[SmartCard]I would like to see an example implementation of SCardTransmit().

[Mevius21]

int SCardTransmit(
        int hCard,
        Pointer<SCARD_IO_REQUEST> pioSendPci,
        Pointer<Uint8> pbSendBuffer,
        int cbSendLength,
        Pointer<SCARD_IO_REQUEST> pioRecvPci,
        Pointer<Uint8> pbRecvBuffer,
        Pointer<Uint32> pcbRecvLength)

I've been trying to implement WinScard recently, but I'm stuck on SCardTransmit.
I would like an example of implementation.

Also, I would like to know how to get IDm.

[timsneath]

There's an example of using it from C code here: https://stackoverflow.com/questions/24560471/scardtransmit-how-to-read-and-write-smartcard

As a general rule, this package is a direct mapping of the Win32 headers to Dart, so C-based examples should be relatively easy to transfer. Given the tens of thousands of APIs in Win32, it's obviously beyond the scope of the package to document them all with worked examples, but I'd very warmly appreciate contributions to the example/ directory.

[Mevius21]

If you can resolve SCardTransmit and IDm, you can add it to example/.

[hbolin]

  int sendCommandToCard(int hCard, int SCARD_PROTOCOL, List<int> command) {
    Uint8List bytes = Uint8List.fromList(command);
    Pointer<Uint8> pbSendBuffer = bytes.allocatePointer();
    int cbSendLength = bytes.length;
    const int pbRecvBufferLength = 256; // 缓冲区长度
    Pointer<Uint8> pbRecvBuffer = Uint8List(pbRecvBufferLength).allocatePointer();
    Pointer<Uint32> pcbRecvLength = calloc<Uint32>();
    pcbRecvLength.value = pbRecvBufferLength;

    Pointer<SCARD_IO_REQUEST> pioSendPci = calloc<SCARD_IO_REQUEST>()
      ..ref.cbPciLength = sizeOf<SCARD_IO_REQUEST>()
      ..ref.dwProtocol = SCARD_PROTOCOL;

    int retCode = SCardTransmit(hCard, pioSendPci, pbSendBuffer, cbSendLength, nullptr, pbRecvBuffer, pcbRecvLength);
    if (retCode == SCARD_S_SUCCESS) {
      Uint8List byte = pbRecvBuffer.asTypedList(pcbRecvLength.value);
      debugPrint("SCardTransmit - result:$retCode lenght:${pcbRecvLength.value} byte:$byte");
    }
    return retCode;
  }