#include <QPushButton>

类QPushButton

命令按钮

 #include "mainwindow.h"
 #include <QApplication>

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

     QPushButton *p1=new QPushButton("ABC");
     p1->show();

     return a.exec();
 }