sdl_joystick.c

/*
  Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely.
*/

/* Simple program to test the SDL joystick routines */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL.h"


#ifndef SDL_JOYSTICK_DISABLED


int
main(int argc, char *argv[])
{
    const char *name, *type;
    int i;
    SDL_Joystick *joystick;

    SDL_SetHint(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, "0");

    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    /* Initialize SDL (Note: video is required to start event loop) */
    if (SDL_Init(SDL_INIT_JOYSTICK) < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
        exit(1);
    }

    /* Print information about the joysticks */
    SDL_Log("There are %d joysticks attached\n", SDL_NumJoysticks());
    for (i = 0; i < SDL_NumJoysticks(); ++i) {
        name = SDL_JoystickNameForIndex(i);
        SDL_Log("Joystick %d: %s\n", i, name ? name : "Unknown Joystick");
        joystick = SDL_JoystickOpen(i);
        if (joystick == NULL) {
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_JoystickOpen(%d) failed: %s\n", i,
                    SDL_GetError());
        } else {
            char guid[64];
            SDL_assert(SDL_JoystickFromInstanceID(SDL_JoystickInstanceID(joystick)) == joystick);
            SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(joystick),
                                      guid, sizeof (guid));

            SDL_Log("       axes: %d\n", SDL_JoystickNumAxes(joystick));
            SDL_Log("      balls: %d\n", SDL_JoystickNumBalls(joystick));
            SDL_Log("       hats: %d\n", SDL_JoystickNumHats(joystick));
            SDL_Log("    buttons: %d\n", SDL_JoystickNumButtons(joystick));
            SDL_Log("instance id: %d\n", SDL_JoystickInstanceID(joystick));
            SDL_Log("       guid: %s\n", guid);
            SDL_JoystickClose(joystick);
        }
    }
    SDL_QuitSubSystem(SDL_INIT_JOYSTICK);

    return 0;
}

#else

int
main(int argc, char *argv[])
{
    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL compiled without Joystick support.\n");
    exit(1);
}

#endif

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