[Boost-users] Boost Python: Beyond handles

From: Paul Grenyer (paul_at_[hidden])
Date: 2003-11-10 09:03:32

Hi All

I'm trying to embed the python interpreter in a C++ program so that 
users can write simple scripts that can be executed when the program 
runs. I've been following the "Using the the Interpretter" examples an 
dhave had quite a lot of success, except with this one:

handle<> main_module(borrowed( PyImport_AddModule("__main__") ));

handle<> main_namespace(borrowed( PyModule_GetDict(main_module.get
()) ));

handle<> main_module( borrowed( PyImport_AddModule("__main__") ));

main_namespace dict(handle<>(borrowed( PyModule_GetDict(main_module.get
()) )));

handle<>( PyRun_String(" result = 5 ** 2", 
                         Py_file_input,
                         main_namespace.ptr(), 
                         main_namespace.ptr()) );

int five_squared = extract<int>( main_namespace["result"] );

I'm using boost 1.30.0 and MSVC 7.1, along with the following warning
(?!!):

builtin_converters.hpp(114) : warning C4267: 'argument' : conversion 
from 'size_t' to 'int', possible loss of data

I get the following errors:

 error C2146: syntax error : missing ';' before identifier 'dict'
 error C2039: 'ptr' : is not a member of 'boost::python::handle<>'
 error C2039: 'ptr' : is not a member of 'boost::python::handle<>'
 error C2676: binary '[' : 'boost::python::handle<>' does not define 
this operator or a conversion to a type acceptable to the predefined 
operator

The "missing ';' before identifier 'dict'" error I can understand and I 
ppear to be able to fix by swapping "main_namespace" for "handle<>". I 
can also fix the "'ptr' : is not a member of 'boost::python::handle<>'" 
error by changing ptr to get. However, the final error has me stumped.

Any suggestions appreciated.

Regards
Paul

Please note the change of email address!

Paul Grenyer
Email: paul_at_[hidden]
Web: www.paulgrenyer.co.uk