delphi ICS控件示例解读

 {* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

 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。