'Creates the Socket for sending data over TCP.
Dim s As New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
' Connects to host using IPEndPoint.
s.Connect(EPhost)
If Not s.Connected Then
strRetPage = "Unable to connect to host"
End If
' Use the SelectWrite enumeration to obtain Socket status.
If s.Poll(- 1, SelectMode.SelectWrite) Then
Console.WriteLine("This Socket is writable.")
If s.Poll(- 1, SelectMode.SelectRead) Then
Console.WriteLine(("This Socket is readable. "))
If s.Poll(- 1, SelectMode.SelectError) Then
Console.WriteLine("This Socket has an error.")
End If
End If
End If
Socket
必须先使用 、
AddressFamily
a
SocketType
和 a
ProtocolType
创建数据,然后才能发送和接收数据。 枚举
SocketType
提供了多个选项,用于定义要打开的类型
Socket
。
SocketType
有时隐式指示在
ProtocolType
一个
AddressFamily
. 例如,当为
System.Net.Sockets.SocketType
SocketType.Dgram
时,
System.Net.Sockets.ProtocolType
始终
ProtocolType.Udp
为 。 当是
System.Net.Sockets.SocketType
SocketType.Stream
时,
System.Net.Sockets.ProtocolType
始终
ProtocolType.Tcp
是。 如果尝试使用不兼容的组合创建一个
Socket
,
Socket
将引发一个
SocketException
。