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Hi,
I suggest you to take a look to the way it is done in tool_topics:ShapeShifter
http://docs.ros.org/diamondback/api/topic_tools/html/shape__shifter_8h_source.html
I expect the function you want to write to look like this
void copyToString(ros::serialization::OStream& stream, std::string& output)
{
output.resize( stream.getLength() );
memcpy(stream.getData(), &output[0], stream.getLength());
}