counter.cpp

这是基于QT2.3.10的信号和槽的一个实例

#include <stdio.h>
#include "counter.h"

Counter::Counter( QWidget *parent, const char *name ):QWidget( parent, name )

{

 counter = 0;
 
 label = new QLabel( "0", this );

 label->setAlignment( AlignVCenter | AlignHCenter );

 }

void Counter::IncCounter()

{
 char str[30];

 sprintf( str, "%d", ++counter );

 label->setText( str );

}

void Counter::DecCounter()
{
 char str[30];
 
 sprintf( str,"%d", --counter );

 label->setText( str );

}