How to exchange data between Python and C++

cython
python c api
calling python functions from c
how to communicate between c++ and python
mixing c and python
c++ export data to python
message passing between c++ and python
python to c

I want to write a program in Python that reads 2 numbers (either from a text file or from user input) call a C++ function that takes 2 arguments (the 2 numbers) adds them and returns the result to the Python program. I've already managed to do this using a text file (saving the numbers from python there and then calling the file in the C++ program). But I want to do it directly instead of having to use a text file as a medium. I want to be able to call the function and send it the arguments directly rather than having it to read them from a text file and I would like to have the output returned to the original python code.

Any ideas as to how to proceed as I am fairly new in this area?

If you have two different programs, you need to use technologies for inter-process communication (pipes, sockets, signals, etc.).

If you want integrate C++ code to a python program, you may use Boost.Python or this document.

fastest way to share data between a C++ and Python program , This seems great, but I'm not sure if would be able to import whole library and use classes/methods (broker's client) in C++. Communicate through� It is able to use IPC between C++ and Python, what can be noticeably faster than using sockets (for the same usages), and gives you a window for network features in your future developments. It is reliable and quite easy to use, with the same API in Python and C++. It is often used with Protobuf to serialize and send data, even for high troughput.

Share data between C and Python with this messaging library , ZeroMQ provides an even easier process: Write a small shim in C that reads data from the hardware and sends whatever it finds as a message. Write a Python interface between the new and existing infrastructure. I now want to exchange information between python and C++. For example. I have 2 numbers in python which I call a program written in C, which adds those 2 numbers and returns the result to python.

A very powerful tool for integrating Python and C++ is called sip and it's the tool which the Qt binding PyQt is based on.

You can call functions and even map C++ classes to Python directly (including support for deriving in Python a C++ class).

Exchange Data between Python and C++ : learnprogramming, Exchange Data between Python and C++. I have just started learning programming. I have completed a lot of tutorials and online courses with regards to Python� I'm working on a project that is written in C++ and Python. The communication between the 2 sides is made through TCP sockets. Both processes run on the same machine.

Code to send argument from c++ to python

#include <windows.h>
 {
   system("start abc.py hi"); //here hi is argument sent to abc.py, you can always add more.

 return 0;
 }

Python code (save it as abc.py)

 import sys

 total = len(sys.argv)
 cmdargs = str(sys.argv)

 print ("The total numbers of args passed to the script: %d " % total)
 print ("Args list: %s " % cmdargs)


 # Parsing args one by one 
 print ("Script name: %s" % str(sys.argv[0]))
 print ("First argument: %s" % str(sys.argv[1]))
 print ("Second argument: %s" % str(sys.argv[2]))

To read more - (http://www.cyberciti.biz/faq/python-command-line-arguments-argv-example/)

5. Embedding Python in Another Application — Python 2.7.18 , When extending, you call a C routine, when embedding, you call a Python routine. This chapter will not discuss how to convert data from Python� As Aaron says In your exact case ctypes are the best choice. If it was a different language you could either use python's system call abilities to run the command for the c program and add the arguments as command line arguments. Another possibility would be to use pipelines. On mobile so no code examples sorry.:p

1. Extending Python with C or C++ — Python 3.4.10 documentation, The reverse is also useful: calling Python functions from C. This is especially To call the Python function with no arguments, pass in NULL, or an empty It has the same bad consequences as referencing uninitialized data� In Python you have access to RhinoCommon. It seems the most easy way to exchange data between C# and Python. dale (Dale Fugier) February 3, 2015, 6:46pm

Exchange Data between Python and C++ - Python, I now want to exchange information between python and C++. For example. I have 2 numbers in python which I call a program written in C,� 1 One possibility would be to use something like Python for.NET, which provides interop directly between C# and (standard, C) Python. Depending on what your Python routines need to do, IronPython can also be a good option, as this is directly consumable and usable from within C#.

Python Bindings: Calling C or C++ From Python – Real Python, How to pass data between C and Python; What tools and methods can help you create Python bindings. This tutorial is aimed at intermediate� Run the C++ code and the python code as two separate programs, in two separate processes, and use a IPC mechanism; Link the C++ code against your code, as grc suggested. The first option is probably better if you already have a complete complex C++ program written. Also, it's generally easier to debug and maintain.

Comments
  • You can use a pipe to communicate with the external program.
  • Python documents how to do this.
  • SWIG (swig.org/tutorial.html) makes it easy interfacing C/C++ code to Python.
  • So what is the difference in using SWIG, or a python wrapper or sockets/pipes etc?