TWSocketServer

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Overview

unit		WSocketS.pas
inheritance		TWSocket

TWSocketServer will normally be used to listen on a given TCP port. When a client connects, it will instantiate a new TWSocketClient component to handle communication with client. Normally you will derive your own component from TWSocketClient to add private data and methods to handle your processing needs. You tell TWSocketServer which component class it has to instantiate using ClientClass property. You have to initialize each instance created to handle each client from OnClientConnect event handler. TWSocketServer maintain a list of connected clients. You can access it using Client[] indexed property. ClientCount property is the size of Client[] array.

Since it is derived from TWSocket, lots of properties and events are unused and not listed here. Properties and events that have a meaning in both server or client component are listed here.

Note that TWSocketServer is only usable for incoming TCP connections. Use TWSocket if you need to use UDP.

Note: When a TWSocketClient is closed, it automatically frees itself. With a normal TWSocket, the programmer is responsible for freeing the object.

Properties

Addr		The interface to listen on.
Banner		A short message line sent when each client connects.
BannerTooBusy		A short message sent when a client connects and the number of clients already exceeds the MaxClients limit.
Client		Indexed property giving access to all connected clients.
ClientClass		Class the component use to handle each incoming connection.
ClientCount		Number of connected clients.
Handle		Handle of the hidden window used for socket operation.
HSocket		Underlying winsock socket handle.
LastError		Last error which occurred.
ListenBacklog		How many pending connection the system has to accept before denying access.
MaxClients		Max number of connected client. All subsequent connections will be closed.
Port		TCP port or service name to listen to.
PortNum		Readonly property with numeric value corresponding to Port.
Proto		Protocol used. Must be 'tcp'.
State		Gives the state of the component.

Methods

Abort		Abort current asynchronous operation.
Close		Stops listening, does not disconnect connected clients.
CloseDelayed		Same as Close however it's executed delayed, after current event has finished.
Create		Create a new instance of the component.
Destroy		Destroy the current instance.
IsClient		Check if a component reference is one of the connected clients.
Listen		Start accepting connections.
MessageLoop		Internal message loop.
MessagePump		Internal message pump.
ProcessMessage		Process a single message.
ProcessMessages		Process messages until message queue is empty.
Release		Destroy the current instance after the current event is terminated.
ThreadAttach		Detach from current thread.
ThreadDetach		Attach to current thread.

Events

OnBgException		When a background exception occurs.
OnChangeState		When the component state change.
OnClientConnect		When a new client is connecting.
OnClientCreate		When a new client component instance is created.
OnClientDisconnect		When a client disconnect.
OnError		When an error occur. Better to use exception handling.
OnMessagePump		To call your own external message pump instead of built-in one.

How to

• Stop accepting connections

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