Error in keyboard events in Allegro

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I’m doing a work of my course using Allegro as indicated.

I need to capture the events of loose keystrokes on the keyboard, so I used the following:

al_wait_for_event(evento, &ev);
if(ev.type == ALLEGRO_EVENT_KEY_UP){
   if (ev.keyboard.keycode==ALLEGRO_KEY_A || ev.keyboard.keycode==ALLEGRO_KEY_LEFT)
       cmd='a';
   else if (ev.keyboard.keycode==ALLEGRO_KEY_W || ev.keyboard.keycode==ALLEGRO_KEY_UP)
            cmd='w';
   else if (ev.keyboard.keycode==ALLEGRO_KEY_D || ev.keyboard.keycode==ALLEGRO_KEY_RIGHT)
            cmd='d';
   else if (ev.keyboard.keycode==ALLEGRO_KEY_S || ev.keyboard.keycode==ALLEGRO_KEY_DOWN)
            cmd='s';
}

But the event returns the key value 6 times instead of just one!

In the code I had still included (previously) these clauses:

al_install_keyboard();
[...]
al_register_event_source(evento, al_get_keyboard_event_source());

What am I missing?

c events keyboard

  • Did you find a solution? Poste as an answer to help other people.

  • Which operating system? You are authorized to use an alternative method?

2 answers

0

I used this in a little game I made, I had to type the name, then I concatenated the string with the typed key:

//FUNÇÃO PARA INSERIR NOMES
void LE_TECLADO() {
  int tam;

  readkey();
  if (strlen(nome) < 13){
    if(key[KEY_A])
      strcat(nome,"A");
    else if(key[KEY_B])
      strcat(nome,"B");
    else if(key[KEY_C])
      strcat(nome,"C");
    else if(key[KEY_D])
      strcat(nome,"D");
    else if(key[KEY_E])
      strcat(nome,"E");
    else if(key[KEY_F])
      strcat(nome,"F");
    else if(key[KEY_G])
      strcat(nome,"G");
    else if(key[KEY_H])
      strcat(nome,"H");
    else if(key[KEY_I])
      strcat(nome,"I");
    else if(key[KEY_J])
      strcat(nome,"J");
    else if(key[KEY_K])
      strcat(nome,"K");
    else if(key[KEY_L])
      strcat(nome,"L");
    else if(key[KEY_M])
      strcat(nome,"M");
    else if(key[KEY_N])
      strcat(nome,"N");
    else if(key[KEY_O])
      strcat(nome,"O");
    else if(key[KEY_P])
      strcat(nome,"P");
    else if(key[KEY_Q])
      strcat(nome,"Q");
    else if(key[KEY_R])
      strcat(nome,"R");
    else if(key[KEY_S])
      strcat(nome,"S");
    else if(key[KEY_T])
      strcat(nome,"T");
    else if(key[KEY_U])
      strcat(nome,"U");
    else if(key[KEY_V])
      strcat(nome,"V");
    else if(key[KEY_X])
      strcat(nome,"X");
    else if(key[KEY_Z])
      strcat(nome,"Z");
    else if(key[KEY_SPACE])
      strcat(nome," ");
    else if(key[KEY_0_PAD])
      strcat(nome,"0");
    else if(key[KEY_1_PAD])
      strcat(nome,"1");
    else if(key[KEY_2_PAD])
      strcat(nome,"2");
    else if(key[KEY_3_PAD])
      strcat(nome,"3");
    else if(key[KEY_4_PAD])
      strcat(nome,"4");
    else if(key[KEY_5_PAD])
      strcat(nome,"5");
    else if(key[KEY_6_PAD])
      strcat(nome,"6");
    else if(key[KEY_7_PAD])
      strcat(nome,"7");
    else if(key[KEY_8_PAD])
      strcat(nome,"8");
    else if(key[KEY_9_PAD])
      strcat(nome,"9");
    else if(key[KEY_0])
      strcat(nome,"0");
    else if(key[KEY_1])
      strcat(nome,"1");
    else if(key[KEY_2])
      strcat(nome,"2");
    else if(key[KEY_3])
      strcat(nome,"3");
    else if(key[KEY_4])
      strcat(nome,"4");
    else if(key[KEY_5])
      strcat(nome,"5");
    else if(key[KEY_6])
      strcat(nome,"6");
    else if(key[KEY_7])
      strcat(nome,"7");
    else if(key[KEY_8])
      strcat(nome,"8");
    else if(key[KEY_9])
      strcat(nome,"9");
  }
  if(key[KEY_BACKSPACE]) {
    tam = strlen(nome);
    if (tam > 0)
      nome[tam-1] = '\0';
  }

}

0


Apparently the problem was a bond that surrounded that code region or the region that I called printf("%c", cmd);. I can’t remember, it’s been three years.

Who had a similar problem: take care of your ties (I don’t understand how you got so many up’s this question).

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