install_allegro(3alleg4) Allegro manual install_allegro(3alleg4)NAME
install_allegro - Initialise the Allegro library.
int install_allegro(int system_id, int *errno_ptr, int (*atexit_ptr)());
Initialises the Allegro library. You must call either this or allegro_init() before doing anything other than using the Unicode routines.
If you want to use a text mode other than UTF-8, you can set it with set_uformat() before you call this. The other functions that can be
called before this one will be marked explicitly in the documentation, like set_config_file().
The available system ID codes will vary from one platform to another, but you will almost always want to pass SYSTEM_AUTODETECT. Alterna-
tively, SYSTEM_NONE installs a stripped down version of Allegro that won't even try to touch your hardware or do anything platform spe-
cific: this can be useful for situations where you only want to manipulate memory bitmaps, such as the text mode datafile tools or the Win-
dows GDI interfacing functions.
The `errno_ptr' and `atexit_ptr' parameters should point to the errno variable and atexit function from your libc: these are required
because when Allegro is linked as a DLL, it doesn't have direct access to your local libc data. `atexit_ptr' may be NULL, in which case it
is your responsibility to call allegro_exit() manually. Example:
install_allegro(SYSTEM_AUTODETECT, &errno, atexit);
This function returns zero on success and non-zero on failure (e.g. no system driver could be used). Note: in previous versions of Allegro
this function would abort on error.
SEE ALSO allegro_init(3alleg4), allegro_exit(3alleg4), set_uformat(3alleg4), set_config_file(3alleg4)Allegro version 4.4.2 install_allegro(3alleg4)
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