SCardTransmit 返回 SCARD_W_RESET_CARD

最新推荐文章于 2019-12-21 19:47:54 发布

原创最新推荐文章于 2019-12-21 19:47:54 发布 · 1.9k 阅读

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#SCardTransmit #SCARD_W_RESET_CARD

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本文介绍在使用智能卡进行通信时，如何避免因应用重置卡片导致的SCARD_W_RESET_CARD错误。通过调用SCardReconnect来重新建立连接，确保连续发送指令时的稳定性。

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  在调用完 SCardconnect 之后，需要调用一次
 SCardReconnect

  然后再调用获取卡片状态。
 
  否则一条命令之后，隔3秒再发另外一个，就会返回SCARD_W_RESET_CARD
 
 SCARDCONTEXT hContext;
 
 SCARDHANDLE hCard;

  DWORD dwActiveProtocol, dwSendLength, dwRecvLength;

  LONG rv;

  BYTE pbRecvBuffer[10];

  BYTE pbSendBuffer[] = {0xC0, 0xA4, 0x00, 0x00, 0x02, 0x3F, 0x00};

  ...

  rv = 
  SCardEstablishContext(
 SCARD_SCOPE_SYSTEM, NULL, NULL, &hContext);

  rv = 
  SCardConnect(hContext, 
  "Reader X", 
  SCARD_SHARE_SHARED,
 
 SCARD_PROTOCOL_T0, &hCard, &dwActiveProtocol);

  ...

  dwSendLength = 
 sizeof(pbSendBuffer);

  dwRecvLength = 
 sizeof(pbRecvBuffer);

  rv = 
  SCardTransmit(hCard, 
  SCARD_PCI_T0, pbSendBuffer, dwSendLength,

  &pioRecvPci, pbRecvBuffer, &dwRecvLength);

  / * Card has been reset by another application * /
 
 if (rv == 
  SCARD_W_RESET_CARD)

  {

  rv = 
  SCardReconnect(hCard, 
  SCARD_SHARE_SHARED, 
  SCARD_PROTOCOL_T0,
 
 SCARD_RESET_CARD, &dwActiveProtocol);

  }