C / C++ / MFC

Code-o-mat wrote:

Are you completely sure that the only difference between the two "versions" is the creation of the mutex?

Code-o-mat wrote:

Is it possible that you specified the same name for the mutex and the file mapping object?

Code-o-mat wrote:

Try creating an unnamed mutex and see if that changes anything. I know you will need a named one but this is just for testing.

Maxwell Chen wrote:

if(hMutex) {

Luc Pattyn wrote:

shouldn't that be if(!hMutex) { ?

HANDLE hMutex = CreateMutex(NULL, FALSE, MUTEX_NAME);
if(hMutex) { // Returning a valid handle means that this mutex object has been successfully created.
    if(ERROR_ALREADY_EXISTS == GetLastError()) {
        // So we check the system error.
        // It says the mutex object has already been existing.
        // Meaning this is a second instance of the program.
        return FALSE;    // So we have this one exit.
    }
    // The other case is no error. :-)
}

BOOL CMyWnd::PreTranslateMessage(MSG* pMsg) 
{
	BOOL b = CDialog::PreTranslateMessage(pMsg);

	if(pMsg->message == WM_LBUTTONDOWN)
	{
                
		if(pMsg->hwnd == m_edit.GetSafeHwnd())
		    MessageBox("Edit control);
	}
	
	return b;
}

/*virtual*/ BOOL CYourParentWnd::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
  *pResult = 0;

  NMHDR* pHeader = (NMHDR*) lParam;
 
  switch (pHeader->code) {
    case NM_CLICK:
      {
        CWnd* pcChild = CWnd::FromHandle(pHeader->hwndFrom);
        //..
      }
      break;
     //..
  }

  return FALSE;
}

They sought it with thimbles, they sought it with care;
They pursued it with forks and hope;
They threatened its life with a railway-share;
They charmed it with smiles and soap.

Mr_Leon wrote:

I want to be a hacker