Allegro 5 assertion fail

Question

I am trying to load a bitmap with allegro 5.0.10

ALLEGRO_PATH *path = al_get_standard_path(ALLEGRO_RESOURCES_PATH);
al_set_path_filename(path, "Bitmap.bmp");

al_init_image_addon();
ALLEGRO_BITMAP *bmp = al_load_bitmap(al_path_cstr(path, '/'));
if (!bmp) {
    fprintf(stderr, "No Background.bmp in this directory...");
    return -2;
}

al_draw_bitmap(bmp, 0, 0, 0);

Once i tried to run the program in debug mode, i get this error:

Assertion failed!

Program: c:\allegro\bin\allegro-5.0.10-monolith-md-debug.dll
File: allegro-git\src\system.c
Line: 336

Expression: active_sysdrv

...

How do i fix this?

score 0 · Answer 1 · answered Nov 19 '13 at 20:36

0

You need to initialize allegro by calling al_init(). Very few Allegro functions can be called before doing that.

answered Nov 19 '13 at 20:36

Matthew

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I did not show the full code, but I did the necessary stuff already – junyi00 Nov 20 '13 at 03:06
@junyi00, if you had called `al_init()` you wouldn't get that error. – Matthew Nov 20 '13 at 14:51

score 0 · Answer 2 · answered Oct 18 '17 at 19:35

@junyi00, you need to make sure that you call al_init() before trying to load any resources. In your code above, make sure al_init() is already called before calling al_get_standard_path(ALLEGRO_RESOURCES_PATH), al_set_path_filename(path, "Bitmap.bmp"), al_load_bitmap(al_path_cstr(path, '/')) and basically all the Allegro functions from there. No other Allegro functions can be called before this function except one or two. See http://manpages.ubuntu.com/manpages/artful/en/man3/al_init.3alleg5.html and http://manpages.ubuntu.com/manpages/zesty/en/man3/al_install_system.3alleg5.html These are links to the al_init() and al_install_system() Allegro function manual pages

Allegro 5 assertion fail

2 Answers2