NAME

       load_datafile_callback  - Loads a datafile into memory, calling a hook per object. Allegro
       game programming library.

SYNOPSIS

       #include <allegro.h>

       DATAFILE *load_datafile_callback(const char *filename, void (*callback)(DATAFILE *d));

DESCRIPTION

       Loads a datafile into memory, calling the specified hook function once for each object  in
       the file, passing it a pointer to the object just read. You can use this to implement very
       simple loading screens where every time the hook is called, the screen is updated  to  let
       the user know your program is still loading from disk:

          void load_callback(DATAFILE *dat_obj)
          {
             static const char indicator[] = "-\\|/-.oOXOo.";
             static int current = 0;

             /* Show a different character every time. */
             textprintf_ex(screen, font, 0, 0, makecol(0, 0, 0),
                           makecol(255, 255, 255), "%c Loading %c",
                           indicator[current], indicator[current]);
             /* Increase index and check if we need to reset it. */
             current++;
             if (!indicator[current])
                current = 0;
          }
             ...
             dat = load_datafile_callback("data.dat", load_callback);

RETURN VALUE

       Returns  a  pointer to the DATAFILE or NULL on error. Remember to free this DATAFILE later
       to avoid memory leaks.

SEE ALSO

       load_datafile(3alleg4),      unload_datafile(3alleg4),      load_datafile_object(3alleg4),
       set_color_conversion(3alleg4),     fixup_datafile(3alleg4),    packfile_password(3alleg4),
       find_datafile_object(3alleg4), register_datafile_object(3alleg4)