QT Hello World 程序

#include <QtGui/QApplication>/*所有图形化程序都必须包含的头文件*/

#include "mainwindow.h"

#include <QPushButton>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);/*每个QApplication对象都必须有且只有一个 QApplication 对象*/

    QPushButton TestButton("Hello World !!");

    TestButton.show();

    QObject::connect(&TestButton,SIGNAL(clicked),&a, SLOT(quit()));

    return a.exec();

}