Fontconfig - Nov 2005 - Error accessing a FcConfig internal element

Ok, I solved the problem adding the file ''fcint.h'' into my
project. This
is the best solution?

At first I tryed to redefine FcConfig into the source code, but it
required to define also all of the inner variables... So I dicided to
include ''fcint.h'' into the source code...

Thanks again.

Em Sex, 2004-01-02 ?s 12:16, Adriano Del Vigna de Almeida escreveu:
> Hello folks,
> 
> I''m having a strange error. When I try to access some internal
> variable inside a FcConfig strucutre from a program I receive the
> following error:
> 
> gcc -I /usr/include/freetype2 `pkg-config --cflags glib-2.0`
> -lfontconfig `pkg-config --libs glib-2.0` main.c fontsbase.c
> fcconfighandlers.c -o fontman
> main.c: In function `ListAllFonts'':
> main.c:328: error: dereferencing pointer to incomplete type
> make: ** [all] Erro 1
> 
> /***** CODE SNIPET ******************************/
> 
> 
>     FcConfig *Config = NULL;
>     FcFontSet *FontSet = NULL;
>
>     FcPattern *Pattern = NULL;
>     FcObjectSet *ObjectSet = NULL;
>     FcChar8 *Family;
>
>     unsigned int count;
>
>     Config = FcInitLoadConfigAndAllFonts();
>     if(Config == NULL)
>     {
>         puts("Error on creating a Fontconfig configuration!");
>         return(0);
>     }
>
>     FcConfigSetCurrent(Config);
>
>     Pattern = FcPatternCreate();
>     ObjectSet = FcObjectSetBuild(FC_FAMILY, 0);
>     FontSet = FcFontList(0, Pattern, ObjectSet);
>
>     for(count = 0; count < FontSet->nfont; count++)
>     {
>         FcPatternGetString(FontSet->fonts[count], FC_FAMILY, 0,
> &Family);
> 
>         /** I GOT AN ERROR AT THIS LINE!!
> ****************************/
>         if(FcStrSetMember(Config->disabledFonts, Family))
>         /************************************************************/
> 
>             printf("%s\t\t!!DISABLED!!\n", Family);
>         else
>             printf("%s\n", Family);
>     }
> }
> 
> /******* END *******************************/
> 
> By the way, disabledFonts is a FcStrSet variable inside FcConfig
> structure. What I''m doing wrong? I have never seen this error
> before...
> 
> Thanks for the attention!
> 
> -- 
> Adriano Del Vigna de Almeida <katmandu@fs.inf.br>
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Oh! No, this not my idea... I only want to see what my disabledFonts
FcStrSet contains from a management program... I could add an API like
''FcConfigGetDisabledFonts'', this is my idea for know...

But thanks man!

Em Sex, 2004-01-02 ?s 15:09, Keith Packard escreveu:
> Around 12 o''clock on Jan 2, Adriano Del Vigna de Almeida wrote:
> 
> > By the way, disabledFonts is a FcStrSet variable inside FcConfig
> > structure. What I''m doing wrong? I have never seen this error
before...
> 
> The FcConfig datatype is not exposed to applications; it''s
entirely
> private to the fontconfig implementation.  If you want to add 
> ''disabledFonts'' to the implementation, you''ll
need to expose some kind of
> API that uses this datatype, preferably, the FcMatch, FcSort and FcList
functions
> would automatically use it to elide ''disabled'' fonts from
their results so
> that applications wouldn''t have to know about it.
> 
> -keith
> 
> 
> 
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Around 14 o''clock on Jan 2, Adriano Del Vigna de Almeida wrote:
> Ok, I solved the problem adding the file ''fcint.h'' into
my project. This
> is the best solution?
No.  fcint.h is an internal header file for use only within the library; 
it''s not installed and shouldn''t even be shipped in binary
releases of the
system.  If you do use this header file, I''m tempted to promise to
break
the data structure in arbitrary ways at the next release :-)

