Re: [mpg123-devel] Code example of mpg123_index and mpg123_set_index

[Sven B. <s.b...@gm...>]

Hello,

so just a more question: You said " Of course,
when re-reading the index for handing it to mpg123_set_index(), you
need to allocate fill elements of the correct type and then store the
values there." What do you mean by re-reading the index? I thought
mpg123_index() wants a pointer to an array and tells after the call, how
much the array has been filled, or am I missunderstanding something? Maybe a
code example would be nice, of how to retreave the index and hand it to
another handle ;).

Thanks for your answers
Sven

Mit freundlichen Grüßen
Sven Baus
0175/49 50 309

-----Ursprüngliche Nachricht-----
Von: Thomas Orgis [mailto:tho...@or...] 
Gesendet: Dienstag, 25. September 2018 12:57
An: mpg...@li...
Cc: s.baus86
Betreff: Re: [mpg123-devel] Code example of mpg123_index and
mpg123_set_index

Am Tue, 25 Sep 2018 11:30:18 +0200
schrieb "s.baus86" <s.b...@gm...>: 

> Thanks for your mail. How should the array be initialised?

The argument to mpg123_index() is just a pointer without associated
memory. You get the size of the associated memory via fill. Of course,
when re-reading the index for handing it to mpg123_set_index(), you
need to allocate fill elements of the correct type and then store the
values there.

> Sorry for asking, but I'm not that familiar with C.

You need some understanding of C with pointers and data types. If in
doubt, try to read a bit more, the net is ripe with tutorials and
examples.

> int[] indexArray = new int[100]?! Or is it that simple?

If 100 is the number of elements, not some arbitrary fixed value, this
sounds about right for C++ (I'd write int* instead of int[]) except for
the fact that int is not the correct type. It is off_t. That an be
identical to int, but mostly will not be.


Alrighty then,

Thomas