OpenEuphoria

Re: How to deal with C_POINTR?

• Posted by stabmaster_ at hotmail.com Mar 31, 2003
• 569 views

I guess you could receive a structure using some assembly code, though i 
don't know how structs are returned by value. Can't exactly put in a 
register, so the stack would be probable.. Anyway, I can't see in what 
situation anyone would like to pass/return structs by value. If it's a dll 
written by someone else and you have the source code, then by all means fix 
it to do it the proper way (i.e. using pointers).


> > >when define and call c_func often there are parameters passed by
> > >pointers, then how to send and get data if it is a c struct?
> >
> > Let's say you have:
> >
> > typedef struct
> > {
> >   int a,b;
> > } foo;
> >
> > foo *bar(foo *grill)
> > {
> >   return grill;
> > }
>
>The problem though is when you have something like ...
>
>  foo bar(foo grill)
>{
>   return grill;
>}
>
>In other words, the struct is passed by value, not as a pointer to struct.
>
>In this case, it is difficult. Sometimes, if the stuct ONLY has 32-bit
>values in it, you can fake passing it as a set of C_UINT values, but
>returning a struct is impossible, I suspect.
>