XPLMCheckMenuItemState

XPLMCheckMenuItemState

XPLM_API void                 XPLMCheckMenuItemState(
                                   XPLMMenuID           inMenu,    
                                   int                  index,    
                                   XPLMMenuCheck *      outCheck);    

This routine returns whether a menu item is checked or not. A menu item's check mark may be on or off, or a menu may not have an icon at all.