[directfb-dev] Re: DFB++ / windows

[simon.willcocks@t-online.de (Simon Willcocks)]

In message <1073581899.2857.27.camel@localhost>
          Joseph Wenninger <jowenn@kde.org> wrote:

> Hi
> 
> I'm trying to create window  with DFB++ 0.9.20.  I've tried the
> following code from the df_window.c example:
> 	DFBWindowDescription  desc;
> 	desc.flags = ( DWDESC_POSX | DWDESC_POSY |
>                          DWDESC_WIDTH | DWDESC_HEIGHT );
> 
> The problem is, that it looks like  gcc in  c++ mode treats enums
> differently than in c mode (int <-> "real typ" ?). flags is defined as
> 	DFBWindowDescriptionFlags          flags;
> which causes an error about an invalid cast from 'int' to
> 'DFBWindowDescriptionFlags'
> 
> Did nobody else try creating a window with the C++ API yet, or is there
> a work around, that I'm missing (except changing the definition in
> directfb.h to int/long), or a mistake on my side.

 desc.flags = DFBWindowDescriptionFlags( DWDESC_POSX | DWDESC_POSY |
                          DWDESC_WIDTH | DWDESC_HEIGHT );

works for me.  (I haven't looked it up, but it looks like enum -> int works,
but not int -> enum, without an explicit cast.)

For more dynamic flag manipulation, have a look at the DFB_ADD_DRAWING_FLAG
and other similar macros in dfb++.h for an approach that should presumably
be standard for DFB++.

Regards,
Simon


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