读卡器的Win32 Dll调用

 unsafe class Program

 {

     [DllImport("mwhrf_bj.dll")]

     public static extern int rf_card(int icdev, Byte _Mode, UInt64* _Snr);

     [DllImport("mwhrf_bj.dll")]

     public static extern int Open_USB();

     [DllImport("mwhrf_bj.dll")]

     public static extern int Close_USB(int icdev);

     [DllImport("mwhrf_bj.dll")]

     public static extern int rf_beep(int icdev, UInt32 _Msec);

     static void Main(string[] args)

     {

         int devID = Open_USB();

         Console.WriteLine("打开端口成功");

         while (true)

         {

             UInt64 cardSN;

             int flag= rf_card(devID, (Byte)0x00, &cardSN);//寻一次卡 然后卡片必须拿开

             //int flag= rf_card(devID, (Byte)0x00, &cardSN);//在卡片不拿走的情况连续询卡

             if (flag != )

             {

                 rf_beep(devID, );

                 Console.WriteLine("寻卡成功，卡号是{0}", cardSN);

             }

             Thread.Sleep();

         }

         Close_USB(devID);

         Console.WriteLine("关闭端口成功");

     }

 }