I have Python embedded in a C++ application (yes, yes, I know, I'd prefer it the other way around too) and essentially need to expose some read-only values and functions to Python so it can be used to script the host application.
When scripting a similar app in TCL, it's possible to associate each command with some client data, so that the command can be written in the script as a free function but it actually executes in some sort of context, accessed via the client data pointer in C++. In Python, there doesn't appear to be this mechanism, so I think I'd have to inject the context in another way, either as some sort of module-level global, or as an object, implementing the previously free functions as methods. Is this correct? If so, what is the simplest way of implementing the former method - inserting the pointer to the required context as a long (via PyDict_SetItemString(globals, "context", PyInt_FromLong(pointer)) or similar) and then converting it back in the bound function? And for the latter method, is it possible to make an arbitrary object and then attach methods and the context data? Or will I have to create a whole Python class for this (as in http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/54352)? I'm not interested in wrapping whole C++ objects at this stage, and libraries like Boost::Python aren't currently an option. I just need a few pointers on doing it the low-level way for now. -- Ben Sizer -- http://mail.python.org/mailman/listinfo/python-list
