prevent multi dllinjection in created process

hi!

I have a  CreateProcessex(nil,'C:\mygame\mygame.exe',nil, nil, false, 0, nil,nil, si, pi,  'Multiplayer.dll');
i want to prevent that this doesnt happen two times.
how?
Zabuza-sanAsked:
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Wim ten BrinkSelf-employed developerCommented:
Put a mutex in mygame.exe which will be triggered the second time it gets called. With the second call, the game will see that it has been started already thus it can be terminated.

If you want to prevent calling the executable twice from the calling process, check if it's already running by retrieving a list of all active processes.
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Zabuza-sanAuthor Commented:
how to put the mutex in mygame.exe?
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Wim ten BrinkSelf-employed developerCommented:
Well, do you have the sourcecode for mygame.exe?

If so, check out http://www.ibrtses.com/delphi/singleinstance.html for a simple example...
Excerpt of example:

program MyApp;
uses
  Windows,Forms,
  MyApp1 in 'MyApp1.pas' {Form1};
var
  Mutex : THandle;
{$R *.RES}
begin
Mutex := CreateMutex(nil, True, 'MyAppName');
if (Mutex <> 0) and (GetLastError = 0) then
  begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
  if Mutex <> 0 then
    CloseHandle(Mutex);
  end;
end.

Or visit Google http://www.google.com/search?q=delphi+mutex for more links about this. ;-)
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