examples/Delphi/exmmfcu.pas

(* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is TurboPower SysTools
 *
 * The Initial Developer of the Original Code is
 * TurboPower Software
 *
 * Portions created by the Initial Developer are Copyright (C) 1996-2002
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * ***** END LICENSE BLOCK ***** *)

unit exmmfcu;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls,

  StStrms;

type
  TfrmMain = class(TForm)
    Edit1: TEdit;
    btnOpenMMF: TButton;
    btnCloseMMF: TButton;
    Timer1: TTimer;
    Label1: TLabel;
    procedure btnOpenMMFClick(Sender: TObject);
    procedure btnCloseMMFClick(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    { Private declarations }
  public
    { Public declarations }

    AMMFile  : TStMemoryMappedFile;
    Buf      : array[0..100] of char;
  end;

var
  frmMain: TfrmMain;

implementation

{$R *.DFM}


procedure TfrmMain.btnOpenMMFClick(Sender: TObject);
begin
  AMMFile := TStMemoryMappedFile.Create('', 100, False, True);
  if (Assigned(AMMFile)) then begin
    btnOpenMMF.Enabled := False;
    btnCloseMMF.Enabled := True;
    Timer1.Enabled := True;
    Label1.Caption := 'Waiting: ';
  end else
    ShowMessage('Unable to open file');
end;

procedure TfrmMain.btnCloseMMFClick(Sender: TObject);
begin
  AMMFile.Free;
  AMMFile := nil;
  btnOpenMMF.Enabled := True;
  btnCloseMMF.Enabled := False;
  Timer1.Enabled := False;
end;

procedure TfrmMain.Timer1Timer(Sender: TObject);
begin
  Label1.Caption := 'Seeking: ' + IntToStr(AMMFile.DataSize);
  Timer1.Enabled := False;
  AMMFile.Seek(0, soFromBeginning);
  AMMFile.Read(Buf, AMMFile.DataSize);
  Edit1.Text := StrPas(Buf);
  Timer1.Enabled := True;
end;

procedure TfrmMain.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  AMMFile.Free;
  AMMFile := nil;
end;

end.
1	(* *** BEGIN LICENSE BLOCK ***
2	* Version: MPL 1.1
3	*
4	* The contents of this file are subject to the Mozilla Public License Version
5	* 1.1 (the "License"); you may not use this file except in compliance with
6	* the License. You may obtain a copy of the License at
7	* http://www.mozilla.org/MPL/
8	*
9	* Software distributed under the License is distributed on an "AS IS" basis,
10	* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
11	* for the specific language governing rights and limitations under the
12	* License.
13	*
14	* The Original Code is TurboPower SysTools
15	*
16	* The Initial Developer of the Original Code is
17	* TurboPower Software
18	*
19	* Portions created by the Initial Developer are Copyright (C) 1996-2002
20	* the Initial Developer. All Rights Reserved.
21	*
22	* Contributor(s):
23	*
24	* *** END LICENSE BLOCK *** *)
25
26	unit exmmfcu;
27
28	interface
29
30	uses
31	Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
32	StdCtrls, ExtCtrls,
33
34	StStrms;
35
36	type
37	TfrmMain = class(TForm)
38	Edit1: TEdit;
39	btnOpenMMF: TButton;
40	btnCloseMMF: TButton;
41	Timer1: TTimer;
42	Label1: TLabel;
43	procedure btnOpenMMFClick(Sender: TObject);
44	procedure btnCloseMMFClick(Sender: TObject);
45	procedure Timer1Timer(Sender: TObject);
46	procedure FormClose(Sender: TObject; var Action: TCloseAction);
47	private
48	{ Private declarations }
49	public
50	{ Public declarations }
51
52	AMMFile : TStMemoryMappedFile;
53	Buf : array[0..100] of char;
54	end;
55
56	var
57	frmMain: TfrmMain;
58
59	implementation
60
61	{$R *.DFM}
62
63
64	procedure TfrmMain.btnOpenMMFClick(Sender: TObject);
65	begin
66	AMMFile := TStMemoryMappedFile.Create('', 100, False, True);
67	if (Assigned(AMMFile)) then begin
68	btnOpenMMF.Enabled := False;
69	btnCloseMMF.Enabled := True;
70	Timer1.Enabled := True;
71	Label1.Caption := 'Waiting: ';
72	end else
73	ShowMessage('Unable to open file');
74	end;
75
76	procedure TfrmMain.btnCloseMMFClick(Sender: TObject);
77	begin
78	AMMFile.Free;
79	AMMFile := nil;
80	btnOpenMMF.Enabled := True;
81	btnCloseMMF.Enabled := False;
82	Timer1.Enabled := False;
83	end;
84
85	procedure TfrmMain.Timer1Timer(Sender: TObject);
86	begin
87	Label1.Caption := 'Seeking: ' + IntToStr(AMMFile.DataSize);
88	Timer1.Enabled := False;
89	AMMFile.Seek(0, soFromBeginning);
90	AMMFile.Read(Buf, AMMFile.DataSize);
91	Edit1.Text := StrPas(Buf);
92	Timer1.Enabled := True;
93	end;
94
95	procedure TfrmMain.FormClose(Sender: TObject; var Action: TCloseAction);
96	begin
97	AMMFile.Free;
98	AMMFile := nil;
99	end;
100
101	end.