home *** CD-ROM | disk | FTP | other *** search
- unit ParentMainFormUnit;
-
- {$define Mutex}
-
- interface
-
- uses
- Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
- ExtCtrls, StdCtrls, IPCThrd;
-
- type
- TForm1 = class(TForm)
- Memo1: TMemo;
- Timer1: TTimer;
- procedure FormCreate(Sender: TObject);
- procedure FormDestroy(Sender: TObject);
- procedure Timer1Timer(Sender: TObject);
- private
- { Private declarations }
- public
- MemMapFile: TSharedMem;
- {$ifdef Mutex}
- Mutex: TMutex;
- {$endif}
- end;
-
- EWin32Error = class(Exception);
-
- var
- Form1: TForm1;
-
- const
- MemMapFileName = 'SampleMemoryMappedFile';
- MemMapSize = 1000;
-
- implementation
-
- {$R *.DFM}
-
- function LaunchChildApp: THandle;
- const
- ChildApp = 'ChildMemoryMappedFile.Exe';
- var
- SI: TStartupInfo;
- PI: TProcessInformation;
- begin
- GetStartupInfo(SI);
- if not CreateProcess(nil, ChildApp, nil, nil, False,
- 0, nil, nil, SI, PI) then
- raise EWin32Error.Create('Unable to launch ' + ChildApp);
- Result := PI.HProcess
- end;
-
- procedure TForm1.FormCreate(Sender: TObject);
- begin
- {$ifdef Mutex}
- Mutex := TMutex.Create('FileMappingMutex');
- {$endif}
- MemMapFile := TSharedMem.Create(MemMapFileName, MemMapSize);
- LaunchChildApp;
- end;
-
- procedure TForm1.FormDestroy(Sender: TObject);
- begin
- MemMapFile.Free
- end;
-
- procedure TForm1.Timer1Timer(Sender: TObject);
- begin
- if PChar(MemMapFile.Buffer)[0] <> #0 then
- begin
- {$ifdef Mutex}
- Mutex.Get(Integer(Infinite));
- {$endif}
- Memo1.Text := StrPas(PChar(MemMapFile.Buffer));
- {$ifdef Mutex}
- Mutex.Release
- {$endif}
- end
- end;
-
- end.
-