CODEWITHSUNDEEP
c#windows-servicesdesktop-applicationfingerprintdigital-persona-sdk
Nic
Nic

Reputation: 227

Fingerprint capturing with DigitalPersona 5300 Reader. How to detect the device in a windows service?

I'm trying to integrate the U.are.U 5300 Fingerprint device in my web application using windows service. I'm using SignalR to communicate back and forth, but that isn't a problem. I've a small piece of code which returns the first device that is attached to the machine.

 public Reader GetReader()
        {
            if (this._reader == null)
            {
                this._reader = ReaderCollection.GetReaders()[0];
                var openResult = this._reader.Open(Constants.CapturePriority.DP_PRIORITY_COOPERATIVE);
                _res = this._reader.GetDefaultRes();
            }
            return this._reader;
        }

I de-compiled the hardware dll and this is the actual code that they use (not sure if this will help).

 public static ReaderCollection GetReaders()
        {
            unsafe
            {
                ReaderCollection readerCollections;
                using (Tracer tracer = new Tracer("ReaderCollection::GetReaders"))
                {
                    Constants.ResultCode resultCode = Constants.ResultCode.DP_DEVICE_FAILURE;
                    if (ReaderCollection.instance == null)
                    {
                        ReaderCollection.instance = new ReaderCollection();
                        try
                        {
                            ReaderCollection.instance.m_items = new List<Reader>();
                            NativeMethods.SetDllDirectory();
                            resultCode = NativeMethods.dpfpdd_init();
                            tracer.TraceResult((int)resultCode);
                            if (!resultCode.Equals(Constants.ResultCode.DP_SUCCESS) && (int)resultCode != 1)
                            {
                                ReaderCollection.instance = null;
                                throw new SDKException(resultCode, "Could not initialize driver", new InvalidOperationException());
                            }
                            resultCode = NativeMethods.dpfj_select_engine((IntPtr)0, Constants.EngineType.DP_ENGINE_DPFJ);
                            tracer.TraceResult((int)resultCode);
                            if (!resultCode.Equals(Constants.ResultCode.DP_SUCCESS))
                            {
                                ReaderCollection.instance = null;
                                throw new SDKException(resultCode, "Could not slect Engine Type", new InvalidOperationException());
                            }
                        }
                        catch (Exception exception)
                        {
                            tracer.Trace(exception.Message);
                            ReaderCollection.instance = null;
                            throw new SDKException(Constants.ResultCode.DP_FAILURE, string.Empty, null);
                        }
                    }
                    resultCode = Constants.ResultCode.DP_FAILURE;
                    int num = 0;
                    NativeMethods.DPFPDD_DEV_INFO[] dPFPDDDEVINFOArray = null;
                    try
                    {
                        resultCode = NativeMethods.dpfpdd_query_devices(ref num, dPFPDDDEVINFOArray);
                        if (!num.Equals(0))
                        {
                            dPFPDDDEVINFOArray = new NativeMethods.DPFPDD_DEV_INFO[num];
                            dPFPDDDEVINFOArray[0].size = Marshal.SizeOf(dPFPDDDEVINFOArray[0]);
                            resultCode = NativeMethods.dpfpdd_query_devices(ref num, dPFPDDDEVINFOArray);
                            tracer.Trace(string.Format("dpfpdd_query_devices called, count is {0}", num.ToString()));
                        }
                        ReaderCollection.Refresh(dPFPDDDEVINFOArray);
                        readerCollections = ReaderCollection.instance;
                    }
                    catch (Exception exception1)
                    {
                        tracer.Trace(exception1.Message);
                        throw new SDKException(Constants.ResultCode.DP_FAILURE, string.Empty, null);
                    }
                }
                return readerCollections;
            }
        }

This code works fine in a windows form application (desktop application). But it is not able to detect my device in a windows service.

Do we have any special permissions (windows or app level) that we need to set to detect the device or interact through a windows service?

Upvotes: 1

Views: 2078

Answers (1)

Nic
Nic

Reputation: 227

Got the answer: By default the U.are.U SDK installs the DigitalPersona Authenication Service, all you need to do is disable this service!

Upvotes: 0

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