Question

有人可以帮我解决问题吗？我正在使用visual studio 2013 vb.net，我的数据库是mysql。我的数据库user上有一个表，其字段id是自动增量int，print数据类型是blob。保存指纹时，blob获得的大小为65kb，因此我认为已经是指纹。但是当我尝试验证它时，应用程序可能会停止工作并向我显示此错误消息：

An exception of type 'System.Runtime.InteropServices.COMException' occurred in DPFPVerNET.dll but was not handled in user code Additional information: Exception from HRESULT: 0xFFFFFFF8

DPFPVerNET.dll上是否有问题，或者只是我的代码？

无论如何，这是我的代码。

connectDB()

    Dim printFDB As DPFP.Template = New DPFP.Template
    Dim virifyFDB As New DPFP.Verification.Verification
    Dim memStream As MemoryStream

    Dim da As New MySqlDataAdapter
    Dim dt As New DataTable
    Dim i As Integer
    Dim data As Byte()

    Dim selectCom As New MySqlCommand("select * from user", con)

    With da
        .SelectCommand = selectCom
        .Fill(dt)
    End With

    For i = 0 To dt.Rows.Count - 1
        data = dt.Rows(i)("print")



        memStream = New MemoryStream(data)

        printFDB.DeSerialize(memStream)

        MyBase.Process(Sample)


        Dim features As DPFP.FeatureSet = ExtractFeatures(Sample, DPFP.Processing.DataPurpose.Verification)


        If Not features Is Nothing Then

            Dim result As DPFP.Verification.Verification.Result = New DPFP.Verification.Verification.Result()
            Verificator.Verify(features, printFDB, result)
            UpdateStatus(result.FARAchieved)
            If result.Verified Then
                MakeReport("The fingerprint was VERIFIED.")
            Else
                MakeReport("The fingerprint was NOT VERIFIED.")
            End If
        End If


    Next
disconnectDB()

我需要一些指导。谢谢。

这是错误：

DPFP.Error.SDKException: Event Handler has generated an Exception ---> System.Runtime.InteropServices.COMException: Exception from HRESULT: 0xFFFFFFF8 at DPFP.Verification.Verification.MC_verifyFeaturesEx(SafeHandle mcContext, Int32 templateSize, Byte[] templatePt, Int32 featureSetSize, Byte[] featureSet, Int32 reserved0, IntPtr reserved1, IntPtr reserved2, IntPtr reserved3, Double& achievedFar) at DPFP.Verification.Verification.Verify(FeatureSet FeatureSet, Template Template, Int32 FARRequested) at DPFP.Verification.Verification.Verify(FeatureSet FeatureSet, Template Template, Result& Result) at Enrollment.VerificationForm.Process(Sample Sample) in C:\Program Files\DigitalPersona\One Touch SDK\.NET\Samples\Visual Studio 2005\VBNET\Enrollment\VerificationForm.vb:line 65 at Enrollment.CaptureForm.OnComplete(Object Capture, String ReaderSerialNumber, Sample Sample) in C:\Program Files\DigitalPersona\One Touch SDK\.NET\Samples\Visual Studio 2005\VBNET\Enrollment\CaptureForm.vb:line 79 at DPFP.Capture.Capture.MessageReceived(Message& m) --- End of inner exception stack trace --- at DPFP.Error.ExceptionFactory.Throw(Exception Exception, ErrorCodes ErrorCode, String ErrorMessage) at DPFP.Capture.Capture.MessageReceived(Message& m) at DPFP.Capture.Capture.MessageEvents.MessageWindow.WndProc(Message& m)

从mysql数据库验证指纹时抛出异常

0 个答案: