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最新推荐文章于 2025-08-21 09:06:15 发布

原创最新推荐文章于 2025-08-21 09:06:15 发布 · 784 阅读

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文章标签：

#application #function #class #include #module #access

本文介绍了wxWidgets中用于创建应用程序类的宏DECLARE_APP和IMPLEMENT_APP的使用方法。通过这两个宏可以实现wxGetApp函数，该函数允许从任何地方获取到当前应用程序对象，而不仅仅是wxApp的指针。

wxAppDerivedClass& wxGetApp()

This function doesn't exist in wxWidgets but it is created by using the IMPLEMENT_APP macro. Thus, before using it anywhere but in
the same module where this macro is used, you must make it available using DECLARE_APP.

The advantage of using this function compared to directly using the global wxTheApp pointer is that the latter is of type wxApp *
and so wouldn't allow you to access the functions specific to your application class but not present in wxApp while wxGetApp() returns
the object of the right type.

DECLARE_APP(className)

This is used in headers to create a forward declaration of the wxGetApp function implemented by IMPLEMENT_APP. It creates the declaration
className& wxGetApp(void).

Example:

DECLARE_APP(MyApp)

Include files
<wx/app.h>

IMPLEMENT_APP(className)

This is used in the application class implementation file to make the application class known to wxWidgets for dynamic construction.
You use this instead of

Example:

IMPLEMENT_APP(MyApp)