登录表格问题 [英] Login Form Problem

问题描述

我正在制作一个登录屏幕，它将能够检查文件是否存在并抛出错误消息.问题是，如果我使用(<> = True)，即使文件不存在，它也会引发错误消息.如果我仅使用(= True)，则根本不会引发错误消息.以下是我正在使用的代码.提前谢谢.

Hi, I''m making a login screen that will be able to check to see if a file exists and throw an error message. The problem is that if I use (<> = True), even if the file does not exist it throws the error message. If I use just (= True) it does not throw error message at all. Below is the code I''m using. Thanks in advance.

Private Sub btnCreateUser_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCreateUser.Click
        Dim namefile As String
        namefile = txtCUserName.Text
        If namefile = "" Then
            MsgBox("Please Enter A Username")
            txtCPassword.Focus()
        Else : If txtCPassword.Text = "" Then
                MsgBox("Please Enter A Password")
            Else : If My.Computer.FileSystem.DirectoryExists("C:\AccountUsers\") Then
                Else
                    MkDir("C:\AccountUsers\")
                End If
            End If
        End If
        If My.Computer.FileSystem.FileExists("/txtCUserName.txt") <> True Then
            MsgBox("Account Already Exists, Use A Different Username Or Login", MsgBoxStyle.Information)
            txtCUserName.Text = ""
            txtCPassword.Text = ""
            txtCUserName.Focus()
        Else
            FileOpen(1, "C:\AccountUsers\" + namefile + ".txt", OpenMode.Output, OpenAccess.Write)
            PrintLine(1, txtCUserName.Text)
            PrintLine(1, txtCPassword.Text)
            FileClose(1)
            txtCUserName.Text = ""
            txtCPassword.Text = ""
            txtCUserName.Focus()
        End If
    End Sub

推荐答案

首先，当您执行此类操作时，应指定完整的限定路径.其次，请尝试以下操作:

First, you should specify the entire qualified path when you''re doing something like this., Second, try this:

If My.Computer.FileSystem.FileExists("/txtCUserName.txt") Then
...
else
...
end if

前行在FileExists参数中斜线("/")并完全丢失<> True"部分.

这是什么?您是在将用户名和密码写成纯文本格式的文本文件吗?如果您这样做，则似乎不必担心安全性.

Get ride of the forward slash ("/") in the FileExists parameter and lose the "<> True" part entirely.

What is this? You''re writing the users name and password into a text file in clear text?? Security doesn''t seem to be a worry if you''re doing this.

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