Re: [Swig-user] Casting in C# objects created in C++

[Marouane B. J. <mar...@ya...>]

Ok My example was not the reality, here a better description of the case:

I have a c++ method: Object getObject(int id);

I call for C# this method using the id of a Root.
So I get my Object in C#.
And then I do the Cast:
here is the C# code:
Object obj = FROMCPP.getObject(1);
Container container = (Container)obj;
!!! THIS CAST CRASH: InvalidCastException

Regards,
Marouane

--- En date de : Ven 4.6.10, David Piepgrass <dpi...@me...> a écrit :

> De: David Piepgrass <dpi...@me...>
> Objet: RE: [Swig-user] Casting in C# objects created in C++
> À: "Marouane BEN JELLOUL" <mar...@ya...>
> Date: Vendredi 4 juin 2010, 18h28
> > Here is the class Hierarchy
> > Abstract Object
> > Container : Object
> > Container3D<T> : Container
> > Root : Container3D<BLABLA>
> > 
> ...
> > 
> > Root root = new Root();
> > Object obj = root;
> > Container container = (Container)obj;
> > !!! THIS CAST CRASH: InvalidCastException
> 
> You claim that Root is derived from Container3DBLABLA and
> Container3DBLABLA is derived from Container. If that were
> true then you wouldn't NEED a cast from Root to Container.
> You should look at the code generated by SWIG to find out
> what it "thinks" the class hierarchy is.
> 
> I don't think %rename is a problem. %template is a bit
> tricky, you must use it in the right place. Make sure that
> the line
> 
> %template(Container3DBLABLA)
> MyNameSpace::Container3D<MyNameSpace::BLABLA>;
> 
> comes AFTER the definition of
> MyNameSpace::Container3D<T>, MyNameSpace::BLABLA,
> Container and Object but BEFORE the definition of Root.
> 
>