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Thanks lorenz,

I tried it like:

    BOOST_FOREACH(rosbag::MessageInstance const m, view_all){
bag_write.write(m.getTopic(),m);

But it doesn't work as this kind of write is just possible with a ros::MessageEvent and not rosbag::MessageInstance

void    write (std::string const &topic, ros::Time const &time, boost::shared_ptr< T > const &msg, boost::shared_ptr< ros::M_string > connection_header=boost::shared_ptr< ros::M_string >())

void    write (std::string const &topic, ros::Time const &time, boost::shared_ptr< T const > const &msg, boost::shared_ptr< ros::M_string > connection_header=boost::shared_ptr< ros::M_string >())

void    write (std::string const &topic, ros::Time const &time, T const &msg, boost::shared_ptr< ros::M_string > connection_header=boost::shared_ptr< ros::M_string >())

void    write (std::string const &topic, ros::MessageEvent< T > const &event)