I get one live image from camera each time I call the function "vc3d_GetImage(0,iTotalImage,true,&iRemainImg, pB)". After that I will call the function "loadImage(unsigned char *pB)" to display the image. However the image is not updated all the while. Only the last image is showed at the end. For example I call the function "vc3d_GetImage(0,iTotalImage,true,&iRemainImg, pB)" 5 times. The display is not updated 5 times. The display is only updated once (the fifth image) at the end. What has I done wrong?

Qt Code: 
  1. void MainWindow::on_pBCapture_clicked()
  2. {
  3.     ui->lImageCount->setText("0");
  4.     int iTotalImage = ui->sBTotalImage->value();
  5.  
  6.     int iImgWidth, iImgHeight;
  7.     int count = 0;
  8.     unsigned char *pBuffer=NULL;
  9.     unsigned char *pBuffer2=NULL;
  10.  
  11.     /* to get the width and height of image */
  12.     int iStatus = vc3d_GetImageSizeVr(0, &iImgWidth, &iImgHeight);
  13.  
  14.     if (iStatus>0)
  15.     {
  16.         int iRemainImg = iTotalImage;
  17.         pBuffer = new unsigned char[iImgWidth*iImgHeight];
  18.         pBuffer2 = new unsigned char[iImgWidth*iImgHeight];
  19.         // Get one image (or more when in a loop)
  20.         do
  21.         {
  22.            unsigned char *pB;
  23.             if (iRemainImg%2)
  24.             {
  25.                 pB=pBuffer;
  26.             }
  27.             else
  28.             {
  29.                 pB=pBuffer2;
  30.             }
  31.             /* Get the one image when this function is called */
  32.             iStatus = vc3d_GetImage(0,iTotalImage,true,&iRemainImg, pB);
  33.             if (iStatus == 1)
  34.             {
  35.                 count++;
  36.                 ui->lImageCount->setText(QString::number(count));
  37.                 loadImage(pB);
  38.             }
  39.            //delete [] pBuffer;
  40.         }while (iRemainImg>0 && iStatus>0);
  41.     }
  42. }
  43.  
  44. void MainWindow::loadImage(unsigned char *pB)
  45. {
  46.     QGraphicsScene* scene = new QGraphicsScene(this);
  47.     ui->graphicsView->setScene(scene);
  48.     QImage image = QImage(pB, 1280, 1024, QImage::Format_Indexed8);
  49.     scene->clear();
  50.     QGraphicsPixmapItem* pi = scene->addPixmap(QPixmap::fromImage(image));
  51.     ui->graphicsView->fitInView(scene->sceneRect(), Qt::KeepAspectRatio);
  52.     ui->graphicsView->update();
  53.     ui->graphicsView->viewport()->update();
  54.     ui->graphicsView->show();
  55. }
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