TWSocket

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Overview

unit		WSocket.pas
inheritance

TWSocket component is implementing the TCP protocol described in RFC 793 and and UDP protocol described in RFC 768. Both protocols are encaptulated by the IP protocol described in RFC 791. TWSocket is used in almost every other ICS component.

TWSocket component can be used as client or a server. For its use as TCP server however TWSocketServer is encouraged because of his advanced features.

Properties

Addr		Client: The host to connect to. Server: The interface to listen on.
AllSent
BufSize		Size in bytes for dynamic send buffer cells.
ComponentOptions		Used to modify how the component handle some operations.
DnsResult		Typically called in OnDnsLookupDone. The IP address of the remote host given as argument to DnsLookup.
DnsResultList		Similar to DnsResult but a TStringList containing the multiple IP's of the host if appropriate.
Handle		Handle for the underlaying hidden window.
HSocket		Winsock handle for underlaying socket.
IcsLogger		Linked component to log debug messages.
LastError		Save the last error occured during socket operation.
LineEcho		Echo all received characters back to transmitter.
LineEdit		Handle received control characters used for editing.
LineEnd		End of line character(s) used ot trigger OnDataAvailable.
LineLength		When using LineMode: the length of the received line.
LineLimit		Maximum line lenght to receive before triggering OnLineLimitExceeded. See also DOS attac.
LineMode		Use LineEnd as end of line marker to trigger OnDataAvailable.
LingerOnOff		Select linger mode.
LingerTimeout		Select linger timeout.
ListenBacklog		Size of pending connection queue in server mode.
LocalAddr		The local address where the socket is bound to.
LocalPort		The local port where the socket is bound to.
MultiCast		Select multicast.
MultiCastAddrStr		Select multicast address.
MultiCastIpTTL		Select multicast Time To Live.
MultiThreaded		Set when TWSocket has to use his own message pump.
PeerAddr		The remote address where the socket is bound to.
PeerPort		The remote port port where the socket is bound to.
Port		Client: The port to connect to. Server: The port to listen on.
PortNum		Integer value of Port.
Proto		The protocol to use, can be tcp or tcp.
RcvdCnt		Number of character received in internal buffer when using line mode.
RcvdCount		Number of characters in receive buffer but not read yet.
RcvdPtr		Internal rceive buffer pointer used for line mode.
ReadCount		Total number of bytes received.
ReqVerLow		Low part of winsock version to load.
ReqVerHigh		High part of winsock version to load.
ReuseAddr		Should the compnent try to reuse an address.
SendFlags		How to send data.
SocksAuthentication		Select socks server authentication mode.
SocksLevel		Select socks server protocol level.
SocksPassword		Password for socks server authentication.
SocksPort		Port number for socks server.
SocksServer		IP or hostname for socks server.
SocksUsercode		Usercode for socks server authentication.
State		Current state of the socket, mainly used for log or display purposes.
Terminated		To be set to terminate synchronous operation prematurely.
Text		Equivalent to ReceiveStr and SendStr.

Methods

Abort		Quick and dirty way to close the socket.
Accept		Accept a new connection.
CancelDnsLookup		Cancel any pending DNS lookup.
Close		Close the socket gracefull.
CloseDelayed		Close the socket when the current event terminate.
Connect		Connect to a remote host.
Create		Dynamcly create the component.
DeleteBufferedData		Delete internaly buffered data.
Destroy		Destroy the dynamicly created component.
DnsLookup		Perform a DNS lookup of a hostname in background. See also OnDNSLookupDone.
Dup		Assign a socket handle to the component.
Flush		Wait until the internal buffer is flushed. Better to avoid this method.
GetPeerAddr		Returns the remote address where the socket has been bound. See also PeerAddr.
GetPeerName		Returns the remot hostname where the socket has been bound.
GetPeerPort		Returns the remote port where the socket has been bound. See also PeerPort.
GetSockName
GetXAddr		Returns the local interface to where the socket has been bound.
GetXPort		Returns the local port to where the socket has been bound.
Listen		Set the socket in listening state to accept inbound connections.
MessageLoop		Pump messages until WM_QUIT is received.
MessagePump		Trigger OnMessagePump or call ProcessMessages.
Pause		Stop delivery notification of received TCP data.
PeekData
ProcessMessage		Similar as TApplication.ProcessMessage.
ProcessMessages		Similar as TApplication.ProcessMessages.
PutDataInSendBuffer		Put data in send buffer without sending it.
PutStringInSendBuffer		Put string in send buffer without sending it.
Receive		Receive data (to be called from OnDataAvailable).
ReceiveFrom		Same as Receive but returns the sender address.
ReceiveStr		Receive string (To be called from OnDataAvailable).
Release		Destroy the dynamicly created TWSocket in a custom message handler.
Resume		Resume winsock event notifications.
ReverseDnsLookup
Send		Send data.
SendStr		Send a string.
SendTo		Send data to a given remote (UDP).
SetLingerOption
Shutdown		Close the socket gracefull.
TimerClear
TimerCmp
TimerIsSet
ThreadAttach		Attach to the current thread.
ThreadDetach		Detach from the current thread.
WaitForClose		Wait until the socket is closed. Better to avoid this method.

Events

OnBgException		Background exception occured.
OnChangeState		State of TWSocket has changed.
OnDataAvailable		Data available in internal receive buffer.
OnDataSent		Internal sent buffer is completely delivered to winsock.
OnDebugDisplay
OnDnsLookupDone		DNSLookup has finished.
OnError		Discouraged, use exception handling instead.
OnLineLimitExceeded		Denial of service attack
OnMessagePump		To call your own message pump.
OnSendData		Winsock send buffer is empty, will be filled again by internal send buffer if still data available to send.
OnSessionAvailable		Client connected to this server.
OnSessionClosed		Socket has closed.
OnSessionConnected		Session to host etablished.
OnSocksAuthState
OnSocksConnected
OnSocksError

How to

• Close a TCP session
• Destroy a dynamicly created TWSocket

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ICS Components Reference