Embedding Python

Engines and Middleware Programming

Started by WarPig November 13, 2003 11:41 AM

7 comments, last by WarPig 20 years, 4 months ago

WarPig

122

Author

November 13, 2003 11:41 AM

Hi I''m using Boost.Python and trying to embedde Python into C++ app. Take a look on this minimalistic code:


#include <Python.h>
#include <boost/python.hpp>
using namespace boost:ython;

char const* please_work()
{
  return "Thank God!";
}


BOOST_PYTHON_MODULE(testme)
{
  def("please_work", please_work);
}

int main()
{
  Py_Initialize();

  PyRun_SimpleString("import testme\n"
                     "print testme.please_work()\n");
  Py_Finalize();
  return 0;
}

Compile & run and I''ve got: ImportError: No module named testme Huh ? Did I forget something ? no more war pigs of the power

no more war pigs of the power

Fruny

1,658

November 13, 2003 11:55 AM

You need to notify python that the testme module is a builtin module.
That is, it doesn't exist as an external script but is part of the binary itself.
(like sys, math... which are compiled into the python interpreter)

To do so, use the PyImport_AppendInittab() function before Py_Initialize().

PyImport_AppendInittab("testme", inittestme);Py_Initialize();PyRun_SimpleString("import testme\n""print testme.please_work()\n");Py_Finalize();

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan

iceryeah

122

November 21, 2003 12:50 AM

First:
Make a DLL project
Second:
Add your codes,and make sure your project name is same with Dll project.

game design

WarPig

122

Author

December 07, 2003 01:55 PM

Thanks Fruny, I needed that.

I have another question. Suppose some script uses Simple Generators. Now, this script would be executed from C++ ... is it possible that after yield statement control would be returned to C++ app ? Or there is some other way to stop script execution, save it state, execute C++ code and next continue at resumed line ?

no more war pigs of the power

Kylotan

10,510

December 15, 2003 12:12 PM

thedustbustr

191

December 15, 2003 01:42 PM

quote:Original post by WarPig
I have another question. Suppose some script uses Simple Generators. Now, this script would be executed from C++ ... is it possible that after yield statement control would be returned to C++ app

I found it easier to write my script scheduler in python, and have this scheduler call out to the generator scripts. The scheduler is called once per frame in c++ (through the very-high-level embedding). It is up to the generator scripts to remember to yield execution- if they don''t keep this in mind, the script will block execution.

Sample code:
http://urbanhunting.com/~dustin/katana2/script.cpp
http://urbanhunting.com/~dustin/katana2/internal.py
http://urbanhunting.com/~dustin/katana2/example.py

In my C++ mainloop I simply call Script::update() once per frame.

Dustin

WarPig

122

Author

December 15, 2003 04:02 PM

Big THX !!!

no more war pigs of the power

WarPig

122

Author

December 16, 2003 12:51 PM

Nice code thedustbustr, but what if I have to load scripts form virtual file system ?

no more war pigs of the power

Fruny

1,658

December 16, 2003 01:03 PM

Virtual filesystems ? Python 2.3 can import scripts directly from zip archives (PEP 273). Is that what you want ? Or do you want something like LUFS-Python ?

[edited by - Fruny on December 16, 2003 2:04:11 PM]

Embedding Python

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