Hi,

I'm coding a processviewer in windows, and due the necessity to convert HICON to Pixmap I've used a function of Qt sources, convertHIconToPixmap the problem is that application crashes, by debugging I've discovered that a QImage img presents a problem,

img <internal error> from Debugger Prompt

here the function

Qt Code: 
  1. QPixmap ProcessView::ConvertHTP(const HICON icon) const
  2. {
  3.     bool foundAlpha = false;
  4.     HDC screenDevice = qt_win_display_dc();
  5.     HDC hdc = CreateCompatibleDC(screenDevice);
  6.  
  7.  
  8.     ICONINFO iconinfo;
  9.     GetIconInfo(icon, &iconinfo); //x and y Hotspot describes the icon center
  10.  
  11.     BITMAPINFOHEADER bitmapInfo;
  12.     bitmapInfo.biSize        = sizeof(BITMAPINFOHEADER);
  13.     bitmapInfo.biWidth       = iconinfo.xHotspot * 2;
  14.     bitmapInfo.biHeight      = iconinfo.yHotspot * 2;
  15.     bitmapInfo.biPlanes      = 1;
  16.     bitmapInfo.biBitCount    = 32;
  17.     bitmapInfo.biCompression = BI_RGB;
  18.     bitmapInfo.biSizeImage   = 0;
  19.     bitmapInfo.biXPelsPerMeter = 0;
  20.     bitmapInfo.biYPelsPerMeter = 0;
  21.     bitmapInfo.biClrUsed       = 0;
  22.     bitmapInfo.biClrImportant  = 0;
  23.     DWORD* bits;
  24.  
  25.     HBITMAP winBitmap = CreateDIBSection(hdc, (BITMAPINFO*)&bitmapInfo, DIB_RGB_COLORS, (VOID**)&bits, NULL, 0);
  26.     HGDIOBJ oldhdc = (HBITMAP)SelectObject(hdc, winBitmap);
  27.     DrawIconEx( hdc, 0, 0, icon, iconinfo.xHotspot * 2, iconinfo.yHotspot * 2, 0, 0, DI_NORMAL);
  28.  
  29.     QPixmap::HBitmapFormat alphaType = QPixmap::PremultipliedAlpha;
  30.     QPixmap iconpixmap = QPixmap::fromWinHBITMAP(winBitmap, alphaType);
  31.     [B]QImage img = iconpixmap.toImage();[/B]  // PROBLEM HERE
  32.  
  33.     for (int y = 0 ; y < iconpixmap.height() && !foundAlpha ; y++) {
  34.         QRgb *scanLine= reinterpret_cast<QRgb *>(img.scanLine(y));
  35.         for (int x = 0; x < img.width() ; x++) {
  36.             if (qAlpha(scanLine[x]) != 0) {
  37.                 foundAlpha = true;
  38.                 break;
  39.             }
  40.         }
  41.     }
  42.  
  43.     if (!foundAlpha) {
  44.         //If no alpha was found, we use the mask to set alpha values
  45.         DrawIconEx( hdc, 0, 0, icon, iconinfo.xHotspot * 2, iconinfo.yHotspot * 2, 0, 0, DI_MASK);
  46.         QPixmap maskPixmap = QPixmap::fromWinHBITMAP(winBitmap, alphaType);
  47.         QImage mask = maskPixmap.toImage();
  48.  
  49.         for (int y = 0 ; y< iconpixmap.height() ; y++){
  50.             QRgb *scanlineImage = reinterpret_cast<QRgb *>(img.scanLine(y));
  51.             QRgb *scanlineMask = reinterpret_cast<QRgb *>(mask.scanLine(y));
  52.             for (int x = 0; x < img.width() ; x++){
  53.                 if (qRed(scanlineMask[x]) != 0)
  54.                     scanlineImage[x] = 0; //mask out this pixel
  55.                 else
  56.                     scanlineImage[x] |= 0xff000000; // set the alpha channel to 255
  57.             }
  58.         }
  59.     }
  60.  
  61.     //dispose resources created by iconinfo call
  62.     DeleteObject(iconinfo.hbmMask);
  63.     DeleteObject(iconinfo.hbmColor);
  64.  
  65.     SelectObject(hdc, oldhdc); //restore state
  66.     DeleteObject(winBitmap);
  67.     DeleteDC(hdc);
  68.     return QPixmap::fromImage(img);
  69. }
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how can be solved QImage img <internal error> ? thanks

Regards,
Giuseppe Bonfa'