How classes are exported in MFC DLL?

Exporting a class from MFC DLL is done by macro AFX_EXT_CLASS.
Syntax is like class AFX_EXT_CLASS <Class Name>;
Example:

class AFX_EXT_CLASS CMyAboutBox: public CDialog
{
  public : void ShowDialog(void);
};

Macro AFX_EXT_CLASS define as __declspec(dllexport) for DLL projects and __declspec(dllimport) in Application projects.

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