[C++-sig] std::string crush

[Vladimir Ignatov]

Hello!

I am just start learning Boost.Python and faced a strange problem.  I need
to push some binary data from Python to C++ module.  std::string look like a
natural way to do it. Unfortunately I can't get this simple stuff working.
After several invokes, TestStr() raise the "RuntimeError: unidentifiable C++
exception" which I think is actually a crush (access violation or so). Here
is the snippets from my code:

-Py-----------------------
import dx8
for i in range( 40 ):
    dx8.TestStr( "a"*96 )

-C++-----------------------
void        TestStr( std::string s )
{
        char buf[ 512 ];
        ::memcpy( buf, s.data(), 96 );
 }

BOOST_PYTHON_MODULE(dx8cpp)
{
        def( "TestStr", &TestStr );
}
---------------

The looping in this example is essential. Say, after 4 iteration function
still work, but 40 iterations kills for shure.  If I replace std::string to
const char* , like:

void        TestStr( const char* s )
{
        char buf[ 512 ];
        ::memcpy( buf, s, 96 );
}

then problem disappears.  Any suggestions are welcomed.
My system is Win2000 + Python 2.3 + VS.NET (VC 7.0) + Boost 1.31.0

    Vladimir Ignatov