Using unmanaged NxpRdLib DLL

[Gaëtan Chambouvet]

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;

	[MarshalAs(UnmanagedType.LPStr)]

	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()

{

	InitializeComponent();

}



private void Button_Click(object sender, RoutedEventArgs e)

{

	MessageBox.Show(connectToPegoda().ToString());

}



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);

}

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[Gaëtan Chambouvet]

I forgot to join the definition of phbalReg_Rd70xUsbWin_DataParams_t

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[mifaresdk]

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

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