Torsten Bronger wrote:
> Hallöchen!
>
> I'd like to script C++ funtions by an embedded Python interpreter.
> So far, my C++ main() function contains:
>
> Py_Initialize();
> Py_InitModule("pp3", PythonMethods);
> PyRun_SimpleString("from pp3 import *");
> PyRun_AnyFile(stdin, NULL);
> Py_Finalize();
>
> "PythonMethods" is the vector of type PyMethodDef that contains the
> function descriptors:
>
> static PyMethodDef PythonMethods[] = {
> {"toll", py_toll, METH_VARARGS, ""},
> {NULL, NULL, 0, NULL}
> };
>
> Then I say "toll()" in the input script which calls py_toll() in the
> C++ source.
>
>
> It works. However, is there a way to avoid this dummy "pp3" module
> and add the C++ functions directy to the main namespace in the
> Python script?
Yes. You can import __builtin__, and add methods to it.
This is a snippet from the bdist_wininst code, which embeds Python:
http://svn.python.org/view/python/trunk/PC/bdist_wininst/install.c?rev=38414&view=markup
PyMethodDef meth[] = {
{"create_shortcut", CreateShortcut, METH_VARARGS, NULL},
{"get_special_folder_path", GetSpecialFolderPath, METH_VARARGS, NULL},
{"get_root_hkey", (PyCFunction)GetRootHKey, METH_NOARGS, NULL},
{"file_created", FileCreated, METH_VARARGS, NULL},
{"directory_created", DirectoryCreated, METH_VARARGS, NULL},
{"message_box", PyMessageBox, METH_VARARGS, NULL},
};
...
mod = PyImport_ImportModule("__builtin__");
if (mod) {
int i;
for (i = 0; i < DIM(meth); ++i) {
PyObject_SetAttrString(mod, meth[i].ml_name,
PyCFunction_New(&meth[i], NULL));
}
}
...
Thomas
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