[C++-sig] problem embedding python - very simple example

[Cory Riddell]

Argh! I didn't notice that the example code I was trying was using
file() rather than open(). Sheeesh. After correcting this, I was able to
get it to work successfully! Step one on the thousand mile journey is
complete!

Cory


On 11/6/2012 1:40 PM, Cory Riddell wrote:
> I downloaded and installed the 32-bit version of Python 3.3. I
> downloaded and compiled boost-1.52.0. I've been able to build and run
> the tutorial Python extension but haven't been able to get anything but
> the most trivial example of embedding to work.
>
> My code (which compiles with no warnings):
>
>   #include <boost/python.hpp>
>
>   using namespace boost::python;
>
>   int main()
>   {
>     Py_Initialize();
>     object main_module = import("__main__");
>     object main_namespace = main_module.attr("__dict__");
>
>     exec("print('hello')\n", main_namespace);
>     exec("print('world')\n", main_namespace);
>     exec("f = file('hello.txt', 'w')\n", main_namespace);
>
>     return 0;
>   }
>
> It prints "hello\nworld\n" then throws an exception executing the line
> that creates the hello.txt file:
>   First-chance exception at 0x755ac41f in Test.exe: Microsoft C++
> exception: boost::python::error_already_set at memory location 0x0039fb60..
>   Unhandled exception at 0x773915de (ntdll.dll) in Test.exe: Microsoft
> C++ exception: boost::python::error_already_set at memory location
> 0x0039fb60..
>
> In the exec method, the exception is being thrown when result comes back
> as null:
>   PyObject* result = PyRun_String(s, Py_file_input, global.ptr(),
> local.ptr());
>   if (!result) throw_error_already_set();
>
> I'm using VS2010SP1 on Windows7 which I believe is what Python 3.3 is
> built with. I'm dynamically linking against boost.
>
> Any suggestions?
>
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