examples/CBuilder/exmmfsu.cpp

// ***** 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 *****
//---------------------------------------------------------------------------
#include <vcl\vcl.h>
#pragma hdrstop

#include "exmmfsu.h"
#pragma link "ststrms"
//---------------------------------------------------------------------------
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::btnOpenMMFClick(TObject *Sender)
{

  try {
    AMMFile = new TStMemoryMappedFile("", 100, false, true);
    btnOpenMMF->Enabled  = false;
    btnCloseMMF->Enabled = true;
    btnUpdate->Enabled   = true;
  }
  catch (...) {
    ShowMessage("Unable to create file");
  }

}
//---------------------------------------------------------------------------
void __fastcall TForm1::btnCloseMMFClick(TObject *Sender)
{
  delete AMMFile;
  AMMFile = NULL;
  btnOpenMMF->Enabled  = true;
  btnCloseMMF->Enabled = false;
  btnUpdate->Enabled   = false;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::btnUpdateClick(TObject *Sender)
{
  AnsiString S = Edit1->Text;
  AMMFile->Seek(0, soFromBeginning);
  StrPCopy(Buf, S);
  AMMFile->Write(Buf, S.Length()+1);
  Label1->Caption = "Data Size: " + IntToStr(AMMFile->DataSize);
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)
{
  delete AMMFile;
  AMMFile = NULL;
}
//---------------------------------------------------------------------------
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	#include <vcl\vcl.h>
27	#pragma hdrstop
28
29	#include "exmmfsu.h"
30	#pragma link "ststrms"
31	//---------------------------------------------------------------------------
32	#pragma resource "*.dfm"
33	TForm1 *Form1;
34	//---------------------------------------------------------------------------
35	__fastcall TForm1::TForm1(TComponent* Owner)
36	: TForm(Owner)
37	{
38	}
39	//---------------------------------------------------------------------------
40	void __fastcall TForm1::btnOpenMMFClick(TObject *Sender)
41	{
42
43	try {
44	AMMFile = new TStMemoryMappedFile("", 100, false, true);
45	btnOpenMMF->Enabled = false;
46	btnCloseMMF->Enabled = true;
47	btnUpdate->Enabled = true;
48	}
49	catch (...) {
50	ShowMessage("Unable to create file");
51	}
52
53	}
54	//---------------------------------------------------------------------------
55	void __fastcall TForm1::btnCloseMMFClick(TObject *Sender)
56	{
57	delete AMMFile;
58	AMMFile = NULL;
59	btnOpenMMF->Enabled = true;
60	btnCloseMMF->Enabled = false;
61	btnUpdate->Enabled = false;
62	}
63	//---------------------------------------------------------------------------
64	void __fastcall TForm1::btnUpdateClick(TObject *Sender)
65	{
66	AnsiString S = Edit1->Text;
67	AMMFile->Seek(0, soFromBeginning);
68	StrPCopy(Buf, S);
69	AMMFile->Write(Buf, S.Length()+1);
70	Label1->Caption = "Data Size: " + IntToStr(AMMFile->DataSize);
71	}
72	//---------------------------------------------------------------------------
73	void __fastcall TForm1::FormClose(TObject *Sender, TCloseAction &Action)
74	{
75	delete AMMFile;
76	AMMFile = NULL;
77	}
78	//---------------------------------------------------------------------------