Trying to call python functions from my GUI, compiler is out of heap space

SGaist

Hi,

Why are you including both since you want to use pybind11 ?

lfreeman6490

@SGaist I was told I needed both. Getting rid of the 'python.h' import and leaving in the 'pybind11' import does not get rid of the error. Getting rid of pybind11 but leaving in python.h does get rid of the error

SGaist

Which compiler are you using ?
On which platform ?

lfreeman6490

@SGaist I'm using QTCreator v3.0.1
c++ GUI
windows 10
32bit python 2.7

mrjj

@lfreeman6490

Hi and which compiler mingw or visual studio ?

lfreeman6490

@mrjj mingw

mrjj

@lfreeman6490
Hi
Im not sure if that is supported.
https://github.com/pybind/pybind11

Its not listed in compilers.

Also is this 32 bit mingw ?
or 64 ?

lfreeman6490

@mrjj It's 32 bit, I used pip to install it. If it is not supported are you aware of another way that I can call python functions?

mrjj

@lfreeman6490

From link
3, Microsoft Visual Studio 2015 Update 3 or newer

It does support visual studio 2015 it seems so that might work with 32 bit.

So you could install vs 2015 compiler if that can work with your app ?

lfreeman6490

@mrjj I've been headed this direction and I ditched pybind11, I have been able to get my python file to compile, but not much after that. My file is "test_py_file" and my function is "test_function". There are no errors being thrown at the moment, but also it is not executing the function.

void f_pathloss::on_pb_tester_connect_disconnect_clicked()
{

    PyObject *pName, *pModule, *pDict, *pFunc, *pValue, *presult;

    Py_Initialize();
    pName = PyString_FromString((char*)"test_py_file");
    pModule = PyImport_Import(pName);
    pDict = PyModule_GetDict(pModule);

    pFunc = PyDict_GetItemString(pDict, (char*)"test_function");


    Py_Finalize();
}

JonB

@lfreeman6490
You pasted this code elsewhere with the same comment. How do you/we know it is doing nothing? And I asked you whether you really have test_py_file and test_function in it, else what do you expect?

And I also suggested you try a different example @mrjj had quoted you.

It helps if we keep the same question in one thread....

mrjj

Hi
There is something missing

pFunc = PyDict_GetItemString(pDict, (char*)"test_function");

this gets you a function pointer but you do not call it.

something like
PyObject* myResult = PyObject_CallObject(pFunc , args)

args can be NULL if none is needed

lfreeman6490

@mrjj I decided to use pybind11, I'm still fighting off errors this way but it seems better. Thank you for the suggestions

mrjj

Hi
Well pybind11 is harder to get going but will be much nicer code-wise than the PyObject_xxxx interface for a more
complete integration but If you only need to call one function in python, pyBind11 might be a little overkill but
is then very future proof.

lfreeman6490

@mrjj yeah I've been struggling with pybind11 a ton so far. Haven't gotten much of anywhere really. But I am going to need to use a decent amount of functions from the Python file

mrjj

@lfreeman6490

Hi
What kind of errors ?

make sure to read the docs as its a bit hysteric with the compilers
https://pybind11.readthedocs.io/en/stable/basics.html

The PyObject_CallObject API didnt work for you or why did you give it up so fast ?