Question

 Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    Dim FILE_NAME As String = Cashierpath
    System.IO.File.Exists(FILE_NAME) ' current
    Dim objReader As StreamReader
    Dim user As String = TextBox1.Text
    Dim password As String = TextBox2.Text
    Dim check As String


    'Global Variable
    'Dim DirPath7 As String = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "Scrap Data\Cashier Info\Cashiers\")

    For Each filename As String In IO.Directory.EnumerateFiles(DirPath7, "*.txt")
        Dim fName As String = IO.Path.GetFileName(filename)
        If user = fName & ".txt" Then
            objReader = New StreamReader(fName)
            check = objReader.ReadToEnd()
            If password = check Then
                MessageBox.Show("Welcome " & user & "!")
                Close()
                My.Forms.Home.Show()
            Else
                MessageBox.Show("Username or Password is incorrect")

            End If
        End If
    Next
End Sub

当用户在文本框中输入“用户名”和“密码”，然后单击此按钮时，我希望此按钮检查是否有输入用户名的文本文件，以及是否有文件那个用户名必须读取它并检查密码是否与文件中的字符串匹配。如果它不匹配，它必须显示一个消息框，说“用户名或密码不正确”，但是当我点击这个按钮时没有任何反应。也没有出现错误消息。有人可以看看我的代码并告诉我我做错了什么？

Answer 1

您所拥有的是一种处理用户凭据的糟糕方式！

阅读本文以获取更多信息：Salted Password Hashing - Doing it Right

无论如何，你过度编码了。

在你的应用程序的其他地方（正确使用Combine）：

' Global Variable
Friend Shared DirPath7 As String = IO.Path.Combine(My.Computer.FileSystem.SpecialDirectories.MyDocuments, "Scrap Data", "Cashier Info", "Cashiers")

按钮处理程序：

Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    Dim User As String = TextBox1.Text.Trim
    Dim Pass As String = TextBox2.Text.Trim

    ' Assemble the full expected file path, even if it might be malformed.
    ' The first case check protects against malformed path.
    Dim FilePath As String = IO.Path.Combine(DirPath7, String.Format("{0}.txt", User))

    Select Case True
        Case User.Length = 0
            MsgBox("Username is empty", vbExclamation, "Error")
        Case Pass.Length = 0
            MsgBox("Password is empty", vbExclamation, "Error")
        Case Not IO.File.Exists(FilePath)
            MsgBox("No file for User", vbExclamation, "Error")
        Case Not IO.File.ReadAllText(FilePath) = Pass
            MsgBox("Wrong Password", vbExclamation, "Error")
        Case Else
            MsgBox(String.Format("Welcome {0}!", User), vbOKOnly, "Success")
            My.Forms.Home.Show()
    End Select
End Sub

Answer 2

Dim objReader As StreamReader
    Dim user As String = TextBox1.Text
    Dim password As String = TextBox2.Text
    Dim check As String

    Dim fname = Path.Combine(DirPath7, String.Format("{0}.txt", user))
     If File.Exists(fname) Then
        Using objreader As New StreamReader(fname)
            'objReader = StreamReader(fname)
            check = objreader.ReadToEnd()
            password = check
            MessageBox.Show("Welcome " & user & "!")
            Close()
            My.Forms.Home.Show()
        End Using
    Else : MessageBox.Show("file not found, no user exists")
    End If

删除了额外的“。txt”

添加“使用”。。。“结束使用”

不从文本文件中获取用户名和密码

2 个答案: