解决关于GDI+ Bitmap::FromHICON 图片变黑边的问题

miracle_chen — Mon, 21 Dec 2009 14:11:00 GMT

我之前用Bitmap::FromHICON来保存图标句柄到Png的时候，发现有alpha通道的图标的透明值会变成黑色，后来偶尔看到了一个.net的解决代码，我把它变成了c++,代码如下仅供参考。工具(vs2008,依赖类库GDI+)

1bool CGdiPlusHelper::SaveHIcon2PngFile(HICON hIcon, LPCTSTR lpszPicFileName)
2{
3 if (hIcon == NULL)
4 {
5  ASSERT(FALSE);
6  return false;
7 }
8
9 ICONINFO icInfo = { 0 };
10 if (!::GetIconInfo(hIcon, &icInfo))
11 {
12  ASSERT(FALSE);
13  return false;
14 }
15 BITMAP bitmap;
16 GetObject(icInfo.hbmColor, sizeof(BITMAP), &bitmap);
17
18 Bitmap* pBitmap = NULL;
19 Bitmap* pWrapBitmap = NULL;
20 if (bitmap.bmBitsPixel != 32)
21 {
22  pBitmap = Bitmap::FromHICON(hIcon);
23 }
24  else
25  {
26   pWrapBitmap = Bitmap::FromHBITMAP(icInfo.hbmColor, NULL);
27   BitmapData bitmapData;
28   Rect rcImage(0,0, pWrapBitmap->GetWidth(), pWrapBitmap->GetHeight());
29   pWrapBitmap->LockBits(&rcImage, ImageLockModeRead, pWrapBitmap->GetPixelFormat(), &bitmapData);
30
31   pBitmap = new Bitmap(bitmapData.Width, bitmapData.Height, bitmapData.Stride,
32       PixelFormat32bppARGB, (BYTE*)bitmapData.Scan0);
33  }
34
35 bool bRet = CGdiPlusHelper::SavePng(pBitmap, lpszPicFileName);
36 delete pBitmap;
37 if (pWrapBitmap)
38  delete pWrapBitmap;
39 DeleteObject(icInfo.hbmColor);
40 DeleteObject(icInfo.hbmMask);
41 return bRet;
42}
43

miracle_chen 2009-12-21 22:11 发表评论

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解决关于GDI+ Bitmap::FromHICON 图片变黑边的问题