hi
how can i use QImage::scanLine() to compare pixel data of 2 images.
Qt Code: 
  1. QImage image("C:\\Documents and Settings\\All Users\\Documents\\My Pictures\\Sample Pictures\\Winter.jpg");
  2.     int height=image.height();
  3.     int width=image.width();
  4.     QImage image1("C:\\Documents and Settings\\All Users\\Documents\\My Pictures\\Sample Pictures\\Winter.jpg");
  5.     int height1=image1.height();
  6.     int width1=image1.width();
  7.  
  8.     if(height1!=height||width1!=width){
  9.     qDebug()<<"Images are different";
  10.     }
  11.     else
  12.     for(int i=0,j=0;i<height,j<height1;i++,j++){
  13.  
  14.         QRgb * img=(QRgb *)image.scanLine(i);
  15.         QRgb * img1=(QRgb *)image.scanLine(j);
  16.         if(*img==*img1){
  17.         qDebug()<<"images matched:";
  18.  
  19.         }
  20.         else
  21.             qDebug()<<"images do not match";
  22.     }
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i know this code is error prone, kindly explain to me how scanLine works

thanx