近期在研究OpenCv对摄像头的调用。现将代码贴出，供大家批评指正。

1、申明

#include"./opencv2/opencv.hpp"#ifdef _DEBUG#pragma comment(lib,"opencv_core249d.lib")
#pragma comment(lib,"opencv_highgui249d.lib")#else#pragma comment(lib,"opencv_core249.lib")
#pragma comment(lib,"opencv_highgui249.lib")#endifusing namespace cv;class COpencvCameraCtrl :public CCameraBase
{
public:VideoCapture vc;
public:COpencvCameraCtrl(void);~COpencvCameraCtrl(void);public:BOOL OpenCamera( HWND win, CString strVid, CString strPid );     //打开摄像头BOOL PhotoPic( CString strSaveFile );void CloseCamera();
};

2、打开摄像头

//打开摄像头
BOOL COpencvCameraCtrl::OpenCamera(HWND win, CString strVid, CString strPid)
{InitCameraWin( win );vid = strVid;pid = strPid;nIndex = GetCameraIndexInOs( vid, pid );if( nIndex < 0 ){return FALSE;}if( !vc.open( nIndex ) ){return FALSE;}vc.set( CV_CAP_PROP_FRAME_WIDTH, nWidth );vc.set( CV_CAP_PROP_FRAME_HEIGHT, nHight );   if( !vc.isOpened() ){bOpen = false;return FALSE;}bOpen = true;    return TRUE;
}

3、关闭摄像头

//关闭摄像头
void COpencvCameraCtrl::CloseCamera()
{if( vc.isOpened() ){vc.release();}
}

4、拍照而且保存到本地

//拍摄摄像头
BOOL COpencvCameraCtrl::PhotoPic( CString strSaveFile )
{Mat frame;vc >> frame;vc >> frame;if( !frame.data ){return FALSE;}//设置图像质量vector<int> compression_params;compression_params.push_back( IMWRITE_JPEG_QUALITY );compression_params.push_back( 75 );imwrite( strSaveFile.GetBuffer(0), frame, compression_params );strSaveFile.ReleaseBuffer(); return TRUE;
}

须要说明的是：每次从摄像头获取数据到Mat，须要运行两次

Mat frame;vc >> frame;vc >> frame;if( !frame.data ){return FALSE;}

假设只运行一次，会出现两个问题：

A、假设打开摄像头马上调用拍照保存，第一次会失败，获取不到数据

B、每次拍摄保存的图片是上一次的图片