Sound problems

no-reply@allegro.cc (YerbiDer) — Mon, 13 Feb 2012 23:33:48 +0000

Here I have a simple part of a code:

#SelectExpand
  1(...)
  2ALLEGRO_SAMPLE *song = NULL;
  3ALLEGRO_SAMPLE_ID* SWITCH;
  4(...)
  5song = al_load_sample("DATA/SOUND/GoGo.ogg");
  6  if(!song){
  7              fprintf(stderr, "failed to create sound 3!\n");
  8              }
  9(...)
 10al_play_sample(song, 0.8, 0, 1, ALLEGRO_PLAYMODE_LOOP, SWITCH);
 11(...)

On my laptop it works perfectly. The music plays and stops when it should, but on my PC the game crashes on al_play_sample(). When I delete the sample_id part(or turn off the music by the game menu) it works fine, but i can't stop the music ><".

no-reply@allegro.cc (Matthew Leverton) — Mon, 13 Feb 2012 23:35:50 +0000

ALLEGRO_SAMPLE_ID SWITCH;
al_play_sample(song, 0.8, 0, 1, ALLEGRO_PLAYMODE_LOOP, &SWITCH);

no-reply@allegro.cc (YerbiDer) — Mon, 13 Feb 2012 23:42:00 +0000

Thank you. And can you explain me shortly why it's this way?

no-reply@allegro.cc (Matthew Leverton) — Mon, 13 Feb 2012 23:50:58 +0000

Allegro assumes you have already reserved the space for the sample id, so you need to pass it a pointer that points to a valid block of memory.

ALLEGRO_SAMPLE_ID foo; // reserves space
ALLEGRO_SAMPLE_ID *fooptr; // points to some arbitrary location