Getting boost.python to work

[h3ro]

Hallo,

I want to try and integrate python into my code, but I am having some problems with it. I decided to use boost to help me, but so far it has caused me nothing but trouble.

This works, which makes me believe that python is correctly installed

#include <iostream>
#include "Python.h"

int main()
{
	return 0;
}

This does not work (from the boost.pythons help file)

#include <boost/python/module.hpp>
#include <boost/python/def.hpp>

char const* greet()
{
   return "hello, world";
}

BOOST_PYTHON_MODULE(hello_ext)
{
    using namespace boost::python;
    def("greet", greet);
}

Here is the error:
1>LINK : fatal error LNK1104: cannot open file 'boost_python-vc90-mt-1_37.lib'

I am using Visual Studio 2008 and Vista.
Linker settings:
additional include directories: C:\Python26\include;"C:\Program Files\boost_1_37_0"
additional library directories: C:\Python26\libs;"C:\Program Files\boost_1_37_0\libs"

Apart from that it is default console project.

Any ideas?

[Codeplug]

You probably have to build the libraries first. Follow these steps: http://www.boost.org/doc/libs/1_37_0...es-from-source

gg

[h3ro]

All the other boost functions I have tried to use worked without building it.

[Codeplug]

http://www.boost.org/doc/libs/1_37_0...only-libraries

gg

[h3ro]

Codeplug: Thanks for pointing that out

I have now built the library successfully( I think, thanks to Vista for making basic stuff a pain)

When I try to compile now I get this:

1>Compiling...
1>main.cpp
1>Linking...
1> Creating library C:\Users\Ole\Documents\Visual Studio 2008\Projects\BoostPhyton\Debug\BoostPhyton.lib and object C:\Users\Ole\Documents\Visual Studio 2008\Projects\BoostPhyton\Debug\BoostPhyton.exp
1>MSVCRT.lib(crtexe.obj) : error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup
1>C:\Users\Ole\Documents\Visual Studio 2008\Projects\BoostPhyton\Debug\BoostPhyton.exe : fatal error LNK1120: 1 unresolved externals

Same source code as above.

[tabstop]

The manual says, directly under that example,

We can now build this as a shared library. The resulting DLL is now visible to Python.

In other words, this isn't a program.

[h3ro]

OK, I think I am getting there now.

I finally got the project to compile.
I created a empty win32 console project which is configured for creating .dll files

The code for the .dll file:

#include <boost/python/module.hpp>
#include <boost/python/def.hpp>

char const* greet()
{
   return "hello, world";
}

BOOST_PYTHON_MODULE(hello_ext)
{
    using namespace boost::python;
    def("greet", greet);
}

The code for the python file

import hello_ext

print hello_ext.greet()
raw_input("Press return to close this window...")

The output from the program:
ImportError: No module named hello_ext.

The python file is in the same folder as the dll. The dll file is called hello_ext.dll

Any ideas to whats the problem now?

[tabstop]

I've never used boost:ython, or python for that matter, but the python docs state that when searching for modules, they will look for files that end in .py or .pyc. I have no idea whether renaming the file will work (it should certainly be found, but I have no idea what the file format should look like).