Nsryjdtyk

I've chosen setuptools to use my C/C++ code from python scripts.
One of the phases when building such wrapper is to convert the C/C++ return value into python object.

So far I was able to convert simple primitive values and list of primitive values. However, I wish to extend it to multi-value struct, as shown in the example below.

My main challenge right now is how do I create the python struct representation (PyObject* ret = PyList_New(...);) and I do I set it's values properly with the different types.

I tried to create list of items from the same types (such as std::vector<float>) and manage to set the values properly using Py_BuildValue and PyList_SetItem, but I'm still struggling with the multi types...

typedef struct _fileParams 

{

    bool valid;

    int index;

    std::string key;

    std::value value;

} fileParams;



FileDataBase * db;



static PyObject *searchFileInDB(PyObject *self, PyObject *args)

{

    if (db == NULL) 

    {

        PyErr_SetString(PyExc_RuntimeError, "DB could not be initialized");

        return NULL;

    }



    char* fileName = NULL;

    int fileNameSize = 0;

    PyArg_ParseTuple(args, "s#", &fileName, &fileNameSize);

    try 

    {

        fileParams p;

        bool res = db->lookup(fileName, fileNameSize, p);

        PyObject* ret = PyList_New(...);



        if (res) 

        {                    

            PyObject* r1 = Py_BuildValue("b", p.valid);

            PyList_SetItem(ret, 0, r1);



            PyObject* r2 = Py_BuildValue("i", p.index);

            PyList_SetItem(ret, 1, r2);



            PyObject* r1 = Py_BuildValue("s", p.key);

            PyList_SetItem(ret, 2, r3);



            PyObject* r1 = Py_BuildValue("s", p.value);

            PyList_SetItem(ret, 3, r4);

        }

        return ret;

    } catch (...) {

        PyErr_SetString(PyExc_RuntimeError, "failed with C exception");

        return NULL;

    }

}

You probably want to look into the Dictionary Object: Dictionary Objects

I'm guessing you'd want to set values with PyDict_SetItemString() as per that doc.

HTH