//DLL中的函数声明
//app传入
//buffer 传出
ISO8583DLL_API int Pack_Ex (application*  app,unsigned char * buffer );

//机构体定义
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
        internal struct Application_Ex
        {
            public static Application_Ex InitShuZu()
            {
                Application_Ex obj = new Application_Ex();
                obj.process_code = new byte[5];
                obj.trans_type = new byte[3];
                obj.park_id = new byte[PARK_ID_LENGTH + 1];
                obj.terminal_id = new byte[TERMINAL_ID_LENGTH + 1];
             //.............   
            //内容太多，没有贴完
            }
            //     package
   
            public byte[] source_tpdu ;         
            public byte[] target_tpdu ;        

            public byte itrans_type;        
            public byte[] trans_type ;    
             //.............   
            //内容太多，没有贴完
        }
//DLL函数导出
        [DllImport("ISO8583Dll.dll", EntryPoint = "Pack_Ex")]
        private static extern int Pack_Ex(Application_Ex app_ex, byte[] buff);

//函数调用
        unsafe public static void jgtdy()
        {
            Application_Ex m_txd = new Application_Ex();
            m_txd = Application_Ex.InitShuZu();
 
            try
            {
                //赋值
                m_txd.process_code[0] = (byte)'0';
                m_txd.process_code[1] = (byte)'0';
                m_txd.process_code[2] = (byte)'0';
                m_txd.process_code[3] = (byte)'6';

                m_txd.trans_type[0] = (byte)'8';
                m_txd.trans_type[1] = (byte)'1';
                //010101009001
                m_txd.park_id[0] = (byte)'0';
                m_txd.park_id[1] = (byte)'1';
                m_txd.park_id[2] = (byte)'0';
                m_txd.park_id[3] = (byte)'1';
                m_txd.park_id[4] = (byte)'0';
                m_txd.park_id[5] = (byte)'1';
                m_txd.park_id[6] = (byte)'0';
                m_txd.park_id[7] = (byte)'0';
                m_txd.park_id[8] = (byte)'9';
                m_txd.park_id[9] = (byte)'0';
                m_txd.park_id[10] = (byte)'0';
                m_txd.park_id[11] = (byte)'1';

                //02010001
                m_txd.terminal_id[0] = (byte)'0';
                m_txd.terminal_id[1] = (byte)'2';
                m_txd.terminal_id[2] = (byte)'0';
                m_txd.terminal_id[3] = (byte)'1';
                m_txd.terminal_id[4] = (byte)'0';
                m_txd.terminal_id[5] = (byte)'0';
                m_txd.terminal_id[6] = (byte)'0';
                m_txd.terminal_id[7] = (byte)'1';

                //20120420
                m_txd.trans_date[0] = (byte)'2';
                m_txd.trans_date[1] = (byte)'0';
                m_txd.trans_date[2] = (byte)'1';
                m_txd.trans_date[3] = (byte)'2';
                m_txd.trans_date[4] = (byte)'0';
                m_txd.trans_date[5] = (byte)'4';
                m_txd.trans_date[6] = (byte)'2';
                m_txd.trans_date[7] = (byte)'0';

                //005006
                m_txd.trans_time[0] = (byte)'0';
                m_txd.trans_time[1] = (byte)'0';
                m_txd.trans_time[2] = (byte)'5';
                m_txd.trans_time[3] = (byte)'0';
                m_txd.trans_time[4] = (byte)'0';
                m_txd.trans_time[5] = (byte)'6';
                //000100
                m_txd.lsh = 000100;

                m_txd.host_lsh = 000000000000;
                //000101
                m_txd.batch_no = 000101;

                m_txd.amount = 000000000000;

                //0033
                m_txd.para_ver = 0033;