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Posted on 1998-07-21
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Last Modified: 2013-11-20
I use Visual C++5
 I would like to make my window 's application same modal dialog. when i execeute my application
the other application cann't use till i quit my application.
Please advise me to do it.
thank you
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Question by:eakkung
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5 Comments
 

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by:eakkung
ID: 1319480
Edited text of question
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atari earned 360 total points
ID: 1319481
Hi, I call your application-class CApplic : CWinApp. Add the following variable to your Applic.h-File:

HANDLE m_hInstanceSem;

Then add the following function to your Applic.cpp-file, there where you find the functions InitInstance() and ExitInstance().

BOOL CApplic::IsFirstInstance()
{
  // Define a global semaphore to see if we are already running an instance
  m_hInstanceSem=CreateSemaphore(NULL,0,1,_T("INSTANCE_CHECK__1"));
  if (!m_hInstanceSem)
      return FALSE;

  if (m_hInstanceSem!=NULL && GetLastError()==ERROR_ALREADY_EXISTS)
  {
    CloseHandle(m_hInstanceSem);
    m_hInstanceSem=NULL;
    return FALSE;
  }
 
  return TRUE;
}

Then in the beginning your InitInstance()-function add the following:
BOOL CApplic::InitInstance()
{
  if (!IsFirstInstance())
  {
     AfxMessageBox("Application is already running ...");
     return FALSE;
  }
 
.   and so on.

Then if you run your program first, the program starts correctly. But if you run your program a second time, the above message appears and the program never starts.

Hope this helps.

Bye,
atari
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Expert Comment

by:trestan
ID: 1319482
Actually I do not understand the question thoroughly. Did he want to make the application can be run only once?
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Expert Comment

by:atari
ID: 1319483
To trestan, it sounds for me like this, or wasn't this the question ?
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LVL 1

Expert Comment

by:atari
ID: 1319484
Can we get any answer from you, eakkung ???

Bye,
atari
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