Beginner's question : Embedding Python - problem with PyRun_SimpleString

[Adrian Eyre]

> Thanks for this tip. Actually I'm running under Win32 I need to figure out
> how to redirect stderr.

Well. Here's one way to do it (n.b. I haven't tested whether this compiles):

//-------------------------------------------------------------------------
// Catch method
static PyObject* catch(PyObject* self, PyObject* args)
{
    char* string;

    // Check args
    if (!PyArg_ParseTuple(args, "Os", &self, &string))
        return NULL;

    // Do something with string
    my_func(string);

    // And return
    Py_INCREF(Py_None);
    return Py_None;
}

//-------------------------------------------------------------------------
// Declare Python exports
static struct PyMethodDef catch_methods[] = {
    { "catch", catch, 1 },
    { NULL,    NULL,  0 }
};

//-------------------------------------------------------------------------
// Main
void main()
{
    Py_Initialise();
    PyObject* catch = Py_InitModule("catch_module", catch_methods);
    PyObject* catch_dict = PyModule_GetDict(catch);
    PyObject* catch_func = PyDict_GetItemString(catch_dict, "catch");
    PyObject* class_dict = PyDict_New();
    PyObject* empty_tuple = PyTuple_New(0);
    PyObject* class_name = PyString_FromString("Catch");
    PyObject* catch_class = PyClass_New(empty_tuple, class_dict,
class_name);
    PyObject* catch_meth = PyMethod_New(catch_func, 0, catch_class);
    PyDict_SetItemString(class_dict, "write", catch_meth);
    PyObject* catch_inst = PyInstance_New(catch_class, 0, 0);
    PySys_SetObject("stderr", catch_inst);
    Py_DECREF(class_dict);
    Py_DECREF(empty_tuple);
    Py_DECREF(class_name);
    Py_DECREF(catch_class);
    Py_DECREF(catch_meth);
    Py_DECREF(catch_inst);

    // Run Python code here
    PyRun_SimpleString("wibble");

    // Finish up
    Py_Finalize();
}

> What about for the normal output of a command ?
Anything you 'print' will go to stdout.

> Do I have to redirect stdout as well ?
If you want to catch this too, then yes.

--------------------------------------------
Adrian Eyre <mailto:a.eyre at optichrome.com>
Optichrome Computer Solutions Ltd
Maybury Road, Woking, Surrey, GU21 5HX, UK
Tel: +44 1483 740 233  Fax: +44 1483 760 644
http://www.optichrome.com
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