[C++-sig] problems compiling and embedding, boost-python

[Benjamin Collar]

Greetings

I'm trying for the first time to embed the python interpreter in my 
application. I'm using boost from today's CVS and gcc 3.3.1. I'm just trying 
to follow the example from the boost-python documentation. I've got two 
problems, one of which I solved and one I haven't. Any help would be 
appreciated.

When I try this:

handle<> main_module(borrowed( PyImport_AddModule("__main__") ));
handle<> main_namespace(borrowed( PyModule_GetDict(main_module.get()) ));
handle<>( PyRun_String("hello = file('hello.txt', 'w')\n"
                           "hello.write('Hello world!')\n"
                           "hello.close()", Py_file_input,
                           main_namespace.get(), main_namespace.get()) );

I get:
main.cc: In function `int main(int, char**)':
main.cc:37: error: no matching function for call to `
   boost::python::handle<PyObject>::handle(const char[73], int, PyObject*, 
   PyObject*)'
/home/bc/HEAD/muranxx3/include/boost/python/handle.hpp:129: error: candidates 
   are: 
   
boost::python::handle<T>::handle(boost::python::detail::borrowed_reference_t*)
   [with T = PyObject]
/home/bc/HEAD/muranxx3/include/boost/python/handle.hpp:110: error:              
      boost::python::handle<T>::handle(const boost::python::handle<T>&) [with 
T 
   = PyObject]
/home/bc/HEAD/muranxx3/include/boost/python/handle.hpp:187: error:              
      boost::python::handle<T>::handle() [with T = PyObject]


No Problem, all I have to do is replace the last function with:

handle<> x(PyRun_String(...)

If I declare a variable it compiles fine.

However, moving right along in the documentation, if I try to compile this:

    handle<> main_module(borrowed( PyImport_AddModule("__main__") ));
    dict main_namespace(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 get this, which I do not know how to resolve:

main.cc: In function `int main(int, char**)':
main.cc:33: error: variable declaration is not allowed here
main.cc:35: error: request for member `ptr' in `main_namespace()', which is of 
   non-aggregate type `boost::python::dict ()()'
main.cc:35: error: request for member `ptr' in `main_namespace()', which is of 
   non-aggregate type `boost::python::dict ()()'
main.cc:36: error: invalid types `boost::python::dict ()()[const char[7]]' for 
   array subscript
main.cc:36: warning: unused variable `int five_squared'

What's up with this last one?

Thanks
Ben

-- 
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(o__      Benjamin Collar
//\       GAMIC mbH  ++49 (0)241 889 110
V_/_      Developer/System Administrator 

To know recursion, you must first know recursion