I'm trying to create a QImage from a buffer, but it doesn't work. If I use setPixel() it works, but if I use a uchar buffer, the Image won't be drawn.

Any idea why?

Qt Code: 
  1. int imwidth = 4;
  2.                 int imheight = 16;
  3.  
  4.                  uchar BUF[] = { 
  5.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  6.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  7.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  8.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  9.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  10.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  11.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  12.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  13.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0,  
  14.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  15.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  16.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  17.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  18.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  19.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 
  20.                               255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0, 255, 255, 0, 0
  21.                     };
  22.  
  23.  
  24.                 QImage qi(BUF, imwidth, imheight, QImage::Format_ARGB32);    // doesn't work
  25.                 QRect s(0, 0, imwidth, imheight);
  26.                 painter->drawImage(s, qi, s, Qt::AutoColor);
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http://developer.qt.nokia.com/doc/qt-4.8/qimage.html