从客户端获取真正的字符串到服务器 vb.net

Question

listener = New TcpListener(System.Net.IPAddress.Any, portconnect)
    listener.Start()
    client = listener.AcceptTcpClient
    loginInfo = receivedata()
    Dim array() As String
    array = loginInfo.Split("|")
    username = array(0)
    pass = array(1)

客户端发送到服务器的信息是登录信息。我将 logininfo 输入用户名和密码。

Public Function authentication(ByVal user As String, ByVal pass As String) As Boolean
        Dim authentica As Boolean = False
        Dim con As New OleDbConnection
    Try
        con.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" & "  data source= " & Application.StartupPath & "\" & dataName

        Dim myCommand As OleDbCommand = con.CreateCommand()
        Dim sqlstr As String = ""
        sqlstr = "Select password from tbusers where Username = " & "'" & user & "'"
        myCommand.CommandText = sqlstr
        con.Open()
        Dim passw As String
        passw = myCommand.ExecuteScalar()
        con.Close()
        If pass = passw Then
            authentica = True
        End If

    Catch ex As Exception
        MsgBox(ex.ToString)
    End Try
    Return authentica
End Function

问题是：If pass = passw Then authentica = True End If 总是返回 false。 请帮忙

Answer 1

如果管道字符'|'总是将用户名和密码分开，分开：

Dim str As String = "username|password"
Dim splitString() As String = str.Split("|")
Dim userName As String = splitString(0)
Dim password As String = splitString(1)

正如您所提到的，如果用户名的长度不同（很可能会！），您将需要一些常量作为拆分的基础。

但是你最好还是分开用户名和密码，这样它们就可以独立访问了。

Answer 2

您可以使用Split function

Dim str as String = "username|password"

Debug.writeline("Username is " + str.Split("|"c)(0))
Debug.writeline("Password is " + str.Split("|"c)(1))

以这种方式发送这些似乎是个坏主意。例如：如果密码中包含竖线字符会怎样？