#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();
}