Using unmanaged NxpRdLib DLL

Forum / MIFARE and NFC Reader IC`s / Using unmanaged NxpRdLib DLL

  • 18. April 2016 at 11:41
    I am trying to control a NXP RD701 Reader from a C# program with the NxpRdLib.dll.
    When I launch the code below, the message box shows every time "288" and all variables of balRd70x have the value as initially. Can someone help me?

    public static phbalReg_Rd70xUsbWin_DataParams_t balRd70x;

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct phbalReg_Rd70xUsbWin_DataParams_t
    internal ushort wId;
    internal byte ucTxSeq;
    internal string pDeviceName;
    internal IntPtr pDeviceHandle;
    internal IntPtr pPipeOut;
    internal IntPtr pPipeIn;
    internal ushort wTimeoutWrMs;
    internal ushort wTimeoutRdMs;

    [DllImport("NxpRdLib.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Unicode, EntryPoint = "phbalReg_Rd70xUsbWin_Init")]
    public static extern ushort phbalReg_Rd70xUsbWin_Init (ref phbalReg_Rd70xUsbWin_DataParams_t pDataParams, ushort wSizeOfDataParams);

    public MainWindow()

    private void Button_Click(object sender, RoutedEventArgs e)

    public static unsafe ushort connectToPegoda()
    balRd70x = new phbalReg_Rd70xUsbWin_DataParams_t();
    ushort wSizeOfDataParams = (ushort)Marshal.SizeOf(typeof(phbalReg_Rd70xUsbWin_DataParams_t));
    return phbalReg_Rd70xUsbWin_Init(ref balRd70x, wSizeOfDataParams);

    + 0  |  - 0

    Re: Using unmanaged NxpRdLib DLL

    18. April 2016 at 11:46
    I forgot to join the definition of phbalReg_Rd70xUsbWin_DataParams_t

    + 0  |  - 0

    Re: Using unmanaged NxpRdLib DLL

    4. May 2016 at 14:31
    Hi Gaëtan,

    I have never used the library from C#. But for me it seems that you do not initialize the library correct. As a recommendation you should test the functionality first with the enclosed test program and if everything works, go and move your code to C#.

    Kind regards,
    The MIFARE Team

    + 0  |  - 0
Viewing 3 posts - 1 through 3 (of 3 total)

You must be logged in to reply to this topic.