Using pybind11 within C++ in JUCE Framework

Question

I'm trying to read a string list output from a Python script, in order to pass it to a JUCE MainComponent (written in C++).

The code is the following (which is a starting one, just to test the pybind library):

#include <pybind11/embed.h>
#include <pybind11/pybind11.h>
namespace py = pybind11;

MainComponent::MainComponent()
{
    auto math = py::module::import("math");
    auto resultobj = math.attr("sqrt")(2);
    double result = resultobj.cast<double>();
}

However, I always encounter the following error:

_PyRuntime.gc.**generation0** was nullptr.

Any suggestions? Thanks in advance

unddoch · Accepted Answer · 2022-02-05 10:08:27Z

1

You have to first initialize the Python interpreter, like this:

MainComponent::MainComponent()
{
    py::scoped_interpreter guard{};

    auto math = py::module::import("math");
    auto resultobj = math.attr("sqrt")(2);
    double result = resultobj.cast<double>();
}

You also have to link with the needed python libraries. In CMake, this means adding

target_link_libraries(your_target PRIVATE pybind11::embed)

to your CMakeLists.txt file.

answered Feb 5, 2022 at 10:08

unddoch

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3 Comments

Balthus89 Over a year ago

I have already added py::scoped_interpreter guard{}; but the error is still present.

Balthus89 Over a year ago

Moreover, the JUCE framework did not generate the CMakeLists.txt file. Maybe I wasn't able to retrive this file... do you know where it is located inside a JUCE project folder?

unddoch Over a year ago

I'm not sure how JUCE framework's build system works, but it seems to have CMake support (forum.juce.com/t/native-built-in-cmake-support-in-juce/38700)

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