vb.nettcp网络 nettcpip

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NAT,两个子网中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。

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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 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

用vb.net实现网络通信

用 vb.net socket通信

Dim th As Threading.Thread

2 Dim tcpl As System.Net.Sockets.TcpListener

3

4 Private Sub Form1_Load()Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

5 th = New System.Threading.Thread(New System.Threading.ThreadStart(AddressOf MyListen))

6 th.Start()

7 End Sub

8

9 Public Sub SendMessage()Sub SendMessage(ByVal IP As String, ByVal SendMsg As String)

10 Try

11 If IP "" Then

12 Dim tcpc As New System.Net.Sockets.TcpClient(IP, 5656)

13 Dim tcpStream As Net.Sockets.NetworkStream = tcpc.GetStream

14 Dim reqStream As New IO.StreamWriter(tcpStream)

15 reqStream.Write(SendMsg)

16 reqStream.Flush()

17 tcpStream.Close()

18 tcpc.Close()

19 End If

20 Catch ex As Exception

21 MsgBox(ex.Message.ToString)

22 End Try

23 End Sub

24 Private Sub MyListen()Sub MyListen()

25 Try

26 Dim ipAddress As System.Net.IPAddress = System.Net.Dns.Resolve(System.Net.Dns.GetHostName).AddressList(0)

27 tcpl = New System.Net.Sockets.TcpListener(ipAddress, 5656)

28 tcpl.Start()

29 While True

30 Dim s As System.Net.Sockets.Socket = tcpl.AcceptSocket()

31 Dim MyBuffer(1024) As Byte

32 Dim i As Integer

33 i = s.Receive(MyBuffer)

34 If i 0 Then

35 Dim lstrRec As String

36 Dim j As Integer

37 For j = 0 To i - 1

38 TextBox1.Text += Chr(MyBuffer(j)) ","

39 Next

40 End If

41 End While

42 Catch ex As Exception

43 MsgBox(ex.Message.ToString)

44 End Try

45 End Sub

46

47 Private Sub Button1_Click()Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

48 SendMessage("192.168.0.61", TextBox2.Text)

49 End Sub

求 VB.Net的TCP/IP通讯实例,最好包括客户端请求连接与处理来自服务器的响应相关代码

服务器和客户端都有,但是都是很基本的代码,可以作为参考学习。。。


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