# SDL_AppEvent_func Function pointer typedef for [SDL_AppEvent](SDL_AppEvent). ## Header File Defined in [<SDL3/SDL_init.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_init.h) ## Syntax ```c typedef SDL_AppResult (SDLCALL *SDL_AppEvent_func)(void *appstate, SDL_Event *event); ``` ## Function Parameters | | | | ------------ | ----------------------------------------------------------------------- | | **appstate** | an optional pointer, provided by the app in [SDL_AppInit](SDL_AppInit). | | **event** | the new event for the app to examine. | ## Return Value Returns [SDL_APP_FAILURE](SDL_APP_FAILURE) to terminate with an error, [SDL_APP_SUCCESS](SDL_APP_SUCCESS) to terminate with success, [SDL_APP_CONTINUE](SDL_APP_CONTINUE) to continue. ## Remarks These are used by [SDL_EnterAppMainCallbacks](SDL_EnterAppMainCallbacks). This mechanism operates behind the scenes for apps using the optional main callbacks. Apps that want to use this should just implement [SDL_AppEvent](SDL_AppEvent) directly. ## Version This datatype is available since SDL 3.2.0. ---- [CategoryAPI](CategoryAPI), [CategoryAPIDatatype](CategoryAPIDatatype), [CategoryInit](CategoryInit)