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+)
1 bool 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
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