使用 DigitalPersona 5300 采集指纹 Reader。如何检测 windows 服务中的设备？

Question

我正在尝试使用 windows 服务将 U.are.U 5300 指纹设备集成到我的 Web 应用程序中。我正在使用 SignalR 来回通信，但这不是问题。我有一小段代码 returns 第一个连接到机器的设备。

 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;
        }

我反编译了硬件 dll，这是他们使用的实际代码（不确定这是否有帮助）。

 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;
            }
        }

此代码在 windows 表单应用程序（桌面应用程序）中运行良好。但是它无法在 windows 服务中检测到我的设备。

我已将 windows 服务权限设置为 'Local System'
启用设置为 'Allow service to interact with desktop'

我们是否需要设置任何特殊权限（windows 或应用级别）来检测设备或通过 windows 服务进行交互？

Answer 1

得到答案：默认情况下，U.are.U SDK 安装 DigitalPersona 身份验证服务，您需要做的就是禁用此服务！

使用 DigitalPersona 5300 采集指纹 Reader。如何检测 windows 服务中的设备？

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