Convert "HBITMAP" to "IplImage*"

hBitmap2Ipl.c

IplImage* hBitmap2Ipl(HBITMAP hBmp)
{
	BITMAP bmp;
	::GetObject(hBmp,sizeof(BITMAP),&bmp);
	
	// get channels which equal 1 2 3 or 4    
	// bmBitsPixel :   
	// Specifies the number of bits    
	// required to indicate the color of a pixel.
	int nChannels = bmp.bmBitsPixel == 1 ? 1 : bmp.bmBitsPixel/8 ;
	
	// get depth color bitmap or grayscale 
	int depth = bmp.bmBitsPixel == 1 ? IPL_DEPTH_1U : IPL_DEPTH_8U;
	
	IplImage* img = cvCreateImageHeader( cvSize(bmp.bmWidth, bmp.bmHeight), depth, nChannels );
	
	// Copy bitmap data to IplImage
	img->imageData =
		(char*)malloc(bmp.bmHeight*bmp.bmWidth*nChannels*sizeof(char));
	memcpy(img->imageData,(char*)(bmp.bmBits),bmp.bmHeight*bmp.bmWidth*nChannels);
	
	return img;
}