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PycImport.h
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1 //# PycImport.h: Function to import a module and class in Python
2 //# Copyright (C) 2015
3 //# Associated Universities, Inc. Washington DC, USA.
4 //#
5 //# This library is free software; you can redistribute it and/or modify it
6 //# under the terms of the GNU Library General Public License as published by
7 //# the Free Software Foundation; either version 2 of the License, or (at your
8 //# option) any later version.
9 //#
10 //# This library is distributed in the hope that it will be useful, but WITHOUT
11 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 //# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
13 //# License for more details.
14 //#
15 //# You should have received a copy of the GNU Library General Public License
16 //# along with this library; if not, write to the Free Software Foundation,
17 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
18 //#
19 //# Correspondence concerning AIPS++ should be addressed as follows:
20 //# Internet email: aips2-request@nrao.edu.
21 //# Postal address: AIPS++ Project Office
22 //# National Radio Astronomy Observatory
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25 //#
26 //# $Id: PycExcp.cc,v 1.1 2006/10/17 03:33:50 gvandiep Exp $
27 
28 #ifndef PYTHON_PYCIMPORT
29 #define PYTHON_PYCIMPORT
30 
32 #include <casacore/casa/OS/Path.h>
33 
34 #include <boost/python.hpp>
35 
36 namespace casacore { namespace python {
37 
38  // This function can be used to create a Python class from C++.
39  // <br>It returns the object to be used to create a class instance.
40  // It initializes Python, imports the main module and the given
41  // module, and finally creates the class object.
42  // Before the import it adds the working directory to the Python
43  // module search path, because Boost-Python does not do that.
44  // <br>For example:
45  // <srcblock>
46  // // Create the class object.
47  // boost::python::object pyClass =
48  // casacore::python::PycImport("modulenm", "classnm");
49  // // Register the converters needed.
50  // casacore::python::register_convert_excp();
51  // casacore::python::register_convert_basicdata();
52  // casacore::python::register_convert_casa_valueholder();
53  // casacore::python::register_convert_casa_record();
54  // casacore::python::register_convert_std_vector<Bool>();
55  // casacore::python::register_convert_std_vector<Int>();
56  // casacore::python::register_convert_std_vector<String>();
57  // // Instantiate the Python class object with possible arguments
58  // // for the __init__ function.
59  // boost::python::object classObject = pyClass(arg1, arg2);
60  // // Invoke the 'setup' function in the Python object
61  // boost::python::object result =
62  // classObject.attr("setup")(arg1, arg2, arg3);
63  // // Extract the result (a dict in this case) as a Record.
64  // Record rec = boost::python::extract<Record>(result);
65  // </srcblock>
66 
67  boost::python::object PycImport (const String& moduleName,
68  const String& className);
69 
70 }}
71 
72 #endif
boost::python::object PycImport(const String &moduleName, const String &className)
This function can be used to create a Python class from C++.