Question

求一个VC6.0+OpenCV1.0+Directshow+EasyCap 1路USB采集卡采集监控摄像机视频的程序！

问题已解决，谢谢！

Answer 1

一、OpenCV的方法（注：OpenCV 最新版本 http://opencv.org/
/* start capturing frames from camera: index = camera_index + domain_offset (CV_CAP_*) */
CVAPI(CvCapture*) cvCreateCameraCapture( int index );

/* grab a frame, return 1 on success, 0 on fail.
this function is thought to be fast */
CVAPI(int) cvGrabFrame( CvCapture* capture );

/* get the frame grabbed with cvGrabFrame(..)
This function may apply some frame processing like
frame decompression, flipping etc.
!!!DO NOT RELEASE or MODIFY the retrieved frame!!! */
CVAPI(IplImage*) cvRetrieveFrame( CvCapture* capture );

/* Just a combination of cvGrabFrame and cvRetrieveFrame
!!!DO NOT RELEASE or MODIFY the retrieved frame!!! */
CVAPI(IplImage*) cvQueryFrame( CvCapture* capture );

/* stop capturing/reading and free resources */
CVAPI(void) cvReleaseCapture( CvCapture** capture );

二、DirectDraw的方法

///////////////////////////////////////////////////////////////////////
// StartCapture: Begin capture to file
///////////////////////////////////////////////////////////////////////
HRESULT CDxVideoGraphBase::StartCapture()
{
// Set the start time to 0 and stop time to MAX_TIME
REFERENCE_TIME stop = MAX_TIME;
HRESULT hr = m_pCaptureGraphBuilder2->ControlStream(&PIN_CATEGORY_CAPTURE, NULL,
NULL, NULL, &stop, 0, 0);
return hr;
}

前提是你的采集卡驱动要完全安装好。