include/wx/init.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/init.h
   3 // Purpose:     wxWidgets initialization and finalization functions
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     29.06.2003
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwidgets.org>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_INIT_H_
  13 #define _WX_INIT_H_
  14
  15 #include "wx/defs.h"
  16 #include "wx/chartype.h"
  17
  18 // ----------------------------------------------------------------------------
  19 // wxEntry helper functions which allow to have more fine grained control
  20 // ----------------------------------------------------------------------------
  21
  22 // do common initialization, return true if ok (in this case wxEntryCleanup
  23 // must be called later), otherwise the program can't use wxWidgets at all
  24 //
  25 // this function also creates wxTheApp as a side effect, if IMPLEMENT_APP
  26 // hadn't been used a dummy default application object is created
  27 //
  28 // note that the parameters may be modified, this is why we pass them by
  29 // reference!
  30 extern bool WXDLLIMPEXP_BASE wxEntryStart(int& argc, wxChar **argv);
  31
  32 // free the resources allocated by the library in wxEntryStart() and shut it
  33 // down (wxEntryStart() may be called again afterwards if necessary)
  34 extern void WXDLLIMPEXP_BASE wxEntryCleanup();
  35
  36
  37 // ----------------------------------------------------------------------------
  38 // wxEntry: this function initializes the library, runs the main event loop
  39 //          and cleans it up
  40 // ----------------------------------------------------------------------------
  41
  42 // note that other, platform-specific, overloads of wxEntry may exist as well
  43 // but this one always exists under all platforms
  44 //
  45 // returns the program exit code
  46 extern int WXDLLIMPEXP_BASE wxEntry(int& argc, wxChar **argv);
  47
  48 // we overload wxEntry[Start]() to take "char **" pointers too
  49 #if wxUSE_UNICODE
  50
  51 extern bool WXDLLIMPEXP_BASE wxEntryStart(int& argc, char **argv);
  52 extern int WXDLLIMPEXP_BASE wxEntry(int& argc, char **argv);
  53
  54 #endif// wxUSE_UNICODE
  55
  56 // Under Windows we define additional wxEntry() overloads with signature
  57 // compatible with WinMain() and not the traditional main().
  58 #if wxUSE_GUI && defined(__WINDOWS__)
  59     #include "wx/msw/init.h"
  60 #endif
  61
  62 // ----------------------------------------------------------------------------
  63 // Using the library without (explicit) application object: you may avoid using
  64 // wxDECLARE_APP and wxIMPLEMENT_APP macros and call the functions below instead at
  65 // the program startup and termination
  66 // ----------------------------------------------------------------------------
  67
  68 // initialize the library (may be called as many times as needed, but each
  69 // call to wxInitialize() must be matched by wxUninitialize())
  70 extern bool WXDLLIMPEXP_BASE wxInitialize();
  71 extern bool WXDLLIMPEXP_BASE wxInitialize(int argc, wxChar **argv);
  72 #if wxUSE_UNICODE
  73 extern bool WXDLLIMPEXP_BASE wxInitialize(int argc, char **argv);
  74 #endif
  75
  76 // clean up -- the library can't be used any more after the last call to
  77 // wxUninitialize()
  78 extern void WXDLLIMPEXP_BASE wxUninitialize();
  79
  80 // create an object of this class on stack to initialize/cleanup the library
  81 // automatically
  82 class WXDLLIMPEXP_BASE wxInitializer
  83 {
  84 public:
  85     // initialize the library
  86     wxInitializer()
  87     {
  88         m_ok = wxInitialize();
  89     }
  90
  91     wxInitializer(int argc, wxChar **argv)
  92     {
  93         m_ok = wxInitialize(argc, argv);
  94     }
  95
  96 #if wxUSE_UNICODE
  97     wxInitializer(int argc, char **argv)
  98     {
  99         m_ok = wxInitialize(argc, argv);
 100     }
 101 #endif // wxUSE_UNICODE
 102
 103     // has the initialization been successful? (explicit test)
 104     bool IsOk() const { return m_ok; }
 105
 106     // has the initialization been successful? (implicit test)
 107     operator bool() const { return m_ok; }
 108
 109     // dtor only does clean up if we initialized the library properly
 110     ~wxInitializer() { if ( m_ok ) wxUninitialize(); }
 111
 112 private:
 113     bool m_ok;
 114 };
 115
 116 #endif // _WX_INIT_H_
 117