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vb.nettcp资料 vbnet ui
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VB.Net 关于路由器后TCP或UDP通讯问题 假设一台电脑192.168.0.1位于路由1.
端口不NATvb.nettcp资料,两个子网中vb.nettcp资料的两端之间不可能通信。至少要有一方处在公网下或有路由端口映射,不必双方都映射。
建议题主找本计算机网络的书研读一下子网划分这块儿。
VB.NET 2003中 想做一个基于TCP/IP的网络通信程序
就可以了,我有一段不太成熟的代码:
Imports System.Net
Imports System.Net.Sockets
Imports System.Threading
Imports System.IO
Public Class Form1
Dim TCPListenerRun, TCPClientRun As Boolean
Dim ControlTCPClient, ServerClient As TcpClient
Dim ControlTCPListener As TcpListener
Dim TCPClientT, TCPListenerT As Thread
Private ControlStream, SControlStream As NetworkStream
Private ControlReadStream, SControlReadStream As StreamReader
Private ControlWriteStream, SControlWriteStream As StreamWriter
'异步委托
Private Delegate Sub InvokeDelegate(ByVal iMessage As String)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Try
If TCPListenerRun Then
TCPListenerT.Abort()
ControlTCPListener.Stop()
TCPListenerRun = False
Button1.Text = "启动服务端 "
TextBox2.AppendText( "服务器已停止! " vbCrLf)
Else
ControlTCPListener = New TcpListener(IPAddress.Parse( "127.0.0.1 "), 13000)
ControlTCPListener.Start()
TCPListenerT = New Thread(AddressOf Listen)
TCPListenerT.Start()
TextBox2.AppendText( "等待连接... " vbCrLf)
TextBox2.AppendText( "服务器已启动! " vbCrLf)
TCPListenerRun = True
Button1.Text = "停止服务端 "
End If
Catch ex As Exception
TextBox2.AppendText(ex.Message vbCrLf)
End Try
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Try
If TCPClientRun Then
TCPClientT.Abort()
ControlTCPClient.Close()
TCPClientRun = False
Button2.Text = "启动客户端 "
Else
ControlTCPClient = New TcpClient(New IPEndPoint(IPAddress.Parse( "127.0.0.1 "), 13001))
ControlTCPClient.Connect(New IPEndPoint(IPAddress.Parse( "127.0.0.1 "), 13000))
TCPClientRun = True
Button2.Text = "停止客户端 "
TCPClientT = New Thread(AddressOf Receive)
TCPClientT.Start()
ControlStream = ControlTCPClient.GetStream()
ControlReadStream = New StreamReader(ControlStream)
ControlWriteStream = New StreamWriter(ControlStream)
End If
Catch ex As SocketException
'If ex.ErrorCode = 10048 Then
ControlTCPClient.Close()
'End If
TCPClientRun = False
Button2.Text = "启动客户端 "
TextBox2.AppendText(ex.Message vbCrLf)
End Try
End Sub
Private Sub Listen()
ServerClient = ControlTCPListener.AcceptTcpClient
TextBox2.BeginInvoke(New InvokeDelegate(AddressOf InvokeMethod_Receive), "成功连接... ")
SControlStream = ServerClient.GetStream()
SControlReadStream = New StreamReader(SControlStream)
SControlWriteStream = New StreamWriter(SControlStream)
While True
TextBox2.BeginInvoke(New InvokeDelegate(AddressOf InvokeMethod_Receive), SControlReadStream.ReadLine())
End While
End Sub
Private Sub Receive()
While True
TextBox2.BeginInvoke(New InvokeDelegate(AddressOf InvokeMethod_Receive), ControlReadStream.ReadLine())
'Console.WriteLine(ControlTCPClient.Available)
End While
End Sub
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
TCPListenerRun = False
TCPClientRun = False
End Sub
Private Sub InvokeMethod_Receive(ByVal iMessage As String)
TextBox2.AppendText(iMessage vbCrLf)
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
ControlWriteStream.WriteLine(TextBox1.Text)
ControlWriteStream.Flush()
End Sub
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
SControlWriteStream.WriteLine(TextBox3.Text)
SControlWriteStream.Flush()
End Sub
End Class
VB.NET 如何通过TCP/IP协议通讯实现16进制数据的接收?
传输Integer 数据类型来传输比较方便.因为Integer 的取值可以是0x0000-0xFFFF .当你把数据发送到目的主机后可以利用Hex() 把接收到的数据从十进制转换到十六进制..
vb.net TCP协议服务端ip怎么写才能使客户端能通过公网连接进来?
需要出口设备进行映射内部地址;或使用打洞技术穿透NAT,但使用TCP打洞非常困难。
参考
穿透NAT是非常困难的,因为NAT的过程中在出口路由器上的Port已经不是你定义的iPort了,具体是多少也不固定
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