wxWidgets/include/wx/init.h

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///////////////////////////////////////////////////////////////////////////////
// Name: wx/init.h
// Purpose: wxWindows initialization and finalization functions
// Author: Vadim Zeitlin
// Modified by:
// Created: 29.06.2003
// RCS-ID: $Id$
// Copyright: (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_INIT_H_
#define _WX_INIT_H_
#include "wx/wxchar.h"
// ----------------------------------------------------------------------------
// wxEntry helper functions which allow to have more fine grained control
// ----------------------------------------------------------------------------
// do common initialization, return true if ok (in this case wxEntryCleanup
// must be called later), otherwise the program can't use wxWindows at all
//
// this function also creates wxTheApp as a side effect, if IMPLEMENT_APP
// hadn't been used a dummy default application object is created
//
// note that the parameters may be modified
extern bool WXDLLEXPORT wxEntryStart(int argc, wxChar **argv);
// free the resources allocated by the library in wxEntryStart() and shut it
// down (wxEntryStart() may be called again afterwards if necessary)
extern void WXDLLEXPORT wxEntryCleanup();
// ----------------------------------------------------------------------------
// wxEntry: this function initializes the library, runs the main event loop
// and cleans it up
// ----------------------------------------------------------------------------
// note that other, platform-specific, overloads of wxEntry may exist as well
// but this one always exists under all platforms
//
// returns the program exit code
extern int WXDLLEXPORT wxEntry(int argc, wxChar **argv);
// ----------------------------------------------------------------------------
// Using the library without (explicit) application object: you may avoid using
// DECLARE_APP and IMPLEMENT_APP macros and call the functions below instead at
// the program startup and termination
// ----------------------------------------------------------------------------
// initialize the library (may be called as many times as needed, but each
// call to wxInitialize() must be matched by wxUninitialize())
extern bool WXDLLEXPORT wxInitialize(int argc = 0, wxChar **argv = NULL);
// clean up -- the library can't be used any more after the last call to
// wxUninitialize()
extern void WXDLLEXPORT wxUninitialize();
// create an object of this class on stack to initialize/cleanup the library
// automatically
class WXDLLEXPORT wxInitializer
{
public:
// initialize the library
wxInitializer() { m_ok = wxInitialize(); }
// has the initialization been successful? (explicit test)
bool IsOk() const { return m_ok; }
// has the initialization been successful? (implicit test)
operator bool() const { return m_ok; }
// dtor only does clean up if we initialized the library properly
~wxInitializer() { if ( m_ok ) wxUninitialize(); }
private:
bool m_ok;
};
#endif // _WX_INIT_H_