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这个是大众普通方法，鉴于有网友和朋友问相同的问题。在这里将我的拙劣的代码关键部分贴出来。以便帮助很多其它的朋友们，不足之处甚多，我能够学习，交流，请教阁下

废话到此。直接上代码

private const int WS_CHILD = 0x40000000;  //1073741824
        private const int WS_VISIBLE = 0x10000000;  //268435456
        private const int WM_USER = 0x400;  //1024
        private const int WM_CAP_START = WM_USER;  //1024
        private const int WM_CAP_STOP = WM_CAP_START + 68;  //1092
        private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;  //1034
        private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;  //1035
        private const int WM_CAP_SAVEDIB = WM_CAP_START + 25;  //1049
        private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;  //1084
        private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;  //1086
        private const int WM_CAP_FILE_SET_CAPTRUE_FILEA = WM_CAP_START + 20;  //1044
        private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63;  //1087
        private const int WM_CAP_CAPTURE_IMAGE_CLIPBOARD = WM_CAP_START + 30;  //1054 复制捕捉的图像到剪切板
        private const int WM_CAP_SET_OVERLAY = WM_CAP_START + 51;  //1075
        private const int WM_CAP_SET_PREVIEW = WM_CAP_START + 50;  //1074
        private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;  //1030
        private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;  //1026
        private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;  //1027
        private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;  //1029
        private const int WM_CAP_SET_SCALE = WM_CAP_START + 53;  //1077
        private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52;  //1076
        private const int WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + 42;  //1066 选择摄像头

/// <summary>
        /// 开启视频摄像头
        /// </summary>
        /// <returns></returns>
        public static void Start()
        {
            if (bWorkStart)
            {
                return;
            }
            byte[] lpszName = new byte[100];
            try
            {
                hWndC = Windows.capCreateCaptureWindow(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);
                if (hWndC.ToInt32() != 0)
                {
                    Windows.SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);  //设置返回视频流
                    Windows.SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);  //设置返回错误
                    Windows.SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);  //设置返回状态
                    //=====================这条比較慢=======================
                    Windows.SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);  //设备连接
                    //=====================================================
                    //Windows.SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);  //開始捕捉
                    //=====================================================
                    Windows.SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);  //设置比例
                    Windows.SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);  //设置预览速度
                    Windows.SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);  //设置叠加
                    Windows.SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);  //设置预览


                    bWorkStart = true;
                }
                //return true;
            }
            catch (Exception)
            {
                //return false;
            }
            //finally
            //{
                //写日志  Global.log.Write( “SendMessage “);
                //LogClass.WriteLog("SendMessage");
            //}
        }

/// <summary>
        /// 关闭视频摄像头
        /// </summary>
        public static void Stop()
        {
            Windows.SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
            bWorkStart = false;
        }

/// <summary>
        /// 抓图或者拍照。然后保存到指定路径下
        /// </summary>
        /// <param name="path">要保存bmp文件的路径</param>
        public static void GrabImage(string path)
        {
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            Windows.SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt32());  //0x41e
        }

/// <summary>
        /// 捕捉图像拷贝到剪切板
        /// </summary>
        /// <returns></returns>
        public static bool CopyToClipBoard()
        {
            return Windows.SendMessage(hWndC, WM_CAP_CAPTURE_IMAGE_CLIPBOARD, 0, 0); 
        }