用vb.net实现网络通信

用 vb.net socket通信

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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

vb.net UdpClient怎样及时的接收数据

另起一个线程，在里面循环receive，每收到一个数据就进行分析，特殊命令如exit,执行udpclient.close()，其他数据委托到主线程。

VB.NET 如何获取网页中的数据

Public Function webCaptureContent(ByVal mWebsiteUrl As String, ByVal mWebsiteType As Boolean) As String

'启动一次具体的数据采集工作,返回采集到的HTML内容:要求必须输入带://的全地址数据

On Error Resume Next

Dim Str_WebContent As String = "请输入查找网站地址."

Dim wb As WebClient = New WebClient() '//创建一个WebClient实例

If mWebsiteUrl.IndexOf("://") 0 Then

'//获取或设置用于对向 Internet 资源的请求进行身份验证的网络凭据。（可有可无）

wb.Credentials = CredentialCache.DefaultCredentials

'//从资源下载数据并返回字节数组。（加@是因为网址中间有"/"符号）

Dim pagedata As Object = wb.DownloadData(mWebsiteUrl)

'//转换字符

If mWebsiteType Then

Str_WebContent = Encoding.Default.GetString(pagedata)

Else

Str_WebContent = Encoding.UTF8.GetString(pagedata)

End If

End If

Return Str_WebContent '提取出来新闻内容,删除Body前后的多余内容,同时补充上该 Body标记,形成完整的内容 Str_WebContent '

End Function

VB.NET接收串口数据问题

不知道你是不是用51单片机往串口发数据，是的话那是因为51的SBUF最多存放8个字节，所以你发12个字节会分成两次发完。还有在接收的时候最好定义好通信协议，比如加一个侦头，一个侦尾，通过这两个字节的内容来接收数据。

老兄，提问还是给点悬赏分嘛，不要吝啬哪点分，知识是无价的，你给得越多，回答你的人才会越多。

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