How to redirect python interpreter output and catch it in a string in C++ program?

Question

i am using python C++ API to run python commands from C++ program. I want to catch all the python output to a string, I've managed by the following redirection, to catch pythons stdout and stderr output:

#python script , redirect_python_stdout_stderr.py
class CatchOutput:
    def __init__(self):
        self.value = ''
    def write(self, txt):
        self.value += txt
catchOutput = CatchOutput()
sys.stdout = catchOutput
sys.stderr = catchOutput

#C++ code
PyObject *pModule = PyImport_AddModule("__main__"); 
PyRun_SimpleString("execfile('redirect_python_stdout_stderr.py')"); 

PyObject *catcher = PyObject_GetAttrString(pModule,"catchOutput");

PyObject *output = PyObject_GetAttrString(catcher,"value");
char* pythonOutput = PyString_AsString(output);

But i don't know what to do to catch also pythons interpreter output ....

Have you read docs.python.org/extending/embedding.html ?

nmichaels
– nmichaels

2010-12-03 17:26:03 +00:00
Commented Dec 3, 2010 at 17:26 — nmichaels
– nmichaels, Commented Dec 3, 2010 at 17:26

Community · Accepted Answer · 2017-05-23 12:07:59Z

4

The Python interpreter will run inside your C++ process, so all its output will go to the stderr and stdout of the C++ program itself. How to capture this output is described in this answer. Note that with this approach you won't need to capture the output in the Python script any more -- just let it go to stdout and capture everything at once in C++.

edited May 23, 2017 at 12:07

CommunityBot

11 silver badge

answered Dec 3, 2010 at 17:29

Sven Marnach

608k123 gold badges966 silver badges865 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to redirect python interpreter output and catch it in a string in C++ program?

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related