my.cpp

qt类库是非微软类库

#include "my.h"
MyMainWindow::MyMainWindow()
{
    pb=new QPushButton("OPEN",this);
	pb->setGeometry(20,20,50,30);
	connect(pb,SIGNAL(clicked()),this,SLOT(MyHandle()));
}
void MyMainWindow::MyHandle()
{
  mb=new QMessageBox(
	  );
  int i=mb->exec();
  if(i==QMessageBox::Accepted)
	  mb->show();

}