setMainWidget

[peace_comp]

Peace..
hey ..
I try to compile a simple qt programm whch I found in a tuto .. but I get the following error >> 'class QApplication' has no member named 'setMainWidget'

#include <QApplication.h>
#include <qpainter.h>
#include <qlabel.h>
#include <qpixmap.h>
#include <qpaintdevice.h>
void Dessiner(QPaintDevice * dev)
 { }
int main (int argc, char* argv[])
 { 
  QApplication app(argc, argv) ;
  QPixmap pix(300, 200) ;
   Dessiner(&pix) ;
   QLabel label(0) ;
   label.setPixmap(pix) ;
   app.setMainWidget(&label) ;
   label.show() ;
  return app.exec() ;
 }

#include <QApplication.h>
#include <qpainter.h>
#include <qlabel.h>
#include <qpixmap.h>
#include <qpaintdevice.h>
void Dessiner(QPaintDevice * dev)
 { }
int main (int argc, char* argv[])
 { 
  QApplication app(argc, argv) ;
  QPixmap pix(300, 200) ;
   Dessiner(&pix) ;
   QLabel label(0) ;
   label.setPixmap(pix) ;
   app.setMainWidget(&label) ;
   label.show() ;
  return app.exec() ;
 }

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so is setMainWidget a member of QApplication class ??
plz help