我正在尝试构建一个简单的聊天客户端/软件(整个可执行文件),它从端口 5900 开始监听,当客户端连接到该端口时,聊天就建立了。
问题是只有客户端可以与服务器聊天,服务器无法回答客户端,因为连接以一种方式工作。
我尝试在建立连接时从“服务器”连接到客户端,但系统崩溃警告我该端口已在使用中。
这是我的代码:(以一种方式工作)
Imports System.Net.Sockets
Imports System.Text
Imports System.Reflection
Public Class frmComplete
Dim Data As Integer
Dim Message As String
Private sServer As TcpListener
Private sClient As New TcpClient
Private cServer As TcpListener
Private cClient As New TcpClient
Private cNick As String
Dim BufferSize(1024) As Byte
Private Delegate Sub MessageDelegate(ByVal Message As String)
Private Sub frmComplete_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
srvListen(5900)
btnSend.Enabled = False
End Sub
Private Sub OnServerConnect(ByVal AR As IAsyncResult)
sClient = sServer.EndAcceptTcpClient(AR)
sClient.GetStream.BeginRead(BufferSize, 0, BufferSize.Length, AddressOf OnRead, Nothing)
My.Computer.Audio.Play(Application.StartupPath & "\Connected.wav", AudioPlayMode.Background)
End Sub
Private Sub OnRead(ByVal AR As IAsyncResult)
Data = sClient.GetStream.EndRead(AR)
Message = Encoding.ASCII.GetString(BufferSize, 0, Data)
Dim Args As Object() = {Message}
Me.Invoke(New MessageDelegate(AddressOf PrintMessage), Args)
sClient.GetStream.BeginRead(BufferSize, 0, BufferSize.Length, AddressOf OnRead, Nothing)
End Sub
Private Sub PrintMessage(ByVal Message As String)
Try
txtChat.Text = txtChat.Text & Message & vbCrLf
My.Computer.Audio.Play(Application.StartupPath & "\Message.wav", AudioPlayMode.Background)
Catch ex As Exception
MsgBox(ex.Message, MsgBoxStyle.Critical)
End Try
End Sub
Private Sub srvListen(ByVal port As Integer)
Try
sServer = New TcpListener(System.Net.IPAddress.Any, 5900)
sServer.Start()
'THIS WILL RAISE THE EVENT WHEN A CLIENT IS CONNECTED
sServer.BeginAcceptTcpClient(AddressOf OnServerConnect, Nothing)
Catch ex As Exception
MsgBox(ex.Message, MsgBoxStyle.Critical)
End Try
End Sub
Private Sub txtMessage_KeyDown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles txtMessage.KeyDown
'FIXME (SOUND T_T)
If e.KeyCode = Keys.Enter Then
SendMessage(cNick & ":" & txtMessage.Text)
End If
End Sub
Private Sub btnConnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnConnect.Click
ConnectToServer(txtIP.Text)
cNick = txtNickname.Text
txtNickname.Enabled = False
txtIP.Enabled = False
btnConnect.Enabled = False
End Sub
Private Sub ConnectToServer(ByVal ipadress As String)
Try
cClient.BeginConnect(ipadress, 5900, AddressOf OnClientConnect, Nothing)
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
Private Sub OnClientConnect(ByVal AR As IAsyncResult)
Try
cClient.EndConnect(AR)
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
Private Sub btnSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSend.Click
If Not String.IsNullOrEmpty(txtMessage.Text) Then
txtChat.Text = txtChat.Text & "Me:" & txtMessage.Text & vbCrLf
SendMessage(cNick & ":" & txtMessage.Text)
End If
End Sub
Private Sub SendMessage(ByVal message As String)
If cClient.Connected = True Then
Dim Writer As New IO.StreamWriter(cClient.GetStream)
Writer.Write(message)
Writer.Flush()
End If
txtMessage.Text = ""
End Sub
Private Sub SendCommand(ByVal command As String)
If cClient.Connected = True Then
Dim Writer As New IO.StreamWriter(cClient.GetStream)
Writer.Write(command)
Writer.Flush()
End If
txtMessage.Text = ""
End Sub
Private Sub txtMessage_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtMessage.TextChanged
If Not String.IsNullOrEmpty(txtMessage.Text) Then
btnSend.Enabled = True
Else
btnSend.Enabled = False
End If
End Sub
End Class
我该做什么?使用两个端口?一个写一个读?如果我需要将多个客户端连接到一个用户?(记住同一个exe是服务器/客户端)
请帮帮我=(