如何从数据库反序列化指纹的序列化模板？ [英] How to deserialize a serialize template of fingerprint from the database?
问题描述
我正在使用digitalpersona u.are.u 4500指纹识别器。
这是我用来将指纹模板保存到数据库的代码：
Dim str As New MemoryStream
Enroller.Template.Serialize（str）
Dim serializedTemplate As Byte（）= str.ToArray（）
Dim bytes（）as Byte = serializedTemplate
comm.Parameters.AddWithValue（@ Emp_FPrint，bytes）
问题是当我尝试从数据库中检索指纹并对其进行反序列化时，我有这样的错误：
从类型Byte（）转换为类型字节无效。
我尝试过：
Sub OnComplete（ByVal Capture As Object，ByVal ReaderSerialNumber As String，ByVal Sample as DPFP.Sample）实现DPFP.Capture.EventHandler.OnComplete
MakeReport（捕获指纹样本。）
SetPrompt（扫描同一个fing再次打印。）
流程（样本）
CheckTemplate（）
如果ds1MaxRow> 0然后
For i = 0 to ds1MaxRow - 1
'byteArray = CType（ds1VerifyFPrintp.Tables（TestImage）。Rows（i）.Item（1），字节（））
con1 =新的SqlConnection
con1.ConnectionString =数据源= ERSERVER;初始目录=计时;用户ID = sa;密码= sa
将thequery变暗为String =从TestImage中选择Emp_FPrint
con1.Open（）
Dim cmd As SqlCommand = New SqlCommand（thequery，con1）
Dim rsBioData As SqlDataReader = cmd.ExecuteReader
Dim byteTemplate As Byte
Dim memStreamTemplate As MemoryStream
如果rsBioData.HasRows那么
虽然rsBioData.Read
byteTemplate = rsBioData（Emp_FPrint）'''''''错误在这里：从典型转换e'Byte（）'键入'Byte'无效。 '''''''
memStreamTemplate =新的MemoryStrea（byteTemplate）
Me.Template.DeSerialize（memStreamTemplate）
结束时
结束如果'''''''''''''''''''''$ $ $ $ $ $ $ $ $ $ $ $ $ $ $
FeatureSet = ExtractFeatures（Sample，DPFP.Processing.DataPurpose.Verification）
'检查样品质量并开始验证是否合适
如果Not features is Nothing Then
'将功能集与我们的模板进行比较
Dim results As DPFP.Verification.Verification.Result = New DPFP.Verification.Verification.Result（ ）
Verificator.Verify（功能，模板，结果）
'UpdateStatus（result.FARAchieved）
如果result.Verified那么
MakeReport（指纹已经过验证。）
否则
MakeReport（指纹未经验证。）
结束如果
结束如果
下一页我
结束如果
End Sub
Im using digitalpersona u.are.u 4500 fingerprint reader.
This is the codes I used to save fingerprint template to database:
Dim str As New MemoryStream
Enroller.Template.Serialize(str)
Dim serializedTemplate As Byte() = str.ToArray()
Dim bytes() as Byte = serializedTemplate
comm.Parameters.AddWithValue("@Emp_FPrint", bytes)
The problem is when I try to retrieve fingerprint from the database and Deserialize it , I have this error:
"Conversion from type Byte() to type Byte is not valid."
What I have tried:
Sub OnComplete(ByVal Capture As Object, ByVal ReaderSerialNumber As String, ByVal Sample As DPFP.Sample) Implements DPFP.Capture.EventHandler.OnComplete
MakeReport("The fingerprint sample was captured.")
SetPrompt("Scan the same fingerprint again.")
Process(Sample)
CheckTemplate()
If ds1MaxRow > 0 Then
For i = 0 To ds1MaxRow - 1
' byteArray = CType(ds1VerifyFPrintp.Tables("TestImage").Rows(i).Item(1), Byte())
con1 = New SqlConnection
con1.ConnectionString = "Data Source=ERSERVER;Initial Catalog=Timekeeping;User ID=sa;Password=sa"
Dim thequery As String = "Select Emp_FPrint from TestImage "
con1.Open()
Dim cmd As SqlCommand = New SqlCommand(thequery, con1)
Dim rsBioData As SqlDataReader = cmd.ExecuteReader
Dim byteTemplate As Byte
Dim memStreamTemplate As MemoryStream
If rsBioData.HasRows Then
While rsBioData.Read
byteTemplate = rsBioData("Emp_FPrint") ''''''''ERROR HERE : Conversion from type 'Byte()' to type 'Byte' is not valid. '''''''
memStreamTemplate = New MemoryStrea(byteTemplate)
Me.Template.DeSerialize(memStreamTemplate)
End While
End If '''''''STUCK UNTO THIS LINE''''''''''
Dim features As DPFP.FeatureSet = ExtractFeatures(Sample, DPFP.Processing.DataPurpose.Verification)
' Check quality of the sample and start verification if it's good
If Not features Is Nothing Then
' Compare the feature set with our template
Dim result As DPFP.Verification.Verification.Result = New DPFP.Verification.Verification.Result()
Verificator.Verify(features, Template, 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 i
End If
End Sub
推荐答案
Dim byteTemplate As Byte
错误消息很清楚。您不能将字节数组反序列化为单个字节。
The error message is quite clear. You cannot deserialize an array of Bytes into a single Byte.
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