Re: [Vala] Embed Python into Vala, extend Vala with Python

[Frederik <scumm_fredo gmx net>]

ecir hana wrote:
> However, I'm slowly getting lost:
> - during compiling, valac says:
> pythondemo3.vala.c:43: warning: passing arg 2 of `Py_InitModule4'
> discards qualifiers from pointer target type
> Is this what you said below about 'emb_methods' being constant?

Yes, that's what I meant.

> - looking in your .vapi, what does it mean "..."? Variable number of arguments?

Yes, see: http://www.python.org/doc/1.5.2p2/ext/buildValue.html

This only works in bindings. Currently there's no support for
self-defined functions with variable number of arguments in Vala.

> - and what does it mean, that class Object is empty? Doesn't it
> matter? Or better yet, what should be inside?

Yes, it doesn't matter for this example. I'm guess there are some
functions ("methods") that operate on PyObject and could belong there.

> - arg_parse_tuple(), when converting Python strings to C strings
> expects char pointer, is it ok to write &s in Vala?

'char' pointers are usually 'string' in Vala. In your case it's an 'out'
parameter. Your program will work with:

  unowned string s;
  if (!Python.arg_parse_tuple (args, "s", out s)) {
        // ...
  }

's' must be unowned, otherwise Vala would try to free it.


Best regards,

Frederik