vb点虐 如何获取某个进程的UDP连接信息（要有目标ip和port）

private void MyPrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)

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public static boolean isNumeric(String str){

if(str.matches("//d*"){

return true;

}else{

return false;

}

}

VB.NET如何判断电脑是否已连接到网络？

Microsoft.VisualBasic.Devices.Network.IsAvailable As Boolean

生成实例后可以通过此属性来获取是否联网的值，True代表已联网，False代表没有联网

Microsoft.VisualBasic.Devices.Network.NetworkAvailabilityChanged(ByVal Object, ByVal Microsoft.VisualBasic.Devices.NetworkAvailableEventArgs)

该事件是在电脑断开/连上互联网是引发的

其中：

e.IsNetworkAvailable

的功能同Microsoft.VisualBasic.Devices.Network.IsAvailable

实例:

Dim netListener As New Microsoft.VisualBasic.Devices.Network '生成实例

If netListener.IsAvailable = True Then

MsgBox("已联网")

Else

MsgBox("未联网")

End If

NetworkAvailabilityChanged实例：

WithEvents netListener As New Microsoft.VisualBasic.Devices.Network '生成实例

Private Sub OnNetworkChanged(ByVal Object, ByVal Microsoft.VisualBasic.Devices.NetworkAvailableEventArgs)Handles netListener.NetworkAvailabilityChanged

If e.IsNetworkAvailable = True Then

MsgBox("已联网")

Else

MsgBox("未联网")

End If

End Sub

vb点虐 应用程序 局域网运用

用WebService或者Remoting，提交服务器处理

___________________________

只要你的并发数并不大，sqlserver有并发控制，更新数据时会锁住

用vb点虐 实现网络通信

用 vb点虐 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

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