我想用winsock创建一个应用服务器。 我不知道如何确定端口是否打开
With AxWinsock1
.LocalPort = TextBox1.Text
.Listen()
End With
答案 0 :(得分:1)
如果感兴趣,这是一个很好的网站,可以帮助您开始使用VB.NET进行Socket编程: http://vb.net-informations.com/communications/vb.net_socket_programming.htm
要检查端口是否已打开,您可以尝试连接到该端口,如果它抛出SocketException
,您可以认为该端口已关闭。
Dim host As String = "localhost"
Dim port As Integer = 23112
Dim addr As IPAddress = DirectCast(Dns.GetHostAddresses(host)(0), IPAddress)
Try
Dim tcpList As New TcpListener(addr, port)
tcpList.Start()
Catch sx As SocketException
'Catch exception - No available port
End Try