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///////////////////////////////////////////////////////////////////////////////
// Name: wx/snglinst.h
// Purpose: wxSingleInstanceChecker can be used to restrict the number of
// simultaneously running copies of a program to one
// Author: Vadim Zeitlin
// Modified by:
// Created: 08.06.01
// Copyright: (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_SNGLINST_H_
#define _WX_SNGLINST_H_
#if wxUSE_SNGLINST_CHECKER
#include "wx/app.h"
#include "wx/utils.h"
// ----------------------------------------------------------------------------
// wxSingleInstanceChecker
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_BASE wxSingleInstanceChecker
{
public:
// default ctor, use Create() after it
wxSingleInstanceChecker() { Init(); }
// like Create() but no error checking (dangerous!)
wxSingleInstanceChecker(const wxString& name,
const wxString& path = wxEmptyString)
{
Init();
Create(name, path);
}
// notice that calling Create() is optional now, if you don't do it before
// calling IsAnotherRunning(), CreateDefault() is used automatically
//
// name it is used as the mutex name under Win32 and the lock file name
// under Unix so it should be as unique as possible and must be non-empty
//
// path is optional and is ignored under Win32 and used as the directory to
// create the lock file in under Unix (default is wxGetHomeDir())
//
// returns false if initialization failed, it doesn't mean that another
// instance is running - use IsAnotherRunning() to check it
bool Create(const wxString& name, const wxString& path = wxEmptyString);
// use the default name, which is a combination of wxTheApp->GetAppName()
// and wxGetUserId() for mutex/lock file
//
// this is called implicitly by IsAnotherRunning() if the checker hadn't
// been created until then
bool CreateDefault()
{
wxCHECK_MSG( wxTheApp, false, "must have application instance" );
return Create(wxTheApp->GetAppName() + '-' + wxGetUserId());
}
// is another copy of this program already running?
bool IsAnotherRunning() const
{
if ( !m_impl )
{
if ( !const_cast<wxSingleInstanceChecker *>(this)->CreateDefault() )
{
// if creation failed, return false as it's better to not
// prevent this instance from starting up if there is an error
return false;
}
}
return DoIsAnotherRunning();
}
// dtor is not virtual, this class is not meant to be used polymorphically
~wxSingleInstanceChecker();
private:
// common part of all ctors
void Init() { m_impl = NULL; }
// do check if another instance is running, called only if m_impl != NULL
bool DoIsAnotherRunning() const;
// the implementation details (platform specific)
class WXDLLIMPEXP_FWD_BASE wxSingleInstanceCheckerImpl *m_impl;
wxDECLARE_NO_COPY_CLASS(wxSingleInstanceChecker);
};
#endif // wxUSE_SNGLINST_CHECKER
#endif // _WX_SNGLINST_H_
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