Exchange Data between Python and C++

[Jethro689]

I have just started learning programming. I have completed a number of tutorials with regards to Python Basics.

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.

Which is the simplest way to do this?

[computerfox]

Do you mean that you are getting the numbers by calling a C program from your Python code?
If you are printing the numbers in the C code, you can probably write it to a temporary file, gather the data in the Python code, then remove the temporary file.

#!/bin/python
import os
 
os.system("./cprog > temp.txt");
raw_data=open("temp.txt").read();
os.system("rm temp.txt");
print raw_data;
 

And you can make that work for other programs:

#!/bin/python
import os
 
def readc(cpath):
 os.system("'"+cpath+"' > temp.txt");
 raw_data=open("temp.txt").read();
 os.system("rm temp.txt");
 return raw_data;
 
print readc("cprog");
 

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[Jethro689]

Hi thanks for your response!

I have already successfully tried this method of reading from a text file and even saving it to a different one. My problem and lack of understanding focuses on 2 points:

1) How can i return the value to the python program
2) how to directly send data between the 2 programs? I mean how to call the C++ function and send the arguments directly from the python program rather than having the function to read it from a text file?

Thanks again for your help

[dwblas]

There is not enough information here. You can use subprocess to run a program and supply command line arguments, as well as retrieve anything printed, but I don't know if that is what you mean. See Doug Hellmann's Python Module of the Week on subprocess to see if it is what you want to do http://pymotw.com/2/subprocess/index...ule-subprocess