MFC基于对话框读视频

本篇博客给出了一个基于对话框读视频的例子。事实上显示视频和显示图像的原理是一样的，它们都是对一副图像的处理。

本例程编译环境为VC6.0和Opencv1.0.

这里首先给出显示图像的函数：

本人所建的工程名字为ReadNewVedio，所以图像显示的函数为：

void CReadNewVedioDlg::ShowImage(int ID, IplImage *pImage)

其中ID为读入视频的路径。

void CReadNewVedioDlg::ShowImage(int ID, IplImage *pImage)

void CReadNewVedioDlg::ShowImage(int ID, IplImage *pImage)
{
	int nW = pImage->width;
	int nH = pImage->height;
    
	CRect rect;
	GetDlgItem(ID)->GetClientRect(&rect);
	CDC * pDC_ShowVideo = GetDlgItem(ID)->GetDC();
	int width_dst = rect.Width()-2;
	int height_dst = rect.Height()-2;
	if(pImage->width==width_dst && pImage->height==height_dst)
	{		
		ShowColorBmpOnScreen(pDC_ShowVideo, 1, 1, width_dst, height_dst,
			0, 0, pImage->width, pImage->height,
			(unsigned char *)(pImage->imageData));
	}
	else
	{		
		IplImage *pImg_Show = cvCreateImage(cvSize(width_dst, height_dst), 8, 3);
		memset(pImg_Show->imageData, 240, pImg_Show->imageSize);
		CvRect rect_roi;
		float ratio;
		float r1 = pImg_Show->width * 1.0f / pImage->width;
		float r2 = pImg_Show->height * 1.0f / pImage->height;
		if(r1<r2)
		{
			ratio = r1;
			fRetio = float(1 / r1);
			rect_roi.x = 0;
			rect_roi.width = pImg_Show->width;
			rect_roi.height = int(pImage->height * ratio - 0.5f);
			rect_roi.y = (pImg_Show->height - rect_roi.height)/2;
		}
		else
		{
			ratio = r2;
			fRetio = float(1 / r2);
			rect_roi.y = 0;
			rect_roi.height = pImg_Show->height;
			rect_roi.width = int(pImage->width * ratio - 0.5f);
			rect_roi.x = (pImg_Show->width - rect_roi.width)/2;
		}
		
		rect_Roi.top = rect_roi.y;
		rect_Roi.left = rect_roi.x;
		rect_Roi.bottom = rect_roi.y + rect_roi.height;
		rect_Roi.right = rect_roi.x + rect_roi.width;
		
		rect_roi.height;
		nStartX = rect_roi.x;          // “显示图像”的起点X坐标
		nStartY = rect_roi.y;          // “显示图像”的起点Y坐标
		
		cvSetImageROI(pImg_Show, rect_roi);	
		cvResize(pImage, pImg_Show); 
		
		ShowColorBmpOnScreen(pDC_ShowVideo, 1, 1, width_dst, height_dst,
			0, 0, pImg_Show->width, pImg_Show->height,
			(unsigned char *)(pImg_Show->imageData));
		
        cvResetImageROI(pImg_Show);
		cvReleaseImage(&pImg_Show);	
	}
	ReleaseDC(pDC_ShowVideo);

}

void CReadNewVedioDlg::ShowColorBmpOnScreen(CDC *pdc, int screen_left, int screen_top, int screen_width, int screen_height, int image_left, int image_top, int image_width, int image_height, unsigned char *pImageData)

void CReadNewVedioDlg::ShowColorBmpOnScreen(CDC *pdc, int screen_left, int screen_top, int screen_width, int screen_height, int image_left, int image_top, int image_width, int image_height, unsigned char *pImageData)
{
	pdc->SetStretchBltMode(COLORONCOLOR);
	BITMAPINFO bmpinfo;
	bmpinfo.bmiHeader.biBitCount=24;
	bmpinfo.bmiHeader.biWidth=image_width;
	bmpinfo.bmiHeader.biHeight=-image_height;	//注意到因为bmp是从下向上
	bmpinfo.bmiHeader.biSize=sizeof(BITMAPINFOHEADER);
	bmpinfo.bmiHeader.biSizeImage=image_width*image_height*3;
	bmpinfo.bmiHeader.biPlanes=1;
	bmpinfo.bmiHeader.biCompression=BI_RGB;
	::StretchDIBits(pdc->m_hDC,
		screen_left,screen_top,screen_width,screen_height,
		image_left,image_top,image_width,image_height,
		LPBYTE(pImageData), &bmpinfo,DIB_RGB_COLORS,SRCCOPY);
}

源代码下载地址：
http://download.csdn.net/detail/beijingmake209/7339397

显示结果：

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