I'm trying to create C code that creates an Python xmlrpc client and calls methods on the xmlrpc server (I'm thinking of using this as IPC for a hook DLL).
Here's the code ... I'm not going to layer in reference counting until it works.
#include <Python.h>
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
static PyObject *xmlrpc_server_proxy = NULL;
static PyObject *set_server_proxy(void);
static void say_hi(void);
int main()
{
xmlrpc_server_proxy = set_server_proxy();
say_hi();
return 0;
}
static PyObject *
set_server_proxy()
{
PyObject *xmlrpc_client_mod, *xmlrpc_server_proxy_class, *location, *args;
PyObject *result;
Py_Initialize();
xmlrpc_client_mod = PyImport_ImportModule("xmlrpc.client");
xmlrpc_server_proxy_class = PyObject_GetAttrString(xmlrpc_client_mod, "ServerProxy");
location = PyUnicode_FromString("http://127.0.0.1:8000/");
args = Py_BuildValue("(O)", location);
result = PyObject_CallObject(xmlrpc_server_proxy_class, args);
Py_Finalize();
return result;
}
static void say_hi()
{
PyObject_CallMethod(xmlrpc_server_proxy, "say_hi", "()");
}
I've confirmed that my Python xmlrpc server works fine when called from another Python server proxy. When I try to run the above executable, it crashes on the PyObject_CallMethod()
. Why?
Near the end of set_server_proxy()
you are calling Py_Finalize()
which destroys the interpreter, and subsequently you are calling say_hi()
which assumes the interpreter still exists. When the Python interprer code attempts to raise an error, the PyErr_Occurred()
function gets a pointer to the current thread state, which is NULL
; it dereferences it and this generates the segfault.
Move your interpreter initialization calls inside the main()
function:
int main()
{
Py_Initialize();
xmlrpc_server_proxy = set_server_proxy();
say_hi();
Py_Finalize();
return 0;
}
Secondarily, if you are trying to use Python's standard xmlrpclib.ServerProxy
you may need to change your import to:
xmlrpc_client_mod = PyImport_ImportModule("xmlrpclib");
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