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I used this to add topics of a certain type to a GUI selector:

ros::master::V_TopicInfo ti;
if(ros::master::getTopics(ti)) {
    for(ros::master::V_TopicInfo::iterator it = ti.begin(); it != ti.end(); it++) {
        if(it->datatype == _topicType)
            ui.topicsList->addItem(it->name.c_str());
    }
}

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