At Thursday 11/1/2007 18:37, Huayang Xia wrote:
I get a python object by running a class' constructor. Then I need to
modify the instance's attribute just like obj.attr1.attr2 = 'a' if in
python's term.
PyObject* py_obj_attr1 = PyObject_GetAttrString(obj, "attr1");
PyObject_SetAttrString(py_obj_attr1, "attr2",
PyString_FromString("a"));
Py_DECREF(py_obj_attr1);
The object py_obj_attr1 is said to be a "New reference". It's
confusing, does it refer to the same object as "obj.attr1" in python's
term? So that the above code equals: obj.attr1.attr2 = 'a' in python's
term.
Read the Introduction in the "Python/C API Reference Manual". If you
plan to use Python from C code, better learn carefully how reference
counting works, or your progam won't work at all (or crash, in
unrelated places, at a later time...)
Going back to the example, yes, it's like obj.attr1.attr2 = 'a'. But
you should check that py_obj_attr1 is not NULL, and the same for
PyString_FromString. There are examples in the doc cited and in
"Extending and Embedding".
--
Gabriel Genellina
Softlab SRL
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