Embedded and extending python 2.5: trouble with __main__ in PyRun_SimpleFileExFlags?

[Carl Douglas]

Hi Python fans,

I am developing a DLL that is loaded by a host application on windows.
 I'm using python 2.5.

My DLL uses an embedded python interpreter which can access the host
application through an API which I have exposed using SWIG 1.3.31.

Therefore I have both extended and embedded Python at once: the SWIG
generated code is statically linked into my DLL, and one of the
functions in my DLL executes PyRun_SimpleFile.

Using python25_d.dll, I stepped through some python code to understand
what is happening, and it appears that PyRun_SimpleFile is returning
-1 because python cannot create the module __main__.

Here's the code from pythonrun.c:

int
PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit,
			PyCompilerFlags *flags)
{
	PyObject *m, *d, *v;
	const char *ext;

	m = PyImport_AddModule("__main__");
	if (m == NULL)
		return -1;
.
.
.
}

BTW, PyImport_AddModule fails because deeper down a dictionary check fails:

	if (!PyDict_Check(op))
		return NULL;


Can someone suggest what I need to do to get this to work?

Here are the relevant lines from my code:

	if (GetOpenFileName(&ofn)==TRUE)
	{
		Py_Initialize();
		init_mymodule(); // SWIG generated method

		PyObject* PyFileObject = PyFile_FromString(ofn.lpstrFile, "r");

		if (PyRun_SimpleFile(PyFile_AsFile(PyFileObject), ofn.lpstrFile)==-1)
		{
			MessageBox(NULL, "error running script", "Python", MB_ICONERROR);
		}

		Py_DECREF(PyFileObject);

		Py_Finalize();
	}

Thanks.