AlphaBlend
The AlphaBlend function displays bitmaps that have transparent or semitransparent pixels.
AlphaBlend(
HDC hdcDest,
int nXOriginDest,
int nYOriginDest,
int nWidthDest,
int hHeightDest,
HDC hdcSrc,
int nXOriginSrc,
int nYOriginSrc,
int nWidthSrc,
int nHeightSrc,
BLENDFUNCTION blendFunction
);
很好用，，我在WindowsMobile使用都OK