-keith

Around 12 o''clock on Jan 2, Adriano Del Vigna de Almeida wrote:
> By the way, disabledFonts is a FcStrSet variable inside FcConfig
> structure. What I''m doing wrong? I have never seen this error
before...
The FcConfig datatype is not exposed to applications; it''s entirely 
private to the fontconfig implementation.  If you want to add 
''disabledFonts'' to the implementation, you''ll need to
expose some kind of
API that uses this datatype, preferably, the FcMatch, FcSort and FcList
functions
would automatically use it to elide ''disabled'' fonts from
their results so
that applications wouldn''t have to know about it.

-keith

Hello folks,

I''m having a strange error. When I try to access some internal variable
inside a FcConfig strucutre from a program I receive the following
error:

gcc -I /usr/include/freetype2 `pkg-config --cflags glib-2.0`
-lfontconfig `pkg-config --libs glib-2.0` main.c fontsbase.c
fcconfighandlers.c -o fontman
main.c: In function `ListAllFonts'':
main.c:328: error: dereferencing pointer to incomplete type
make: ** [all] Erro 1

/***** CODE SNIPET ******************************/


    FcConfig *Config = NULL;
    FcFontSet *FontSet = NULL;

    FcPattern *Pattern = NULL;
    FcObjectSet *ObjectSet = NULL;
    FcChar8 *Family;

    unsigned int count;

    Config = FcInitLoadConfigAndAllFonts();
    if(Config == NULL)
    {
        puts("Error on creating a Fontconfig configuration!");
        return(0);
    }

    FcConfigSetCurrent(Config);

    Pattern = FcPatternCreate();
    ObjectSet = FcObjectSetBuild(FC_FAMILY, 0);
    FontSet = FcFontList(0, Pattern, ObjectSet);

    for(count = 0; count < FontSet->nfont; count++)
    {
        FcPatternGetString(FontSet->fonts[count], FC_FAMILY, 0,
&Family);

        /** I GOT AN ERROR AT THIS LINE!! ****************************/
        if(FcStrSetMember(Config->disabledFonts, Family))
        /************************************************************/

            printf("%s\t\t!!DISABLED!!\n", Family);
        else
            printf("%s\n", Family);
    }
}

/******* END *******************************/

By the way, disabledFonts is a FcStrSet variable inside FcConfig
structure. What I''m doing wrong? I have never seen this error before...

Thanks for the attention!

-- 
Adriano Del Vigna de Almeida <katmandu@fs.inf.br>
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I understand your concern with encapsulation. But in some situations it
is interesting to have access to the inner infromation of Fontconfig, I
mean, in a very few situations. Just like a big font manager, on top of
Fontconfig, I can''t see any other situation know...

I think that the data structure is very concise, and dont need any
modifications. Just a better way to access some hidden information,
something like the FcConfigGet* calls. I''ll see later if this idea is
good. See if the compiler can solve the indirection inserted by
''typedef
_FcConfig FcConfig'' construction.

With this sort of construction the compiler can''t resolve the internal
elements of structures, when accessed outside the lib. So a call
returning directly the info that I need doesn''t require a big change in
the data structure.

What do you think?

Em Sex, 2004-01-02 ?s 15:26, Keith Packard escreveu:
> Around 14 o''clock on Jan 2, Adriano Del Vigna de Almeida wrote:
> 
> > Ok, I solved the problem adding the file ''fcint.h''
into my project. This
> > is the best solution?
> 
> No.  fcint.h is an internal header file for use only within the library; 
> it''s not installed and shouldn''t even be shipped in
binary releases of the
> system.  If you do use this header file, I''m tempted to promise to
break
> the data structure in arbitrary ways at the next release :-)
> 
> -keith
> 
> 
> 
> _______________________________________________
> Fontconfig mailing list
> Fontconfig@fontconfig.org
> http://fontconfig.org/mailman/listinfo/fontconfig
> 
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