qt MessageBOX 消息

void MessageBox::slotQuestion()
{
	switch(QMessageBox::question(this,"Question",tr("It's end of document,search from begin?"),
		QMessageBox::Ok|QMessageBox::Cancel,QMessageBox::Ok))
	{
	case QMessageBox::Ok:
		label->setText(" Question button / Ok ");
		break;
	case QMessageBox::Cancel:
		label->setText(" Question button / Cancel ");
		break;
	default:
		break;
	}
	return;
}

void MessageBox::slotInformation()
{
	QMessageBox::information(this,"Information",tr("anything you want tell user"));
	return;
}

void MessageBox::slotWarning()
{
	switch(QMessageBox::warning(this,"Warning",tr("Save changes to document?"),
		QMessageBox::Save|QMessageBox::Discard|QMessageBox::Cancel,QMessageBox::Save))
	{
	case QMessageBox::Save:
		label->setText(" Warning button / Save ");
		break;
	case QMessageBox::Discard:
		label->setText(" Warning button / Discard ");
		break;
	case QMessageBox::Cancel:
		label->setText(" Warning button / Cancel ");
		break;
	default:
		break;
	}
	return;

}

void MessageBox::slotCritical()
{
	QMessageBox::critical(this,"Critical",tr("tell user a critical error"));
	label->setText(" Critical MessageBox ");
	return;
}

void MessageBox::slotAbout()
{
	QMessageBox::about(this,"About",tr("Message box example!"));
	label->setText(" About MessageBox ");
	return;
}

void MessageBox::slotAboutQt()
{
	QMessageBox::aboutQt(this,"About Qt");
	label->setText(" About Qt MessageBox ");
	return;
}

void MessageBox::slotCustom()
{
	QMessageBox customMsgBox;
	customMsgBox.setWindowTitle("Custom message box");
	QPushButton *lockButton = customMsgBox.addButton(tr("Lock"),QMessageBox::ActionRole);
	QPushButton *unlockButton = customMsgBox.addButton(tr("Unlock"),QMessageBox::ActionRole);
	QPushButton *cancelButton = customMsgBox.addButton(QMessageBox::Cancel);
	customMsgBox.setIconPixmap(QPixmap(":/images/linuxredhat.png"));
	customMsgBox.setText(tr("This is a custom message box"));
	customMsgBox.exec();

	if(customMsgBox.clickedButton() == lockButton)
		label->setText(" Custom MessageBox / Lock ");
	if(customMsgBox.clickedButton() == unlockButton)
		label->setText(" Custom MessageBox / Unlock ");
	if(customMsgBox.clickedButton() == cancelButton)
		label->setText(" Custom MessageBox / Cancel ");

	return;
}

main.cpp

#include "messagebox.h"
#include <QtGui/QApplication>

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	MessageBox *w=new MessageBox;
	w->show();
	return a.exec();
}

效果图：