如何让RFID阅读器读取，直到得到结果

Question

这是我第一次尝试编码RFID阅读器。

我有下面的代码，当我点击一个按钮读取卡ID，Id喜欢让代码不断阅读，直到有人把一张卡放在读卡器上，然后根据卡放在它上面做一些事情。

 private void btnRequest_Click(object sender, EventArgs e) 
    { 

     txtSearchPurse.Text = ""; 
     short icdev = 0x0000; 
     int status; 
     byte type = (byte)'A';//mifare one type is A 卡询卡方式为A 
     byte mode = 0x26; // Request the card which is not halted. 
     ushort TagType = 0; 
     byte bcnt = 0x04;//mifare 卡都用4, hold on 4 
     IntPtr pSnr; 
     byte len = 255; 
     sbyte size = 0; 


     if (!bConnectedDevice) 
     { 
      MessageBox.Show("Not connect to device!!", "error", MessageBoxButtons.OK, MessageBoxIcon.Error); 
      return; 
     } 

     pSnr = Marshal.AllocHGlobal(1024); 

     for (int i = 0; i < 2 ;i++) 
     { 
      status = rf_request(icdev, mode, ref TagType);//搜寻没有休眠的卡，request card 
      if (status != 0) 
       continue; 

      status = rf_anticoll(icdev, bcnt, pSnr, ref len);//防冲突得到返回卡的序列号, anticol--get the card sn 
      if (status != 0) 
       continue; 

      status = rf_select(icdev, pSnr, len, ref size);//锁定一张ISO14443-3 TYPE_A 卡, select one card 
      if (status != 0) 
       continue; 

      byte[] szBytes = new byte[len]; 

      for (int j = 0; j < len; j++) 
      { 
       szBytes[j] = Marshal.ReadByte(pSnr, j); 
      } 

      String m_cardNo = String.Empty; 

      for (int q = 0; q < len; q++) 
      { 
       m_cardNo += byteHEX(szBytes[q]); 
      } 
      txtSearchPurse.Text = m_cardNo;     

      break; 
     } 

     Marshal.FreeHGlobal(pSnr); 
    } 

此代码来自制造商，我对它的实际操作知之甚少。

任何信息都会很好。

Answer 1

是这样的吗？ 它将读卡器的代码放置在一个间隔为1秒的线程上。 只要卡被读取，您的代码就会被调用，您可以处理该卡。 只是一个让你入门的例子，还有很多需要改进的地方。

class CardReader : IDisposable 
    { 

     IntPtr _pSnr = Marshal.AllocHGlobal(1024); 
     private Thread _t; 
     private Action<string> _callback; 
     private volatile bool _stop; 

     public void ReadCard() 
     { 
      short icdev = 0x0000; 
      int status; 
      byte type = (byte)'A';//mifare one type is A 卡询卡方式为A 
      byte mode = 0x26; // Request the card which is not halted. 
      ushort TagType = 0; 
      byte bcnt = 0x04;//mifare 卡都用4, hold on 4 
      IntPtr pSnr; 
      byte len = 255; 
      sbyte size = 0; 

      for (int i = 0; i < 2; i++) { 
       status = rf_request(icdev, mode, ref TagType);//搜寻没有休眠的卡，request card 
       if (status != 0) 
        continue; 

       status = rf_anticoll(icdev, bcnt, pSnr, ref len);//防冲突得到返回卡的序列号, anticol--get the card sn 
       if (status != 0) 
        continue; 

       status = rf_select(icdev, pSnr, len, ref size);//锁定一张ISO14443-3 TYPE_A 卡, select one card 
       if (status != 0) 
        continue; 

       byte[] szBytes = new byte[len]; 

       for (int j = 0; j < len; j++) { 
        szBytes[j] = Marshal.ReadByte(pSnr, j); 
       } 

       String m_cardNo = String.Empty; 

       for (int q = 0; q < len; q++) { 
        m_cardNo += byteHEX(szBytes[q]); 
       } 

       _callback(m_cardNo); 

       break; 
      } 
     } 

     public void Work() 
     { 
      while (!_stop) 
      { 
       ReadCard(); 
       Thread.Sleep(1000); 
      } 
     } 

     public void Start(Action<string> cardRead) 
     { 
      if (_t != null) 
       return; 

      _stop = false; 

      _callback = cardRead; 

      _t = new Thread(Work); 
      _t.Start(); 
     } 

     public void Stop() 
     { 
      if (_t != null) 
      { 
       _stop = true; 
       _t.Join(); 
       _t = null; 
      } 
     } 

     public void Dispose() 
     { 
      Marshal.FreeHGlobal(_pSnr);     
     } 
    } 

用法：

var reader = new CardReader(); 
reader.Start(CardReaded); 

private void CardReaded(string cardnr){ 
... 
}