Using wxModule

The module system is a very simple mechanism to allow applications (and parts of wxWidgets itself) to define initialization and cleanup functions that are automatically called on wxWidgets startup and exit. It can save an application from having to call a lot of initialization and cleanup code in its OnInit and OnExit functions, depending on the features that it uses.

To define a new kind of module, derive a class from wxModule, override the OnInit and OnExit functions, and add the DECLARE_DYNAMIC_CLASS and IMPLEMENT_DYNAMIC_CLASS to the class and implementation (which can be in the same file). On initialization, wxWidgets will find all classes derived from wxModule, create an instance of each, and call each OnInit function. On exit, wxWidgets will call the OnExit function for each module instance.

For example:

 // A module to allow DDE initialization/cleanup class wxDDEModule: public wxModule { DECLARE_DYNAMIC_CLASS(wxDDEModule) public:     wxDDEModule() {}     bool OnInit() { wxDDEInitialize(); return true; };     void OnExit() { wxDDECleanUp(); }; }; IMPLEMENT_DYNAMIC_CLASS(wxDDEModule, wxModule)