Re: Python Interactive Interpreter Breakage

[Simon Eves]

Simon Eves wrote:

I am trying to write a Python module to embed the functionality of
Maya (the 3D modelling and animation application from Autodesk,
formerly Alias) for doing scripted scene manipulation and rendering
processes in Python.

Here are both versions of the code, in case what I wrote didn't make sense.

Simon

#include "Python.h"

#include "maya/MStatus.h"
#include "maya/MLibrary.h"
#include "maya/MGlobal.h"


// global init
static bool _mayaInitialized = false;


static PyObject* maya_initialize(PyObject* self, PyObject* args)
{
        if (!_mayaInitialized)
        {
                // initialize Maya
                // script output to stdout
                // view-only license
                MStatus status = MLibrary::initialize(true, "mayamodule", true);
                if (status != MS::kSuccess)
                {
                        printf("// Error: Failed to initialize Maya, 
exiting...\n");
                        exit(1);
                }
                
                // remember
                _mayaInitialized = true;
        }
        else
                printf("// Warning: Maya already initialized\n");

        Py_INCREF(Py_None);
        return Py_None;
}


static PyObject* maya_mel(PyObject* self, PyObject* args)
{
        const char* command;
        if (PyArg_ParseTuple(args, "s", &command))
        {
                printf("Executing '%s'...\n", command);
                MStringArray results;
                MStatus status = MGlobal::executeCommand(MString(command), 
results);
                if (status != MS::kSuccess)
                        printf("// Error: %s\n", status.errorString().asChar());
                else
                        for (unsigned int i = 0; i < results.length(); i++)
                                printf("// %s\n", results[i].asChar());
        }

        Py_INCREF(Py_None);
        return Py_None;
}


static PyObject* maya_cleanup(PyObject* self, PyObject* args)
{
        // shut down Maya
        if (_mayaInitialized)
        {
                printf("// Shutting down Maya");
                MLibrary::cleanup();
        }

        // this will never be reached since MLibrary::cleanup() does an exit()
        Py_INCREF(Py_None);
        return Py_None;
}


static PyMethodDef maya_methods[] =
{
        {"initialize",  maya_initialize,        METH_NOARGS,    "Initialize 
Maya library"},
        {"mel",                 maya_mel,                       METH_VARARGS,   
"Execute arbitrary MEL command"},
        {"cleanup",             maya_cleanup,           METH_NOARGS,    "Shut 
down Maya library and exit"},
        {NULL, NULL}
};


PyMODINIT_FUNC
initmaya()
{
        printf("// mayamodule v1.0\n");

        Py_InitModule("maya", maya_methods);
}

#include <stdlib.h>
#include <stdio.h>

#include <Python.h>

#include <maya/MLibrary.h>
#include <maya/MGlobal.h>
#include <maya/MString.h>
#include <maya/MStringArray.h>


PyObject*
mel(PyObject* self, PyObject* args)
{
        const char* command;
        if (PyArg_ParseTuple(args, "s", &command))
        {
                printf("Executing '%s'...\n", command);
                MStringArray results;
                MStatus status = MGlobal::executeCommand(MString(command), 
results);
                if (status != MS::kSuccess)
                        printf("// Error: %s\n", status.errorString().asChar());
                else
                        for (unsigned int i = 0; i < results.length(); i++)
                                printf("// %s\n", results[i].asChar());
        }

        Py_INCREF(Py_None);
        return Py_None;
}


PyMethodDef mayaMethodTable[] =
{
        {"mel", mel, METH_VARARGS, "Run MEL Command"},
        {NULL, NULL}
};


int main(int argc, char** argv)
{
        printf("// pymaya v1.0\n");

        // get filename
        if (argc > 2)
        {
                fprintf(stderr, "Usage: pymaya [<filename>]\n");
                exit(1);
        }

        // initialize Maya
        if (MLibrary::initialize(true, argv[0], true) != MS::kSuccess)
                exit(1);

        // initialize Python
        Py_Initialize();

        // add and initialize the module
        PyImport_AddModule("maya");
        Py_InitModule("maya", mayaMethodTable);

        // import it so that the scene file doesn't have to
        PyRun_SimpleString("from maya import mel\n");

        if (argc == 2)
        {
                MString command = MString("execfile('") + MString(argv[1]) + 
MString("')");
                PyRun_SimpleString(command.asChar());
        }
        else
                PyRun_InteractiveLoop(stdin, "stdin");

        // shut down Python
        Py_Finalize();

        // shut down Maya (and exit)
        MLibrary::cleanup(0);
}


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