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(* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is TurboPower SysTools
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*
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* The Initial Developer of the Original Code is
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* TurboPower Software
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*
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* Portions created by the Initial Developer are Copyright (C) 1996-2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* ***** END LICENSE BLOCK ***** *)
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unit ExDQueU;
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interface
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uses
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Windows, Messages, SysUtils, Classes, Graphics, Controls,
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Forms, Dialogs, StdCtrls, Buttons, ExtCtrls,
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StConst, StBase, StUtils, StList, StDQue;
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type
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S10 = string[10];
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TSTDlg = class(TForm)
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CreateBtn: TButton;
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Edit1: TEdit;
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PushHeadBtn: TButton;
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PopHeadBtn: TButton;
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HeadBtn: TButton;
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TailBtn: TButton;
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LB1: TListBox;
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LoadBtn: TButton;
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SaveBtn: TButton;
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OD1: TOpenDialog;
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SD1: TSaveDialog;
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ClearBtn: TButton;
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PushTailBtn: TButton;
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PopTailBtn: TButton;
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procedure FormCreate(Sender: TObject);
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procedure FormClose(Sender: TObject; var Action: TCloseAction);
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procedure CreateBtnClick(Sender: TObject);
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procedure PushHeadBtnClick(Sender: TObject);
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procedure PopHeadBtnClick(Sender: TObject);
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procedure HeadBtnClick(Sender: TObject);
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procedure TailBtnClick(Sender: TObject);
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procedure LoadBtnClick(Sender: TObject);
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procedure SaveBtnClick(Sender: TObject);
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procedure ClearBtnClick(Sender: TObject);
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procedure PushTailBtnClick(Sender: TObject);
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procedure PopTailBtnClick(Sender: TObject);
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private
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{ Private declarations }
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public
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{ Public declarations }
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MyDQue : TStDQue;
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procedure FillListBox;
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procedure UpdateButtons(QueOK : Boolean);
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end;
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const
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MaxElem = 100;
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var
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STDlg: TSTDlg;
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implementation
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{$R *.DFM}
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procedure MyDelNodeData(Data : pointer); far;
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{-procedure to delete data pointer in each node
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during call to TSTList.Destroy}
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begin
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FreeMem(Data, SizeOf(S10));
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end;
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function MyLoadData(Reader : TReader) : Pointer; far;
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begin
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GetMem(Result, SizeOf(S10));
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S10(Result^) := Reader.ReadString;
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end;
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procedure MyStoreData(Writer : TWriter; Data : Pointer); far;
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begin
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Writer.WriteString(S10(Data^));
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end;
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procedure TSTDlg.FormCreate(Sender: TObject);
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begin
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RegisterClasses([TStDQue,TStListNode]);
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UpdateButtons(False);
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end;
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procedure TSTDlg.FormClose(Sender: TObject;
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var Action: TCloseAction);
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begin
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MyDQue.Free;
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end;
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procedure TSTDlg.FillListBox;
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var
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PN : TStListNode;
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begin
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LB1.Clear;
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LB1.Perform(WM_SETREDRAW, 0, 0);
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PN := MyDQue.Head;
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while (PN <> nil) do
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begin
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LB1.Items.Add(S10(PN.Data^));
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PN := MyDQue.Next(PN);
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end;
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LB1.Perform(WM_SETREDRAW, 1, 0);
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LB1.Update;
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end;
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procedure TSTDlg.UpdateButtons(QueOK : Boolean);
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begin
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ClearBtn.Enabled := QueOK;
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PushHeadBtn.Enabled := QueOK;
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PopHeadBtn.Enabled := QueOK;
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PushTailBtn.Enabled := QueOK;
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PopTailBtn.Enabled := QueOK;
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HeadBtn.Enabled := QueOK;
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TailBtn.Enabled := QueOK;
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SaveBtn.Enabled := QueOK;
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end;
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procedure TSTDlg.CreateBtnClick(Sender: TObject);
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var
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I : Integer;
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S : ^S10;
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begin
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if Assigned(MyDQue) then
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MyDQue.Free;
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UpdateButtons(False);
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MyDQue := TStDQue.Create(TStListNode);
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MyDQue.DisposeData := MyDelNodeData;
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MyDQue.LoadData := MyLoadData;
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MyDQue.StoreData := MyStoreData;
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for I := 1 to MaxElem do
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begin
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GetMem(S, SizeOf(S10));
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S^ := 'Item' + IntToStr(I);
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MyDQue.Append(S);
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end;
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FillListBox;
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UpdateButtons(True);
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end;
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procedure TSTDlg.ClearBtnClick(Sender: TObject);
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begin
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MyDQue.Clear;
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Edit1.Text := '';
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FillListBox;
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UpdateButtons(False);
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end;
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procedure TSTDlg.PushHeadBtnClick(Sender: TObject);
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var
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NewString : ^S10;
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begin
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if (Edit1.Text = '') then
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begin
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ShowMessage('No value entered');
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Exit;
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end;
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GetMem(NewString,SizeOf(S10));
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NewString^ := Edit1.Text;
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MyDQue.PushHead(NewString);
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FillListBox;
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end;
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procedure TSTDlg.PopHeadBtnClick(Sender: TObject);
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begin
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MyDQue.PopHead;
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FillListBox;
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end;
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procedure TSTDlg.PushTailBtnClick(Sender: TObject);
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var
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NewString : ^S10;
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begin
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if (Edit1.Text = '') then
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begin
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ShowMessage('No value entered');
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Exit;
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end;
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GetMem(NewString,SizeOf(S10));
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NewString^ := Edit1.Text;
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MyDQue.PushTail(NewString);
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FillListBox;
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end;
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procedure TSTDlg.PopTailBtnClick(Sender: TObject);
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begin
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MyDQue.PopTail;
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FillListBox;
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end;
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procedure TSTDlg.HeadBtnClick(Sender: TObject);
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var
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Data : Pointer;
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begin
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MyDQue.PeekHead(Data);
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Edit1.Text := S10(Data^);
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end;
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procedure TSTDlg.TailBtnClick(Sender: TObject);
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var
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Data : Pointer;
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begin
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MyDQue.PeekTail(Data);
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Edit1.Text := S10(Data^);
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end;
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procedure TSTDlg.LoadBtnClick(Sender: TObject);
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begin
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if (OD1.Execute) then
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begin
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if (NOT Assigned(MyDQue)) then
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begin
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UpdateButtons(False);
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MyDQue := TStDQue.Create(TStListNode);
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MyDQue.DisposeData := MyDelNodeData;
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MyDQue.LoadData := MyLoadData;
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MyDQue.StoreData := MyStoreData;
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end;
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MyDQue.LoadFromFile(OD1.FileName);
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FillListBox;
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UpdateButtons(True);
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end;
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end;
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procedure TSTDlg.SaveBtnClick(Sender: TObject);
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begin
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if (SD1.Execute) then
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MyDQue.StoreToFile(SD1.FileName);
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end;
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end.
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