WinSCard.SCardTransmit: Cannot marshal 'parameter #2': Generic types cannot be marshaled.

[franciscosamuel]

I'm trying to invoke SCardTransmit with the code below and getting an exception with the message "Cannot marshal 'parameter #2': Generic types cannot be marshaled.".

Looking at how other functions that also take a SafeCoTaskMemStruct are declared, it seems like the problem is exactly what the exception message says: the parameters have to be declared as IntPtr

public bool SendCommand(byte[] data, out byte[] output)
		{
			var sendPci = new WinSCard.SCARD_IO_REQUEST();
			sendPci.dwProtocol = _activeProtocol;
			sendPci.cbPciLength = (uint)Marshal.SizeOf(sendPci);

			var recvPci = new WinSCard.SCARD_IO_REQUEST();
			recvPci.dwProtocol = _activeProtocol;
			recvPci.cbPciLength = (uint)Marshal.SizeOf(recvPci);

			uint recvLength = 256;
			output = new byte[recvLength];

			GCHandle dataPinned = GCHandle.Alloc(data, GCHandleType.Pinned);
			GCHandle recvDataPinned = GCHandle.Alloc(output, GCHandleType.Pinned);

			var _lastRet = WinSCard.SCardTransmit(_card,
											 new SafeCoTaskMemStruct<WinSCard.SCARD_IO_REQUEST>(sendPci),
											 dataPinned.AddrOfPinnedObject(),
											 (uint)data.Length,
											 new SafeCoTaskMemStruct<WinSCard.SCARD_IO_REQUEST>(recvPci),
											 recvDataPinned.AddrOfPinnedObject(),
											 ref recvLength);

			dataPinned.Free();
			recvDataPinned.Free();

			return _lastRet.Succeeded;
		}