从客户端到服务器vb.net获取真正的字符串

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)

Info client send to server is logininfo. I slipt logininfo into username and password.

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

Problem is: If pass = passw Then authentica = True End If Allways return false. Please help

Answer 1

If the pipe character '|' always separates the user name and password, split on that:

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

As you mentioned if the length of the username differs (as it most likely will!) you will need something constant to be the basis for the split.

But you are better off separating the username and password anyway so they can be accessed independently.

Answer 2

You can use the Split function

Dim str as String = "username|password"

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

This seems like a bad idea to send these in this way. For example: what happens if the password contains the pipe character?