1install_allegro(3)              Allegro manual              install_allegro(3)
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NAME

6       install_allegro - Initialise the Allegro library.
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SYNOPSIS

9       #include <allegro.h>
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12       int     install_allegro(int     system_id,    int    *errno_ptr,    int
13       (*atexit_ptr)());
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DESCRIPTION

16       Initialises the Allegro library. You must call  either  this  or  alle‐
17       gro_init() before doing anything other than using the Unicode routines.
18       If you want to use a text mode other than UTF-8, you can  set  it  with
19       set_uformat()  before  you  call  this. The other functions that can be
20       called before this one will be marked explicitly in the  documentation,
21       like set_config_file().
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23       The  available  system ID codes will vary from one platform to another,
24       but you will almost always want  to  pass  SYSTEM_AUTODETECT.  Alterna‐
25       tively,  SYSTEM_NONE  installs  a stripped down version of Allegro that
26       won't even try to touch your hardware or do anything platform specific:
27       this  can  be  useful  for situations where you only want to manipulate
28       memory bitmaps, such as the text mode datafile tools or the Windows GDI
29       interfacing functions.
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31       The  `errno_ptr'  and `atexit_ptr' parameters should point to the errno
32       variable and atexit function from your libc: these are required because
33       when  Allegro is linked as a DLL, it doesn't have direct access to your
34       local libc data. `atexit_ptr' may be NULL, in which  case  it  is  your
35       responsibility to call allegro_exit() manually. Example:
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37          install_allegro(SYSTEM_AUTODETECT, &errno, atexit);
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RETURN VALUE

40       This  function returns zero on success and non-zero on failure (e.g. no
41       system driver could be used). Note: in  previous  versions  of  Allegro
42       this function would abort on error.
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SEE ALSO

46       allegro_init(3), allegro_exit(3), set_uformat(3), set_config_file(3)
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50Allegro                          version 4.2.2              install_allegro(3)
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