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我是智能卡读卡器的新手。我买了一个 ACR1252u 并被困在禁用蜂鸣器和 led 中。我试过这个代码： https ://the--semicolon.blogspot.it/p/this-is-simple-way-to-restart-your.html?showComment=1468833507200

  public void turnOffBuzzer()
        {
                retCode = Card.SCardConnect(hContext, readername, Card.SCARD_SHARE_SHARED, Card.SCARD_PROTOCOL_T0 | Card.SCARD_PROTOCOL_T1, ref hCard, ref Protocol);
                byte data=  0x00 ;
                byte[] control = new byte[] { 0xE0, 0x00, 0x00, 0x28, 0x01 };
                uint value = BitConverter.ToUInt32(control, 0);
                byte receivedBytes = new byte();
                int pcbBytesReturned = 0;
                long status = Card.SCardControl(hCard, value, ref data, 1,ref receivedBytes , 1, ref  pcbBytesReturned);
                MessageBox.Show(status.ToString());
        }

但是状态给了我 1 而不是 0

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2 回答 2

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如果您想在阅读器附近没有任何 rfid 标签时发送一些 ScardControl 命令，您可以尝试在 Card.SCardConnect 函数中使用“Card.SCARD_SHARE_DIRECT”。

于 2019-09-12T08:55:20.230 回答
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嗯，我发现它是如何工作的！

关闭蜂鸣器：

 retCode = Card.SCardConnect(hContext, readername, Card.SCARD_SHARE_SHARED,
                  Card.SCARD_PROTOCOL_T0 | Card.SCARD_PROTOCOL_T1, ref hCard, ref Protocol);

            Byte[] setBuzzerLoud = new Byte[6];
            setBuzzerLoud[0] = 0xE0;
            setBuzzerLoud[1] = 0x00;
            setBuzzerLoud[2] = 0x00;
            setBuzzerLoud[3] = 0x21;
            setBuzzerLoud[4] = 0x01;
            setBuzzerLoud[5] = 0x77;
            uint pcBytesReturned = 0;
            Byte[] RecieveBuff = new Byte[64];
            uint controlcode = 3225264;
            int status = Card.SCardControl(hCard, controlcode, ref setBuzzerLoud[0], 6, ref RecieveBuff[0], RecieveBuff.Length, ref pcBytesReturned);

            MessageBox.Show(status.ToString());

用于关闭 LED：

  retCode = Card.SCardConnect(hContext, readername, Card.SCARD_SHARE_SHARED,
               Card.SCARD_PROTOCOL_T0 | Card.SCARD_PROTOCOL_T1, ref hCard, ref Protocol);

            Byte[] setLEDOFF = new Byte[6];
            setLEDOFF[0] = 0xE0;
            setLEDOFF[1] = 0x00;
            setLEDOFF[2] = 0x00;
            setLEDOFF[3] = 0x21;
            setLEDOFF[4] = 0x01;
            setLEDOFF[5] = 0x79;
            uint pcBytesReturned = 0;
            Byte[] RecieveBuff = new Byte[64];
            uint controlcode = 3225264;
            int status = Card.SCardControl(hCard, controlcode, ref setLEDOFF[0], 6, ref RecieveBuff[0], RecieveBuff.Length, ref pcBytesReturned);

            MessageBox.Show(status.ToString());

关闭射频：

 retCode = Card.SCardConnect(hContext, readername, Card.SCARD_SHARE_SHARED,
             Card.SCARD_PROTOCOL_T0 | Card.SCARD_PROTOCOL_T1, ref hCard, ref Protocol);

            Byte[] setRFOff = new Byte[6];
            setRFOff[0] = 0xE0;
            setRFOff[1] = 0x00;
            setRFOff[2] = 0x00;
            setRFOff[3] = 0x23;
            setRFOff[4] = 0x01;
            setRFOff[5] = 0x80;
            uint pcBytesReturned = 0;
            Byte[] RecieveBuff = new Byte[64];
            uint controlcode = 3225264;
            int status = Card.SCardControl(hCard, controlcode, ref setRFOff[0], 6, ref RecieveBuff[0], RecieveBuff.Length, ref pcBytesReturned);

            MessageBox.Show(status.ToString());

有趣的是控制代码，我在其中调试了链接中提到的 c++ 代码，以便为这个智能卡读卡器找到它：

DWORD controlcode = SCARD_CTL_CODE(3500);

转义码写在第 41/77 页。

SCARD_CTL_CODE(3500)

唯一的问题是如何在没有读卡器上的 rfid 的情况下关闭设置。我还找到了一篇文章，其中讨论了更改 USB 参数中的一些注册表项，我也将尝试它。任何可以帮助我的人我都会很高兴。

完毕！享受

于 2016-07-19T09:31:23.597 回答