On Tue, Feb 26, 2008 at 2:11 AM, Kevin Watters <kev...@gm...> wrote:
> I'm new to Py++ but I've been experimenting with wrapping wxWidgets,
> the cross platform GUI library.
Let me know if you need help with this.
> It has gone fairly well, but I'm getting the following error and I'm
> not sure how to resolve it.
>
> In a header file somewhere, a global called "wxPanelNameStr" is declared:
>
> extern WXDLLEXPORT_DATA(const char) wxPanelNameStr[];
>
> The implementation is in a CPP file somewhere else:
>
> extern WXDLLEXPORT_DATA(const char) wxPanelNameStr[] = "panel";
>
> My problem arises in a constructor which uses wxPanelNameStr as the
> default value for one of its arguments:
>
> inline wxWindow(wxWindow *parent, wxWindowID winid,
> const wxPoint& pos = wxDefaultPosition,
> const wxSize& size = wxDefaultSize,
> long style = 0,
> const wxString& name = wxPanelNameStr)
>
> Py++ generates the following code for this:
>
> .def( bp::init< wxWindow *, wxWindowID, bp::optional< wxPoint
> const &, wxSize const &, long int, wxString const & > >((
> bp::arg("parent"), bp::arg("winid"), bp::arg("pos")=wxDefaultPosition,
> bp::arg("size")=wxDefaultSize, bp::arg("style")=(long int)(0),
> bp::arg("name")=wxPanelNameStr )) );
>
> You'll note that the sixth argument takes a value of type const
> wxString&, but the default argument in the generated code is const
> char []. The error I get is long and does lots of complaining about
> convertables and char[], but ultimately I think it boils down to this
> line:
>
> ../boost_1_34_1/boost/python/type_id.hpp:88: error: invalid use of
> array with unspecified bounds
>
> wxString does have a constructor which takes const char*, so the
> implicit conversion should happen, but I think Boost::Python is
> getting confused.
>
> Does anyone know how I can resolve this?
mb = module_builder_t( ... )
#find wxWindow constructor with 6 arguments of any type
wxWindow = mb.constructor( 'wxWindow', arg_types=[None]*6 )
wxWindow.arguments[-1].default_value = 'wxString( wxPanelNameStr )'
This should be enough.
I also will check whether Py++ can generate better code in this use-case.
--
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/
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