebug> //#include<QFileDialog> //文件对话框 MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { resize(400,200); QMenuBar *mBar=menuBar();//菜单栏 QMenu *menu=mBar->addMenu("对话框");//菜单 QMenu *m1=menu->addMenu("消息对话框"); QAction *p11=m1->addAction("about对话框");//菜单项 QAction *p12=m1->addAction("question对话框"); QAction *p2=menu->addAction("文件对话框"); connect(p11,&QAction::triggered, [=](){ QMessageBox::about(this,"about标题","about对话框的内容"); }); connect(p12,&QAction::triggered, [=](){//自己指定按钮 int result=QMessageBox::question(this,"question标题","内容:你还好吗?",QMessageBox::Yes|QMessageBox::No); switch (result) { case QMessageBox::Yes: qDebug()<<"我很好"; break; case QMessageBox::No: qDebug()<<"不好"; break; default: break; } }); connect(p2,&QAction::triggered, [=](){ //文件对话框// QString fileName=QFileDialog::getOpenFileName(this,"打开","/home","Image(*.jpg *.png);;Text(*.txt);;all(*.*)"); qDebug()<<fileName; }); } MainWindow::~MainWindow() { }