Get shader name for face?

[Anonymous]

Hi there, I'm writing an exporter and I need to get the material name for each face. Does anyone know the simplest way to do this, i have the poly iterator like this:

    while (!iter_polys.isDone())
    {
        out_file << "f ";

        unsigned int vert_count = iter_polys.polygonVertexCount();
        for (unsigned int i = 0; i < vert_count; i++)
        {
            int uv_index;
            iter_polys.getUVIndex(i, uv_index);
            out_file << (iter_polys.vertexIndex(i) + 1) << "/" << (uv_index + 1) << "/" << (iter_polys.normalIndex(i) + 1) << " ";
        }

        out_file << "\n";

        iter_polys.next();
    }

Thanks!