problel of design

I have a design problem:

I have these classes:
app : application
res: resource
window: gui

what I want to make is:
windows: call a app->getResBmp(FILENAME) ;
windows: use string to loadfile

but:
I would want to find the way to be able to have like return value these:
String, Binari, ecc.

The solution simpler (but wrong) is a method for every resource and every returned type therefore

es:
--------------

class app{
res obj:res;
}

class res{
//two for type of resource
string getbmpString();
BYTE getbmpBinary();

string getSoundString();
BYTE getSoundBinary();

ecc.
}

res delegation to:
class bmpResource , class soundResource that they are derived they give class <<interface>>typeRisorce

window{
use :

//this
filename = res->getbmpString();
funcgui->loadfilename(filename) ;
//or
resource = res->getSoundString();
funcgui->loadfileresource(filename) ;
}

Have you consider using template ?

"yag" <yagyog@tiscali.it> wrote in message news:<qsphd.240251$35.11321442@news4.tin.it>...
> I have a design problem:
>
> I have these classes:
> app : application
> res: resource
> window: gui
>
> what I want to make is:
> windows: call a app->getResBmp(FILENAME) ;
> windows: use string to loadfile
>
> but:
> I would want to find the way to be able to have like return value these:
> String, Binari, ecc.
>
> The solution simpler (but wrong) is a method for every resource and
> every returned type therefore
>
> es:
> --------------
>
> class app{
> res obj:res;
> }
>
> class res{
> //two for type of resource
> string getbmpString();
> BYTE getbmpBinary();
>
> string getSoundString();
> BYTE getSoundBinary();
>
> ecc.
> }
>
> res delegation to:
> class bmpResource , class soundResource that they are derived they give
> class <<interface>>typeRisorce
>
> window{
> use :
>
> //this
> filename = res->getbmpString();
> funcgui->loadfilename(filename) ;
> //or
> resource = res->getSoundString();
> funcgui->loadfileresource(filename) ;
> }
>
> --