static extern int SendMessage( IntPtr hwnd, int wMsg, int wParam, ref CaptureParms lParam );
/// <summary>
/// ����Ƶ
/// </summary>
/// <param name="control"></param>
/// <param name="index"></param>
public VideoCapturer(Control control, int index)
{
this.index = index;
m_hwnd = capCreateCaptureWindow(new byte[100], WS_VISIBLE | WS_CHILD, 0, 0, control.Width, control.Height, control.Handle, 0);
if (m_hwnd == IntPtr.Zero) throw new AVException();
m_parms = new CaptureParms();
m_streamCallBack = new capVideoStreamCallback(this.streamCallBack);
m_errorCallBack = new capErrorCallback(this.capErrorCallback);
SendMessage(m_hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, m_streamCallBack);
SendMessage(m_hwnd, WM_CAP_SET_CALLBACK_ERRORA, 0, m_errorCallBack);
}