{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Author: Fran鏾is PIETTE
Object: Demo program to show how to use TWSocket object is a very
simple server program. This server just wait for a client to
connect, then send 'Hello'. When the user click on the
disconnect button, the client is disconnected.
Creation: September 19, 1996
Version: 2.02
EMail: francois.piette@overbyte.be http://www.overbyte.be
Support: Use the mailing list twsocket@elists.org
Follow "support" link at http://www.overbyte.be for subscription.
Legal issues: Copyright (C) 1996-2010 by Fran鏾is PIETTE
Rue de Grady 24, 4053 Embourg, Belgium. Fax: +32-4-365.74.56
<francois.piette@overbytet.be>
This software is provided 'as-is', without any express or
implied warranty. In no event will the author be held liable
for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any
purpose, including commercial applications, and to alter it
and redistribute it freely, subject to the following
restrictions:
1. The origin of this software must not be misrepresented,
you must not claim that you wrote the original software.
If you use this software in a product, an acknowledgment
in the product documentation would be appreciated but is
not required.
2. Altered source versions must be plainly marked as such, and
must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source
distribution.
Updates:
Mar 19, 1997 Use enhanced TWSocket object
Sep 06, 1997 Beautified
Aug 20, 1999 V2.02 Changed comment to correctly talk about interface use.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
unit OverbyteIcsSrv5;
{$J+}
interface
uses
SysUtils, Windows, Messages, Classes, Graphics,
Controls, Forms, Dialogs, OverbyteIcsWSocket, Winsock, StdCtrls,
OverbyteIcsWndControl;
type
TServerForm = class(TForm)
SrvSocket: TWSocket;
InfoLabel: TLabel;
CliSocket: TWSocket;
DisconnectButton: TButton;
procedure SrvSocketSessionAvailable(Sender: TObject; Error: Word);
procedure FormShow(Sender: TObject);
procedure DisconnectButtonClick(Sender: TObject);
procedure CliSocketSessionClosed(Sender: TObject; Error: Word);
procedure FormCreate(Sender: TObject);
procedure SrvSocketBgException(Sender: TObject; E: Exception;
var CanClose: Boolean);
end;
var
ServerForm: TServerForm;
implementation
{$R *.DFM}
{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
procedure TServerForm.FormShow(Sender: TObject);
const
FirstTime : Boolean = TRUE;
begin
if FirstTime then begin
FirstTime := FALSE; { Do it only once ! }
SrvSocket.Addr := '0.0.0.0'; { Use any interface }
SrvSocket.Listen; { Start listening for client }
InfoLabel.Caption := 'Waiting for client';
end;
end;
{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
{* This event handler is called once a client has connected the server. *}
procedure TServerForm.SrvSocketSessionAvailable(Sender: TObject; Error: Word);
var
NewHSocket : TSocket;
PeerName : TSockAddrIn;
Peer : String;
begin
{ We need to accept the client connection }
NewHSocket := SrvSocket.Accept;
{ And then associate this connection with our client socket }
CliSocket.Dup(NewHSocket);
{ Wants to know who is connected to display on screen }
CliSocket.GetPeerName(PeerName, Sizeof(PeerName));
{ User likes to see internet address in dot notation }
Peer := IntToStr(ord(PeerName.sin_addr.S_un_b.s_b1)) + '.' +
IntToStr(ord(PeerName.sin_addr.S_un_b.s_b2)) + '.' +
IntToStr(ord(PeerName.sin_addr.S_un_b.s_b3)) + '.' +
IntToStr(ord(PeerName.sin_addr.S_un_b.s_b4));
InfoLabel.Caption := 'Remote ' + Peer + ' connected';
{ Send a welcome message to the client }
CliSocket.SendStr('Hello' + # + #);
{ Enable the server user to disconect the client }
DisconnectButton.Enabled := TRUE;
end;
{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
{* This event handler is called once the user clicks on Ddisconnect *}
procedure TServerForm.DisconnectButtonClick(Sender: TObject);
begin
CliSocket.ShutDown(); { Shut the communication down }
CliSocket.Close; { Close the communication }
end;
{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
{* This event handler is called once the client connection is broken. *}
{* Either by the client or the server. *}
procedure TServerForm.CliSocketSessionClosed(Sender: TObject; Error: Word);
begin
DisconnectButton.Enabled := FALSE;
InfoLabel.Caption := 'Waiting for client';{ Inform the user }
end;
{* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *}
procedure TServerForm.FormCreate(Sender: TObject);
begin
end;
procedure TServerForm.SrvSocketBgException(Sender: TObject; E: Exception;
var CanClose: Boolean);
begin
end;
end.
最近一直在学习关于网络 cs方面的东西，写个小博客作为笔记吧。