[fpc-pascal] Get value of PPChar ?

[Christo Crause]

I suppose you have to allocate memory and create a pointer to a pointer to
this memory which you pass to the function.
On 16 Apr 2017 4:58 PM, "fredvs" <fiens at hotmail.com> wrote:

> Hello.
>
> A C method is defined like this:
>
> MPG123_EXPORT int mpg123_icy(mpg123_handle *mh, char **icy_meta);
>
> and translated in Pascal with this:
>
> function mpg123_icy(mh: Tmpg123_handle; var icy_meta: PPChar): integer;
> cdecl;
>
> OK, the function seems to work because the result = 0 (no error).
>
> But how to retrieve the data icy_meta (PPChar) ?
>
> var
> theicytag : PPChar;
> resu : integer;
> ...
>
> resu := mpg123_icy(ahandle, theicytag);
> if resu = 0 then writeln(theicytag^); --> raise exception + crash
>
> resu := mpg123_icy(ahandle, theicytag);
> if resu = 0 then writeln(theicytag^^); --> also raise exception + crash
>
> Fre;D
>
>
>
>
>
> -----
> Many thanks ;-)
> --
> View this message in context: http://free-pascal-general.
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