Vb.net 如何使用VB在phpmyadmin数据库中保存和检索指纹模板

我们正在使用数字角色进行生物特征识别。我们已经可以保存员工ID、员工姓名和分配的手指。我们的问题是，我们不知道如何将指纹模板保存到数据库并检索它，以便生物特征扫描仪仍然可以读取和验证它。文件扩展名为“.ftp”

代码：

---

我知道这是一篇老文章，但这里的代码块可能会有所帮助

在保存时，我使用了这个

       For Each template As DPFP.Template In Data.Templates    
            If Not template Is Nothing Then 
                cmd = New MySqlCommand("INSERT INTO employeefp " +
                                  "SET No=@No, " +
                                  "FP=@FP " +
                                  " ", conn)

                cmd.Parameters.Add(New MySqlParameter("@No", txtEmpNo.Text))
                cmd.Parameters.Add(New MySqlParameter("@FP", template.Bytes))

                cmd.ExecuteNonQuery()

            End If
        Next

在从DB进行验证时，我使用了这个

       For Each template As DPFP.Template In Data.Templates    
            If Not template Is Nothing Then 
                cmd = New MySqlCommand("INSERT INTO employeefp " +
                                  "SET No=@No, " +
                                  "FP=@FP " +
                                  " ", conn)

                cmd.Parameters.Add(New MySqlParameter("@No", txtEmpNo.Text))
                cmd.Parameters.Add(New MySqlParameter("@FP", template.Bytes))

                cmd.ExecuteNonQuery()

            End If
        Next

当表单加载时，我会取出所有的指纹

    Dim cmd As New MySqlCommand("SELECT * FROM employeefp  ", conn)
    Dim rdr As MySqlDataReader = cmd.ExecuteReader()

    While (rdr.Read())
        Dim MemStream As IO.MemoryStream
        Dim fpBytes As Byte()

        fpBytes = rdr("FP")
        MemStream = New IO.MemoryStream(fpBytes)

        Dim templa8 As DPFP.Template = New DPFP.Template()
        templa8.DeSerialize(MemStream)

        Dim tmpObj As New AppData
        tmpObj.No = rdr("No").ToString()
        tmpObj.Template = templa8
        FPList.Add(tmpObj)
    End While

注意：Dim FPList As List（Of AppData）=New List（Of AppData）//除了现有模板（包含多个打印）之外，您还可以在我刚刚添加的SDK模板（包含一个打印）中找到此定义

比较机器上的当前样本

Sub OnComplete(ByVal Control As Object, ByVal FeatureSet As DPFP.FeatureSet, ByRef EventHandlerStatus As DPFP.Gui.EventHandlerStatus) Handles VerificationControl.OnComplete
Dim printFound As Boolean = False
VerifiedFPData = New AppData
Try
    For Each FPData As AppData In FPList
        Dim tmplateData As New DPFP.Template
        tmplateData = FPData.Template
        Dim compareTo As New DPFP.FeatureSet
        compareTo = FeatureSet

        Dim ver As New DPFP.Verification.Verification()
        Dim res As New DPFP.Verification.Verification.Result()

        If Not tmplateData Is Nothing Then
            ver.Verify(FeatureSet, tmplateData, res)

            If res.Verified Then
                EventHandlerStatus = DPFP.Gui.EventHandlerStatus.Success
                printFound = True
                VerifiedFPData = FPData
                Exit For ' success
            End If
        End If
    Next
Catch ex As Exception
    MessageBox.Show("verification error")
End Try


If printFound Then
    //TO DO 
Else
    EventHandlerStatus = DPFP.Gui.EventHandlerStatus.Failure
    // TODO
End If

端接头

---

希望它能帮助某人：）

上面的答案中缺少一些代码。类appdata的代码缺失。这些代码在类appdata中未首先声明tmpObj时出错<代码>尺寸tmpObj作为新的AppData tmpObj.No=rdr（“No”）.ToString（） tmpObj.Template=templa8 FPList.Add（tmpObj）