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List:       kde-bindings
Subject:    Re: [Kde-bindings] Qyoto: SIGNALS/SLOTS
From:       Richard Dale <Richard_Dale () tipitina ! demon ! co ! uk>
Date:       2005-12-30 10:25:41
Message-ID: 200512301112.01726.Richard_Dale () tipitina ! demon ! co ! uk
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On Friday 30 December 2005 11:05, Richard Dale wrote:
> On Thursday 29 December 2005 23:19, Arno Rehn wrote:
> > > A QString return value would be marshalled to a C# string, which would
> > > be in a GCHandle in the 's_class' field of the C# array of SmokeItems.
> > > Similary Qt instances like QWidget need to end up as GCHandles in the
> > > 's_class' field. Primitive types are held directly in 's_int' or
> > > whatever in the SmokeItem. The only difference between the C++ array of
> > > SmokeItems, and the one built up in C# in SmokeInvocation.cs, is that
> > > non-primitive types are held as GCHandles, rather than as C++ pointers.
> >
> > By the way, how do we get the other types like a string out of the struct
> > in C++, when we call a method in C# like 'SetText' ? The GCHandle of the
> > string is stored in s_intptr in the C#-struct, but there is no equivalent
> > for this in the C++-struct. How can we access it in C++ then ?
>
> Have a look at the code the marshall_basetype() function in
> qt3handlers.cpp:
>
> 		smokeqyoto_object *o = value_obj_info(m->var().s_class);
>
> value_obj_info() in qt3qyoto.cpp obtains the smokeqyoto_object for the C#
> instance with a callback, and then the C++ instance is 'o->ptr'.
>
> smokeqyoto_object *value_obj_info(void * qyoto_value) {
>     smokeqyoto_object * o = (smokeqyoto_object*) (*GetSmokeObject)
> (qyoto_value);
>     return o;
> }
Actually I've described getting a C++ QWidget from a C# one, not how to get a 
QString from a C# string. See marshall_QString() for where that's done.

-- Richard
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