main.cpp

一大堆的qt程序,在qte2.3.7下全部可以很好地运行

#include <qapplication.h>
#include <qlabel.h>
#include <qbuttongroup.h>
#include <qpushbutton.h>

int main( int argc, char **argv)
{
     QApplication app( argc, argv);
     QButtonGroup box;
     box.setGeometry(0,20,200,100);
 //    QLabel label("hello,world!",&box);
     QLabel *label = new QLabel("Hello,world!",0);
     label->setAlignment(Qt::AlignVCenter |Qt:: AlignHCenter);
     label->setGeometry(60,20,80,30);
     label->hide();
     QPushButton button1("h&ide",&box);
     button1.setGeometry(80,60,40,30);
 
     QPushButton button0("&show",&box);
     button0.setGeometry(20,60,40,30);

     QPushButton button2("e&xit",&box);
     button2.setGeometry(140,60,40,30);

     app.connect(&button0,SIGNAL(pressed()),label,SLOT(show()));
     app.connect(&button1,SIGNAL(clicked()),label,SLOT(hide()));
     app.connect(&button2,SIGNAL(released()),&app,SLOT(quit()));

     app.setMainWidget(&box);
     box.show();

     return app.exec();
}