使用GDI+的FromBITMAPINFO函数会导致内存泄露！ IplImage和Bitmap都是内存图形的表示方法，前者是OpenCV开源视觉库的，后者是GDI+的。如果在VC中使用OpenCV库的话，很可能会用到这两者的转换。

IplImage* Bitmap2IplImage(Bitmap* pBitmap)
{
	if (!pBitmap)
		return NULL;
 
	int w = pBitmap->GetWidth();
	int h = pBitmap->GetHeight();
 
	BitmapData bmpData;
	Rect rect(0,0,w,h);
	pBitmap->LockBits(&rect, ImageLockModeRead, PixelFormat24bppRGB, &bmpData);
	BYTE* temp = (bmpData.Stride>0) ? ((BYTE*)bmpData.Scan0) : ((BYTE*)bmpData.Scan0 + bmpData.Stride*(h-1));
 
	IplImage* pIplImg = cvCreateImage(cvSize(w, h), IPL_DEPTH_8U, 3);
	if (!pIplImg)
	{
		pBitmap->UnlockBits(&bmpData);
		return NULL;
	}
 
	memcpy(pIplImg->imageData, temp, abs(bmpData.Stride)*bmpData.Height);
	pBitmap->UnlockBits(&bmpData);
 
	//判断Top-Down or Bottom-Up
	if (bmpData.Stride<0)
		cvFlip(pIplImg, pIplImg);
 
	return pIplImg;
}

// pBitmap 同样需要外部释放
Bitmap*  IplImage2Bitmap(IplImage* pIplImg)
{
	if(!pIplImg)
		return NULL;
 
	Bitmap *pBitmap = new Bitmap(pIplImg->width, pIplImg->height, PixelFormat24bppRGB);
	if (!pBitmap)
		return NULL;
 
	BitmapData bmpData;
	Rect rect(0, 0, pIplImg->width, pIplImg->height);
	pBitmap->LockBits(&rect, ImageLockModeWrite, PixelFormat24bppRGB, &bmpData);
	BYTE *pByte = (BYTE*)bmpData.Scan0;
 
	if (pIplImg->widthStep == bmpData.Stride) //likely
		memcpy(bmpData.Scan0, pIplImg->imageDataOrigin, pIplImg->imageSize);
 
	pBitmap->UnlockBits(&bmpData);
	return pBitmap;
}

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