examples/Delphi/exmmfsu.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 exmmfsu;

interface

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

  StStrms;

type
  TfrmMain = class(TForm)
    Edit1: TEdit;
    btnUpdate: TButton;
    btnOpenMMF: TButton;
    btnCloseMMF: TButton;
    Label1: TLabel;
    procedure btnOpenMMFClick(Sender: TObject);
    procedure btnCloseMMFClick(Sender: TObject);
    procedure btnUpdateClick(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;
    btnUpdate.Enabled := True;
  end else
    ShowMessage('Unable to create file');
end;

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

procedure TfrmMain.btnUpdateClick(Sender: TObject);
begin
  AMMFile.Seek(0, soFromBeginning);
  StrPCopy(Buf, Edit1.Text);
  AMMFile.Write(Buf, Length(Edit1.Text)+1);
  Label1.Caption := 'Data Size: ' + IntToStr(AMMFile.DataSize);
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 exmmfsu;
27
28	interface
29
30	uses
31	Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
32	StdCtrls,
33
34	StStrms;
35
36	type
37	TfrmMain = class(TForm)
38	Edit1: TEdit;
39	btnUpdate: TButton;
40	btnOpenMMF: TButton;
41	btnCloseMMF: TButton;
42	Label1: TLabel;
43	procedure btnOpenMMFClick(Sender: TObject);
44	procedure btnCloseMMFClick(Sender: TObject);
45	procedure btnUpdateClick(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	btnUpdate.Enabled := True;
71	end else
72	ShowMessage('Unable to create file');
73	end;
74
75	procedure TfrmMain.btnCloseMMFClick(Sender: TObject);
76	begin
77	AMMFile.Free;
78	AMMFile := nil;
79	btnOpenMMF.Enabled := True;
80	btnCloseMMF.Enabled := False;
81	btnUpdate.Enabled := False;
82	end;
83
84	procedure TfrmMain.btnUpdateClick(Sender: TObject);
85	begin
86	AMMFile.Seek(0, soFromBeginning);
87	StrPCopy(Buf, Edit1.Text);
88	AMMFile.Write(Buf, Length(Edit1.Text)+1);
89	Label1.Caption := 'Data Size: ' + IntToStr(AMMFile.DataSize);
90	end;
91
92	procedure TfrmMain.FormClose(Sender: TObject; var Action: TCloseAction);
93	begin
94	AMMFile.Free;
95	AMMFile := nil;
96	end;
97
98	end.