Re: [Denemo-devel] Transpose

[Jeremiah Benham]

On Tue, 2008-08-12 at 11:35 +0100, Richard Shann wrote:
> On Mon, 2008-08-11 at 22:52 -0500, Jeremiah Benham wrote:
> > So in this instance the alias 
> I am not sure what you mean by alias here

I was confused with what you were doing. I thought:
 arraytype;
> arraytype interface_array[] = {
> {"Denemo_InsertBflatmaj",(void*) 0x816ac40},

was creating a alias called Denemo_InsertBflatmaj that really pointed to
(void*) 0x816ac40. This (void*) 0x816ac40 was really just a pointer to a
different function correct? I think this confused me. 

> > would point to a GValue containing what?
> > the function name and its arguments?
> > 
> > > GValue *value = g_malloc0(sizeof(GValue));
> > >     g_value_init(value, G_TYPE_BOOLEAN);
> > >     g_value_set_boolean(value,Denemo.gui->textview &&
> > > GTK_WIDGET_VISIBLE(Denemo.gui->textwindow));
> > >     g_object_set_property (G_OBJECT (widget), "active", value);
> > > 
> > > though you wouldn't normally generate them on the heap. 
> The Swig tutorial you pointed me to only had examples with parameters
> that were standard C types, 

No. I believe you can define your own structures and pass them to the
interface file. I think they have to be defined in the interface file or
defined in an included header. Page 69-74 on this old tutorial from
1998: 
http://www.swig.org/papers/PyTutorial98/PyTutorial98.pdf

shows a structure defined in the .i file like this
typedef struct {
     double x,y,z;
} Vector;

I will have to play around with it. The memory will have to be freed
somehow. 

> and indeed to invoke a function with some
> other type from the language would require some way of expressing the
> value of a custom type in the scripting language. 

I believe that can be done. 

Jeremiah

> I guess this is not
> available, but I am sure that once we have a basic (parameter-less)
> setup established we can devise something to read out modify and write
> back the values of things in Denemo. At which point this GValue stuff
> might be handy for checking that the type of the parameters is what was
> required by the called function.
> Richard
> 
> 
> 
> 
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