在用 FromHBITMAP 你会发现出来的图是带有黑边的,这是因为这个函数有个 bug,解决的办法是用下列的函数进行转换,大体意思就是自己 memcpy 不要用 FromHBITMAP 函数。
Bitmap* CreateBitmapFromHBITMAP(IN HBITMAP hBitmap)
{
BITMAP bmp = { 0 };
if ( 0 == GetObject(hBitmap, sizeof(BITMAP), (LPVOID)&bmp) )
{
return FALSE;
}
BYTE *piexlsSrc = NULL;
LONG cbSize = bmp.bmWidthBytes * bmp.bmHeight;
piexlsSrc = new BYTE[cbSize];
BITMAPINFO bmpInfo = { 0 };
bmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmpInfo.bmiHeader.biWidth = bmp.bmWidth;
bmpInfo.bmiHeader.biHeight = bmp.bmHeight;
bmpInfo.bmiHeader.biPlanes = bmp.bmPlanes;
bmpInfo.bmiHeader.biBitCount = bmp.bmBitsPixel;
bmpInfo.bmiHeader.biCompression = BI_RGB;
HDC hdcScreen = CreateDC(L"DISPLAY", NULL, NULL,NULL);
LONG cbCopied = GetDIBits(hdcScreen, hBitmap, 0,
bmp.bmHeight, piexlsSrc, &bmpInfo, DIB_RGB_COLORS);
DeleteDC(hdcScreen);
if ( 0 == cbCopied )
{
delete [] piexlsSrc;
return FALSE;
}
Bitmap *pBitmap = new Bitmap(bmp.bmWidth, bmp.bmHeight, PixelFormat32bppPARGB);
BitmapData bitmapData;
Rect rect(0, 0, bmp.bmWidth, bmp.bmHeight);
if ( Ok != pBitmap->LockBits(&rect, ImageLockModeRead,
PixelFormat32bppPARGB, &bitmapData) )
{
SAFE_DELETE(pBitmap);
return NULL;
}
BYTE *pixelsDest = (BYTE*)bitmapData.Scan0;
int nLinesize = bmp.bmWidth * sizeof(UINT);
int nHeight = bmp.bmHeight;
for ( int y = 0; y {
memcpy_s( (pixelsDest + y * nLinesize), nLinesize,
(piexlsSrc + (nHeight - y - 1) * nLinesize), nLinesize);
}
if ( Ok != pBitmap->UnlockBits(&bitmapData) )
{
delete pBitmap;
}
delete [] piexlsSrc;
return pBitmap;
}
https://groups.google.com/forum/#!topic/microsoft.public.win32.programmer.gdi/stjG06_EPfM