dxechoservercore.pas

Well known and usefull component for delphi 7

unit DXEchoServerCore;

interface

///////////////////////////////////////////////////////////////////////////////
//    Component: TDXEchoServerCore
//       Author: G.E. Ozz Nixon Jr. ([e-mail])
// ========================================================================
// Source Owner: DX, Inc. 1995-2003
//    Copyright: All code is the property of DX, Inc. Licensed for
//               resell by Brain Patchwork DX (tm) and part of the
//               DX (r) product lines, which are (c) 1999-2003
//               DX, Inc. Source may not be distributed without
//               written permission from both Brain Patchwork DX,
//               and DX, Inc.
//      License: (Reminder), None of this code can be added to other
//               developer products without permission. This includes
//               but not limited to DCU's, DCP's, DLL's, OCX's, or
//               any other form of merging our technologies. All of
//               your products released to a public consumer be it
//               shareware, freeware, commercial, etc. must contain a
//               license notification somewhere visible in the
//               application.
//               Example is Internet Explorer - Help->About screen
//               shows the licensed code contained in the application.
// Code Version: (4th Generation Code)
// ========================================================================
//  Description: Implements ECHO protocol
// ========================================================================
///////////////////////////////////////////////////////////////////////////////

uses
  Classes,
  DXServerCore;

{$I DXSock.def}

type
  TDXEchoServerCore = class(TDXServerCore)
  private
    fbCloseOnTimeout:Boolean;
  protected
  public
    constructor Create(AOwner:TComponent); {$IFNDEF OBJECTS_ONLY} override; {$ENDIF}
    destructor Destroy; override;
    procedure ProcessSession(ClientThread:TDXClientThread);
  published
    property CloseOnTimeout:Boolean read fbCloseOnTimeout
                                    write fbCloseOnTimeout;
  end;

implementation

Uses
   DXSock,
   DXString;


constructor TDXEchoServerCore.Create(AOwner:TComponent);
begin
   inherited Create(AOwner);
   ServerPort:=7;
   Timeout:=30000;
   fbCloseOnTimeout:=True;
end;

destructor TDXEchoServerCore.Destroy;
begin
  inherited Destroy;
end;

procedure TDXEchoServerCore.ProcessSession(ClientThread: TDXClientThread);
Var
   S:String;
   startTime:Comp;
   OutData:Pointer;
   Loop:Integer;
   WasHandled:Boolean;

begin
   fbForceAbort:=False;
   with ClientThread.Socket do begin
      while Connected do begin
         If fbForceAbort then Exit;
         StartTime:=TimeCounter;
         S:=#0;
         While (TimeCounter<startTime+TimeOut) and (S=#0) do Begin
            If (ReadAble) then Begin
               If (CharactersToRead=0) then Exit
               Else Begin
                  S:=ReadStr(-1);
                  If LastReadTimeout then S:=#0;
                  If (S<>'') and (Not LastReadTimeout) then Begin
               if assigned({$IFDEF TLS_EDITION}OnReadFilter{$ELSE}OnFilter{$ENDIF}) then begin
                        Loop:=FilterRead(@S[1],OutData,Length(S),ClientThread);
                        SetLength(S,Loop);
                        If Assigned(OutData) then Begin
                           FastMove(TDXBSArray(OutData^),S[1],Loop);
{$IFDEF TLS_EDITION}OnReadFilter{$ELSE}OnFilter{$ENDIF}(ddFreePointer,nil,OutData,Loop,Loop,WasHandled,ClientThread) ;
                        End;
                     End;
                  End;
               End;
            End
            Else DoSleepEx(1);
         End;
         If (TimeCounter>startTime+TimeOut) then
            If fbCloseOnTimeout then Exit;
         If ValidSocket and (not LastReadTimeout) then Write(S);
      end;
   end;
end;

end.