[DllImport("avicap32.dll")]

        public static extern IntPtr capCreateCaptureWindowA(string lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);

        [DllImport("avicap32.dll")]

        public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer);

        [DllImport("User32.dll")]

        public static extern bool SendMessage(IntPtr hWnd, int wMsg, bool wParam, int lParam);

        [DllImport("User32.dll")]

        public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, int lParam);

        [DllImport("User32.dll")]

        public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, FrameEventHandler lParam);

        [DllImport("User32.dll")]

        public static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);

        [DllImport("avicap32.dll")]

        public static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);

        [DllImport("User32.dll")]

        public static extern bool DestroyWindow(int hndw);

这些是CameraBase类里引入视频API的方法

        /// <summary>

        /// 打开摄像头。

        /// </summary>

        public void Open()

        {

            this.fWindowPtr = CameraBase.capCreateCaptureWindowA("0", 0x50000000, 0, 0, this.fWidth, this.fHeight, this.fControlPtr, 0);