::: µ¨ÆÄÀÌ Tip&Trick :::

µ¨ÆÄÀÌ Tip&Trick ¼º°Ý¿¡ ¸ÂÁö ¾Ê´Â ±¤°í,ºñ¹æ,Áú¹®ÀÇ ±ÛÀº Áï½Ã »èÁ¦Çϸç
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  ±è¿µ´ë(2003-03-07 20:14:34, Hit : 6836, Vote : 1589
 ÆÄÀÏÀÌ ´Ù¸¥ ÇÁ·Î±×·¥¿¡ ÀÇÇØ »ç¿ëÁßÀÎÁö °Ë»ç

// ÆÄÀÏÀÌ ´Ù¸¥ ÇÁ·Î±×·¥ÀÇÇØ Á¡À¯µÇ¾î »ç¿ëÁßÀ̶ó¸é(Read/Write) ±× ÆÄÀÏÀº
// ¹èŸ(Exclusive)ÀûÀ¸·Î Àá°Ü(file lock) ÀÖÀ» °Ì´Ï´Ù
// ¾Æ·¡ ¼Ò½º¿¡¼­ ¹èŸÀûÀ¸·Î »ç¿ëÁßÀÎ ÆÄÀÏÀ» CreateFile() ÇÏ°Ô µÇ¸é
// ´ëºÎºÐ ½ÇÆÐÇÏ°Ô µÇ¾î »ç¿ëÁßÀÓÀ» °Ë»çÇÒ ¼ö ÀÖ½À´Ï´Ù
// ÇÏÁö¸¸ ÆÄÀÏÀ» Àо ³õ°í lock À» °ÉÁö ¾Ê´Â ÇÁ·Î±×·¥µµ ÀÖÀ¸¹Ç·Î
// ¾Æ·¡ ¼Ò½º°¡ ÀåÈ®È÷ µ¿ÀÛÇϴ°ÍÀº ¾Æ´Õ´Ï´Ù

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
{$R *.DFM}

function IsFileInUse(fName: String): boolean;
var
  HFileRes: HFILE;
begin
  Result := False;
  if not FileExists(fName) then
    System.Exit;
  HFileRes := CreateFile(pchar(fName), GENERIC_READ or GENERIC_WRITE,
              0 {this is the trick!}, nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
  Result := (HFileRes = INVALID_HANDLE_VALUE);
  if not Result then
    CloseHandle(HFileRes);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if not OpenDialog1.Execute then
    System.Exit;

  if IsFileInUse(OpenDialog1.FileName) then
    ShowMessage('ÆÄÀÏÀÌ ´Ù¸¥ ÇÁ·Î±×·¥¿¡ ÀÇÇØ »ç¿ëÁßÀÔ´Ï´Ù')
  else
    ShowMessage('ÆÄÀÏÀ» »ç¿ë(read/write)Çϼŵµ µË´Ï´Ù');
end;

end.





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