my.cpp

qt类库是非微软类库

#include <stdlib.h>
#include "my.h"
MyMainWindow::MyMainWindow()
{
	OldValue=0;
    //colordlg->getColor(QColor(0,0,0));
	setGeometry(100,100,300,200);
    b1=new QPushButton("OPEN",this);
	b1->setGeometry(10,10,80,40);
	b1->setFont(QFont("Times",18,QFont::Bold));
	connect(b1,SIGNAL(clicked()),this,SLOT(MyQuit()));

	lcd=new QLCDNumber(2,this);
	lcd->setGeometry(100,10,190,180);

	slider=new QSlider(Vertical,this);
	slider->setGeometry(10,60,80,130);

	connect(slider,SIGNAL(valueChanged(int)),lcd,SLOT(display(int)));

}
MyMainWindow::MyQuit()
{
	mb=new QMessageBox("Process?","Do you want to process?",
 					QMessageBox::Critical,
 					QMessageBox::Ok|QMessageBox::Default,
 					QMessageBox::Cancel|QMessageBox::Escape,
 					0);
	mb->show();
	int i;
	i=mb->exec();
	if(i==QMessageBox::Accepted)
		mb->show();
}

void MyMainWindow::SetValue(int Value)
{
	if(OldValue!=Value)
		{
		OldValue=Value;
        emit YChangedValue(Value);
		}

}