[Swig-user] Accessing structure members from python file which has been initialized in C

[alvin <ala...@gm...>]

I'm new to python. I want to send a pointer to a structure from my C code to
a Python function, and then accessing the C structure from within Python. 

My structure is asa follows
*MyProject.i*
%module MyProject
%inline %{
struct argumentDetails
{
        char *argName;
        char *argType;
        int argSize;
};
struct SPythoned
{
        char *kerName;
        char *kerFileName;
        char *devType;
        int num_of_inputs;
        int num_of_outputs;
        struct argumentDetails *input_details;
        struct argumentDetails *output_details;
};
%}


*PyTest.py*
import MyProject

def TestObject(o):
        print "kenel name",o.kerName;
        print "kernel file name",o.kerFileName;
        print "dev type",o.devType;
        print "num_of_inputs ",o.num_of_inputs;
        for i in o.num_of_inputs:
                print "input ",o.input_details[i].argName


*main.cpp*
#include <stdio.h>
#include <Python.h>

extern "C"      // only needed when compiling in C++
{
        #include "MyProject_wrap.c"
}

// struct SPythoned is defined within MyProject_wrap.c just included above


void PythonTest(void)
{

        int i;
        Py_Initialize();        // Init Python
        SWIG_init();            // Initialise SWIG types
        init_MyProject();               // Init our project wrapped by Swig

        PyRun_SimpleString("import sys");
        PyRun_SimpleString("sys.path.append(\"./\")");

        SPythoned Object;
        PyObject *pMod, *pGlobalDict, *pFunc, *pResult, *pArg;

        Object.kerName = strdup("MatMatMul");
        Object.kerFileName = strdup("MatMatMul.cl");
        Object.devType = strdup("GPU");
        Object.num_of_inputs = 2;
        Object.num_of_outputs = 1;

        Object.input_details = (struct argumentDetails
*)malloc(Object.num_of_inputs * sizeof(argumentDetails));
        Object.output_details = (struct argumentDetails
*)malloc(Object.num_of_outputs * sizeof(argumentDetails));

        for(i=0;i<Object.num_of_inputs;i++)
        {
                Object.input_details[i].argName = strdup("a");
                Object.input_details[i].argType = strdup("float *");
                Object.input_details[i].argSize = 1024;
        }

        for(i=0;i<Object.num_of_outputs;i++)
        {
                Object.output_details[i].argName = strdup("b");
                Object.output_details[i].argType = strdup("float *");
                Object.output_details[i].argSize = 1024;
        }


        pMod = PyImport_ImportModule("PyTest"); // Load "PyTest.py" (it will
create a compiled version "PyTest.pyc")


        if (pMod)
        {

                pGlobalDict = PyModule_GetDict(pMod);   // Get main
dictionary

                if (pGlobalDict)
                {

                        pFunc = PyDict_GetItemString(pGlobalDict,
"TestObject");        // Look for function TestObject

                        if (pFunc)
                        {

                                pArg = SWIG_NewPointerObj((void*)&Object,
SWIGTYPE_p_SPythoned, 1);     // Get Python Object for our Structure Pointer

                                if (pArg)
                                {

                                        pResult =
PyObject_CallFunction(pFunc, "O", pArg);
                                        Py_CLEAR(pResult);
                                        printf("kername %s\tkerfilename
%s\tdevtype %s\n",Object.kerName,Object.kerFileName,Object.devType);
                                /*      for(i=0;i<2;i++)
                                        printf("object kername
%s\n",Object.ker_name[i]);*/
        //                              printf("\nobject kername
%s\n",Object.ker_names.ker_name[i]);

                                }
                        }
                }
        }

        Py_Finalize();
}

int main()
{
PythonTest();
return 0;
}



How can I access all the elements of a structre SPythoned from PyTest.py
file.?




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