int xdf_get_event(struct xdf* xdf, unsigned int index,
int* evttype, double* onset, double* dur);
xdf_get_event() returns the information of the index-th event of the file referenced by the handle xdf. The event type, start (in seconds) and duration (in seconds) of the event are returned respectively to the pointers evttype, onset and dur.
xdf_get_event() returns 0 in case of success. Otherwise -1 is returned and errno is set appropriately.
xdf, evttype, onset or dur is NULL.
index is bigger than the number event in the file.