public class CarDeviceDll

    {

        /*对dll库进行一些初始化*/

        [DllImport("IDI.dll")]

        public static extern int Init_IDI(string IP, int port);

        [DllImport("IDI.dll")]

        public static extern int Connect_IDI(string IP, int port);

        /*由客户端定时向服务器发送命令,检测连接状态*/

        [DllImport("IDI.dll")]

        public static extern void HeartBeat_IDI();

        /*从服务端接受数据*/

        [DllImport("IDI.dll")]

        public static extern int Recv_IDI(ref Client_Data rec);

        [DllImport("IDI.dll")]

        public static extern int QuideInfo_Check(byte DoorNo);

        [DllImport("IDI.dll")]

        public static extern int GetPic_From_Server_IDI(byte[] name, byte[] pic, int len);

        [DllImport("IDI.dll")]

        public static extern int GetPerson_From_Server_IDI(byte[] name, byte[] pic, int len);

        [DllImport("IDI.dll")]

        public static extern int Send_IDI(string sed,int iLen);

        [StructLayout(LayoutKind.Sequential, Pack = )]

        public struct Client_Data_Head

        {

            public UInt16 wHeader;

            public int iReserved;

            public byte byCommand;

            public  UInt16 wDataLen;

        }

        [StructLayout(LayoutKind.Sequential, Pack = )]

        public struct Client_Data

        {

            public UInt16 wHeader;

            public int iReserved;

            public byte byCommand;

            public UInt16 wDataLen;

            [MarshalAs(UnmanagedType.ByValTStr,SizeConst=)]

            public string szData;

        }

        [StructLayout(LayoutKind.Sequential, Pack = )]

        public struct PClientData

        {

            public UInt16 wHeader;

            public int iReserved;

            public byte byCommand;

            public UInt16 wDataLen;

            [MarshalAs(UnmanagedType.ByValTStr,SizeConst=)]

            public string szData;

        }

    }