ACTIVATE_EVENT_HANDLER 490 modules/videoio/src/cap_msmf.hpp #define ACTIVATE_EVENT_HANDLER(objtype, ...) ref new objtype(__VA_ARGS__) ACTIVATE_EVENT_HANDLER 573 modules/videoio/src/cap_msmf.hpp #define ACTIVATE_EVENT_HANDLER(objtype, ...) Microsoft::WRL::Callback<objtype>(__VA_ARGS__).Get()