install_allegro(3) Allegro manual install_allegro(3)NAMEinstall_allegro - Initialise the Allegro library.
SYNOPSIS
#include <allegro.h>
int install_allegro(int system_id, int *errno_ptr, int
(*atexit_ptr)());
DESCRIPTION
Initialises the Allegro library. You must call either this or alle‐
gro_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 specific:
this can be useful for situations where you only want to manipulate
memory bitmaps, such as the text mode datafile tools or the Windows 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);
RETURN VALUE
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 ALSOallegro_init(3), allegro_exit(3), set_uformat(3), set_config_file(3)Allegro version 4.4.2 install_allegro(3)
