[SPAM: 4.000] Re: [Pyrex] Callback with bound method

[Greg Ewing]

On Thu, Jul 08, 2004 at 03:52:51AM +0800, ha shao wrote:
> It seems that the recommend way of wrapping callbacks is using bound
> methods. By my attempt to do it failed:

> cdef class CBClass:
>     ...
>     cdef void action(self, void *userdata):
>         self._callback(<object>userdata)
>
> def addhook(acb, adata):
>     ...
>     add_cb(cbobj.action, <void*> adata)

You're trying to create a bound method from a C method,
which won't work. There is no such thing as a bound C method,
only bound Python methods.

The function you install as the C callback must be a
top-level C function (not a method). All the context it
needs will have to be passed in via the userdata somehow.

Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury,	   | A citizen of NewZealandCorp, a	  |
Christchurch, New Zealand	   | wholly-owned subsidiary of USA Inc.  |
greg at cosc.canterbury.ac.nz	   +--------------------------------------+