Python/C++ Data Exchange

Location: example/py-cpp-exchange/dragon

This example shows a Python driver launching a compiled C++ application and exchanging data with it through a shared Dragon DDict, using the radex Python client on one side and the C++ client on the other.

How It Works

driver.py:

1. Creates a Dragon DDict and serializes it.
2. Launches the compiled example binary (dragon-cpp-with-py, from install/bin/examples) as a Dragon Process, passing the serialized DDict through the SERIALIZED_DDICT environment variable.
3. Creates a radex DragonClient attached to the same DDict.
4. Writes values from Python that the C++ application reads, and vice versa.

from radex.clients.core import DragonClient as Client
from radex.handles.handles import IncomingHandle, OutgoingHandle

client = Client(serial_dd, 5)
client.put_scalar(OutgoingHandle("py-int"), 123)

The C++ side (built from app.cpp) attaches its own client to the same serialized DDict descriptor and reads/writes using the equivalent C++ API (see C++ Data Exchange).

Running

cd example/py-cpp-exchange/dragon
dragon driver.py