[Cython] Accessing C attributes from Python functions in the interpreter

[Johannes Wienke]

Hi,

maybe I've just got a lack of understanding or I don't know...

I've got a class that in general looks like this:

cpdef class Foo:
	cdef char* myData

	cdef void setData(Foo self, char *data)
		self.myData = data

	cpdef doSomething(Foo self)
		print self.myData

The problem is that working with myData directly from Cython is no
problem but calling doSomething from the python interpreter causes a
segfault because self.myData then points to NULL. I've also observed
that self in setData points to a different address than self in
doSomething if it is called from the interpreter.

What's the problem with this approach?

Thanks
Johannes

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