GDI+图片保存

Bitmap bitmap(width,height,stride,PixelFormat32bppARGB,pData);
UINT num; 
UINT size;
ImageCodecInfo* pImageCodecInfo; 
GetImageEncodersSize(&num, &size); 
pImageCodecInfo = (ImageCodecInfo*)(malloc(size)); 
GetImageEncoders(num, size, pImageCodecInfo); 
for(int i=0;i

带alpha通道的png图片保存