[Vala] How to generate binding for single headers?

["G.S.Alex" <sthots gmail com>]

I have some code written in c with gobject , now I want to use them in
vala , but vala-gen-introspect can only create bindings for library.

So : Is there any way to generate binding for single headers?

By the way , when i use the vala-gen-introspect , the object will have
a weak ref to the parent object , and lost the inheritance . Why is
this happen?