改变bitmap大小的函数

BOOL TranslateBitmapSize(
IN HDC hCurScreemDC,	//当前屏幕DC，可通过GetDC获得
IN HBITMAP hBmpSrc,	//原BITMAP句柄
IN int nSrcWidth,		//原BITMAP的宽度
IN int nSrcHeight,		//原BITMAP的高度
OUT HBITMAP &hBmpDst,	//改变大小后的BITMAP的句柄
IN int nDstWidth,		//改变大小后的BITMAP的宽度
IN int nDstHeight		//改变大小后的BITMAP的高度
)
{
if (hBmpSrc == NULL || hCurScreemDC == NULL)
{
return FALSE;
}
if (hBmpDst != NULL)
{
DeleteObject(hBmpDst);
}
HDC hOldSrcDC = NULL;
HDC hOldDstDC = NULL;
HDC hSrcDC = CreateCompatibleDC(hCurScreemDC);
HDC hDstDC = CreateCompatibleDC(hCurScreemDC);
hBmpDst = CreateCompatibleBitmap(hCurScreemDC,nDstWidth,nDstHeight);
hOldSrcDC = (HDC)SelectObject(hSrcDC,hBmpSrc);
hOldDstDC = (HDC)SelectObject(hDstDC,hBmpDst);
StretchBlt(hDstDC,0,0,nDstWidth,nDstHeight,hSrcDC,0,0,nSrcWidth,nSrcHeight,SRCCOPY);
SelectObject(hSrcDC,hOldSrcDC);
SelectObject(hDstDC,hOldDstDC);
DeleteObject(hSrcDC);
DeleteObject(hDstDC);
return TRUE;
}