Hello, I have an extension module for a 3rd party library in which I am wrapping some structures. My initial attempt worked okay on Windows but failed on Linux. I was doing it in two parts. The first part on the C side of things I was turning the entire structure into a char array. The second part in Python code I would unpack the structure.
Anyway, I decided I should be doing things a little cleaner so I read up on "Defining New Types" http://docs.python.org/extending/newtypes.html I got it to work but I'm not sure how to create these new objects from C. My setup is almost exactly like the example on that page except instead of 2 strings and an integer I have 5 unsigned ints. I do not expect to ever be creating these objects in Python. They will only be created as return values from my wrapper functions to the 3rd party library. I could return a tuple from those functions but I want to use dot notation (e.g. somestruct.var1). So, question number 1: Is defining my own type like that overkill just to have an object to access using dots? I'll never create those objects from Python. Is there a shortcut to creating objects and setting attributes from within C? In any case, I was able to create my own custom object from C code like so... PyObject *foo(SomeCStruct bar){ PyObject *ret; ret = _PyObject_New(&mymodule_SomeStructType); PyObject_SetAttrString(ret, "var1" , Py_BuildValue("I", bar.var1 )); PyObject_SetAttrString(ret, "var2" , Py_BuildValue("I", bar.var2 )); PyObject_SetAttrString(ret, "var3" , Py_BuildValue("I", bar.var3 )); PyObject_SetAttrString(ret, "var4" , Py_BuildValue("I", bar.var4 )); PyObject_SetAttrString(ret, "var5" , Py_BuildValue("I", bar.var5 )); return ret; } When using _PyObject_New I notice that neither my new or init function are ever called. I verified that they are getting called when creating the object from Python (which I would never do anyway). Question number 2: Do I need to be calling PyObject_SetAttrString or is there a way to set the unsigned ints on the structure direcly? It seems overkill to create a Python object for an unsigned int just to set it as an attribute on a custom defined type. Question number 3: In the above code, is there a memory leak? Should I be Py_DECREF'ing the return value from Py_BuildValue after I'm done using it. -- http://mail.python.org/mailman/listinfo/python-list
