SelectMode Enumeration

Definition

public enum class SelectMode

public enum SelectMode

type SelectMode = 

Public Enum SelectMode

Vererbung

Object

ValueType

Enum

SelectMode

Felder

Beispiele

Im folgenden Beispiel wird der Status eines Socket mit allen drei SelectMode Enumerationswerten überprüft.The following example checks the status of a Socket using all three SelectMode enumeration values. Ein-Befehl Socket.Poll , der den SelectWrite-Enumerationswert verwendet, sollte zurückgeben. trueA call to Socket.Poll using the SelectWrite enumerated value should return true.

//Creates the Socket for sending data over TCP.
Socket^ s = gcnew Socket( AddressFamily::InterNetwork, SocketType::Stream,
   ProtocolType::Tcp );

// Connects to host using IPEndPoint.
s->Connect( EPhost );
if ( !s->Connected )
{
   strRetPage = "Unable to connect to host";
}
// Use the SelectWrite enumeration to obtain Socket status.
if ( s->Poll( -1, SelectMode::SelectWrite ) )
{
   Console::WriteLine( "This Socket is writable." );
}
else if ( s->Poll(  -1, SelectMode::SelectRead ) )
{
   Console::WriteLine( "This Socket is readable." );
}
else if ( s->Poll(  -1, SelectMode::SelectError ) )
{
   Console::WriteLine( "This Socket has an error." );
}

   //Creates the Socket for sending data over TCP.
   Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream,
      ProtocolType.Tcp );

   // Connects to host using IPEndPoint.
   s.Connect(EPhost);
   if (!s.Connected)
   {
      strRetPage = "Unable to connect to host";
   }
   // Use the SelectWrite enumeration to obtain Socket status.
    if(s.Poll(-1, SelectMode.SelectWrite)){
         Console.WriteLine("This Socket is writable.");
    }
    else if (s.Poll(-1, SelectMode.SelectRead)){
          Console.WriteLine("This Socket is readable." );
    }
    else if (s.Poll(-1, SelectMode.SelectError)){
         Console.WriteLine("This Socket has an error.");
    }

'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.")
Else
   If s.Poll(- 1, SelectMode.SelectRead) Then
      Console.WriteLine(("This Socket is readable. "))
   Else
      If s.Poll(- 1, SelectMode.SelectError) Then
         Console.WriteLine("This Socket has an error.")
      End If
   End If 
End If 

Hinweise

Die SelectMode -Enumeration definiert die Abruf Modi, die an die Socket.Poll -Methode übermittelt werden können.The SelectMode enumeration defines the polling modes that can be passed to the Socket.Poll method. Verwenden Sie den SelectRead-Wert, um zu Socket bestimmen, ob ein lauschen über eingehende Verbindungsanforderungen verfügt.Use the SelectRead value to determine if a listening Socket has incoming connection requests. Verwenden Sie den SelectWrite-Wert, um Socket zu bestimmen, ob ein beschreibbar ist.Use the SelectWrite value to determine if a Socket is writeable. Verwenden Sie den SelectError-Wert, um zu bestimmen, ob eine Fehlerbedingung Socketin vorhanden ist.Use the SelectError value to determine if there is an error condition present on the Socket. Erläuterungen zur Beschreib barkeit, Lesbarkeit und zum vorhanden sein von Fehlerbedingungen finden Sie unter der Socket.Poll -Methode.For explanations of writeability, readability, and the presence of error conditions, see the Socket.Poll method.

Gilt für:

Siehe auch

• Poll(Int32, SelectMode)
• Select(IList, IList, IList, Int32)