System.Net.Socket.TSocket.Select

• Up to Parent: TSocket

Delphi

class function Select(const CheckRead, CheckWrite, CheckError: PFDSet; Microseconds: Int64): TWaitResult; static;

C++

static System::Types::TWaitResult __fastcall Select(const PFDSet CheckRead, const PFDSet CheckWrite, const PFDSet CheckError, __int64 Microseconds);

Properties

Type	Visibility	Source	Unit	Parent
function	public	System.Net.Socket.pas System.Net.Socket.hpp	System.Net.Socket	TSocket

Description

Check multiple socket instances for read or write readiness or error state.

Select receives the following parameters:

• CheckRead are sockets to check for read readiness.
• CheckWrite are sockets to check for write readiness.
• CheckError are sockets to check for error state.
• Microseconds is the maximum time for Select to wait, in microseconds.

Select returns wrTimeout if the specified time limit expired or wrSignaled otherwise.

Exceptions

A call to Select can raise any of the following exceptions:

Exception	Exception.Message	Scenarios
ESocketError	Network socket error: <error message> (<error code>), on API 'select'	The operating system reported an error while monitoring local sockets. For more information, see the following documentation for the operating system where your application was running: Windows: select function (MSDN) OS X: select (OS X Man Pages) iOS: select (iOS Manual Pages) Android: select (Linux Programmer's Manual)

See Also

• System.Net.Socket.PFDSet
• System.Types.TWaitResult

• System.Net.Socket.TSocket.WaitForData

• select function (MSDN)