public static extern Int32 H264_DVR_Login(StringBuilder sDVRIP, ushort wDVRPort, StringBuilder sUserName, StringBuilder sPassword, out H264_DVR_DEVICEINFO lpDeviceInfo, out short error, SocketStyle socketstyle);
public static extern Int32 H264_DVR_Login(string sDVRIP, ushort wDVRPort, string sUserName, string sPassword, out H264_DVR_DEVICEINFO lpDeviceInfo, out int error, SocketStyle socketstyle);