DOKK / manpages / debian 10 / libsdl1.2-dev / SDL_UserEvent.3.en
SDL_UserEvent(3) SDL API Reference SDL_UserEvent(3)

SDL_UserEvent - A user-defined event type

typedef struct{

Uint8 type;
int code;
void *data1;
void *data2; } SDL_UserEvent;

SDL_USEREVENT through to SDL_NUMEVENTS-1
User defined event code
User defined data pointer
User defined data pointer

SDL_UserEvent is in the user member of the structure SDL_Event. This event is unique, it is never created by SDL but only by the user. The event can be pushed onto the event queue using SDL_PushEvent. The contents of the structure members or completely up to the programmer, the only requirement is that type is a value from SDL_USEREVENT to SDL_NUMEVENTS-1 (inclusive).

SDL_Event event;
event.type = SDL_USEREVENT;
event.user.code = my_event_code;
event.user.data1 = significant_data;
event.user.data2 = 0;
SDL_PushEvent(&event);

SDL_Event, SDL_PushEvent

Tue 11 Sep 2001, 23:00 SDL