学步园

1.配置OpenCV、DirectShow.

2.代码如下：

int hello::Camera(){
	int cam_count;
	cam_count = CCameraDS::CameraCount();//output the number of cameras in my computer
	cout<<cam_count<<endl;
	
	for(int i = 0;i < cam_count;i++){//output the name of all the cameras
		char cam_name[1024];
		int retval = CCameraDS::CameraName(i,cam_name,sizeof(cam_name));

		if(retval > 0)
			cout<<"Camera "<<i<<"'s Name is "<<cam_name<<endl;
		else
			cout<<"Can not get Camera "<<i<<"'s name."<<endl;
		
	}
	if(cam_count == 0)return -1;
	CCameraDS camera;//declare the first camera
	CCameraDS camera1;//declare the second camera

	if(!camera.OpenCamera(0,false,320,240)){
		cout<<"Can not open 0's camera."<<endl;
	}
	if(!camera1.OpenCamera(1,false,320,240)){
		cout<<"Can not open 1's camera."<<endl;
	}
	IplImage* pFrame = camera.QueryFrame();
	IplImage* pFrame1 = camera1.QueryFrame();

	cvNamedWindow("camera");
	cvNamedWindow("camera1");
	while(1){
		pFrame = camera.QueryFrame();
		cvShowImage("camera",pFrame);

		pFrame1 = camera1.QueryFrame();
		cvShowImage("camera1",pFrame1);
		if(cvWaitKey(40)==27)break;
	}
	cvReleaseImage(&pFrame);
	cvReleaseImage(&pFrame1);
	cvDestroyWindow("camera");
	cvDestroyWindow("camera1");
	return 0;
}