[C++-sig] pyCXX example of a callback
apocalypznow at gmail.com
Wed Nov 15 20:59:41 CET 2006
I gave up on Boost. Never could get it to build no matter what I did.
Thanks anyway, but I'm looking for a pyCXX solution.
Stefan Seefeld wrote:
> apocalypznow wrote:
>>Can anyone post a simple pyCXX example of a callback into python? My
> I don't know what 'pyCXX' is, so let's assume you mean boost.python.
>>python function should allow a string passed as a parameter, and returns
>>a string, ie:
>> s_out = dosomethingtoinputstringandreturnoutputstring(s_in)
>> return s_out
> The answer is very similar to one I gave in a previous question:
> namespace bpl = boost::python;
> bpl::dict global;
> bpl::exec_file("your_file.py", global, global); // load the definition
> bpl::object func = global["somepythonCP"]; // extract python function
> bpl::object retn = func(input); // call it with input string
> std::string value = bpl::extract<std::string>(retn); // extract return value
> The magic here is that boost.python already has builtin support for
> conversion between std::string and python's str.
> Please note that the 'exec_file' function is only in CVS, not in the last
> official release. See my previous posts for more on that.
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