C++ 技术

rapidxml的使用方式

Posted by Roy Zhang on 2019-08-01

RapidXml is an attempt to create the fastest XML parser possible, while retaining useability, portability and reasonable W3C compatibility. It is an in-situ parser written in modern C++, with parsing speed approaching that of strlen function executed on the same data.

RapidXml has been around since 2006, and is being used by lots of people. HTC uses it in some of its mobile phones.

If you are looking for a stable and fast parser, look no further. Integration with your project will be trivial, because entire library is contained in a single header file, and requires no building or configuration.

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void RouteNode::route2xml(Route route)
{
    xml_document<> doc;
    xml_node<> *rot = doc.allocate_node(rapidxml::node_pi, doc.allocate_string("xml version='1.0' encoding='utf-8'"));
    doc.append_node(rot);

    xml_node<> *node = doc.allocate_node(node_element, "route", "imformation");
    node->append_attribute(doc.allocate_attribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance"));
    node->append_attribute(doc.allocate_attribute("xmlns", "http://www.cirm.org/RTZ/1/1"));
    node->append_attribute(doc.allocate_attribute("version", "1.1"));
    node->append_attribute(doc.allocate_attribute("xmlns:stm", "http://stmvalidation.eu/STM/1/0/0"));
    node->append_attribute(doc.allocate_attribute("xsi:schemaLocation", "http://stmvalidation.eu/STM/1/0/0 stm_extensions.xsd"));
    doc.append_node(node);
    /***route info**/
    xml_node<> *routeInfo = doc.allocate_node(node_element, "routeInfo", NULL);
    routeInfo->append_attribute(doc.allocate_attribute("routeName", "Example_routes"));
    // routeInfo->append_attribute(doc.allocate_attribute("vesselVoyage", "  "));
    // routeInfo->append_attribute(doc.allocate_attribute("routeStatus", " "));
    node->append_node(routeInfo);
    /**extensions**/
    // xml_node<> *extensions = doc.allocate_node(node_element, "extensions", "imformation");
    // routeInfo->append_node(extensions);
    // xml_node<> *extension = doc.allocate_node(node_element, "extension", NULL);
    // extension->append_attribute(doc.allocate_attribute("name", "routeInfoEx"));
    // extension->append_attribute(doc.allocate_attribute("xsi:type", "stm:RouteInfoExtension"));
    // extension->append_attribute(doc.allocate_attribute("routeStatusEnum", "1"));
    // extension->append_attribute(doc.allocate_attribute("manufacturer", "STM"));
    // extension->append_attribute(doc.allocate_attribute("version", "1.0.0"));
    // extensions->append_node(extension);
    /********/

    /***waypoints***/
    xml_node<> *waypoints = doc.allocate_node(node_element, "waypoints", "imformation");
    node->append_node(waypoints);
    /***waypoint***/

    for (int i = 0; i < route.m_waypoints.size(); i++)
    {
        std::string id = std::to_string(route.m_waypoints[i].m_id);
        char *idc = doc.allocate_string(id.c_str());

        std::string radius = std::to_string(route.m_waypoints[i].m_radius);
        char *radiusc = doc.allocate_string(radius.c_str());
        std::string latitude = std::to_string(route.m_waypoints[i].m_latitude);
        char *latitudec = doc.allocate_string(latitude.c_str());
        std::string longitude = std::to_string(route.m_waypoints[i].m_longitude);
        char *longitudec = doc.allocate_string(longitude.c_str());

        xml_node<> *waypoint = doc.allocate_node(node_element, "waypoint", "imformation");
        waypoint->append_attribute(doc.allocate_attribute("id", idc));
        waypoint->append_attribute(doc.allocate_attribute("radius", radiusc));
        waypoints->append_node(waypoint);

        xml_node<> *position = doc.allocate_node(node_element, "position", NULL);
        position->append_attribute(doc.allocate_attribute("lat", latitudec));
        position->append_attribute(doc.allocate_attribute("lon", longitudec));

        xml_node<> *leg = doc.allocate_node(node_element, "leg", NULL);
        leg->append_attribute(doc.allocate_attribute("starboardXTD", "0.026998"));
        leg->append_attribute(doc.allocate_attribute("portsideXTD", "0.026998"));
        leg->append_attribute(doc.allocate_attribute("geometryType", "Loxodrome"));
        waypoint->append_node(position);
        waypoint->append_node(leg);
    }
    xml_node<> *schedules = doc.allocate_node(node_element, "schedules", "imformation");
    node->append_node(schedules);
    xml_node<> *schedule = doc.allocate_node(node_element, "schedule", "imformation");
    schedule->append_attribute(doc.allocate_attribute("id", "1"));
    schedules->append_node(schedule);
    xml_node<> *manual = doc.allocate_node(node_element, "manual", "imformation");
    schedule->append_node(manual);
    for (int i = 0; i < route.m_waypoints.size(); i++)
    {
        if (i != route.m_waypoints.size() - 1)
        {
            std::string id = std::to_string(route.m_waypoints[i].m_id);
            char *idc = doc.allocate_string(id.c_str());

            std::string speed = std::to_string(route.m_waypoints[i].m_speed);
            char *speedc = doc.allocate_string(speed.c_str());

            xml_node<> *scheduleElement = doc.allocate_node(node_element, "scheduleElement", NULL);
            scheduleElement->append_attribute(doc.allocate_attribute("waypointId", idc));
            scheduleElement->append_attribute(doc.allocate_attribute("speed", speedc));
            manual->append_node(scheduleElement);
        }
        else
        {
            std::string id = std::to_string(route.m_waypoints[i].m_id);
            char *idc = doc.allocate_string(id.c_str());

            std::string speed = std::to_string(route.m_waypoints[i].m_speed);
            char *speedc = doc.allocate_string(speed.c_str());

            xml_node<> *scheduleElement = doc.allocate_node(node_element, "scheduleElement", NULL);
            scheduleElement->append_attribute(doc.allocate_attribute("waypointId", idc));
            scheduleElement->append_attribute(doc.allocate_attribute("eta", "2019-06-17T12:28:24+02:00"));
            scheduleElement->append_attribute(doc.allocate_attribute("speed", speedc));
            manual->append_node(scheduleElement);
        }
    }
    xml_node<> *calculated = doc.allocate_node(node_element, "calculated", "imformation");
    schedule->append_node(calculated);
    for (int i = 0; i < route.m_waypoints.size(); i++)
    {
        if (i == 0)
        {
            std::string id = std::to_string(route.m_waypoints[i].m_id);
            char *idc = doc.allocate_string(id.c_str());

            std::string speed = std::to_string(route.m_waypoints[i].m_speed);
            char *speedc = doc.allocate_string(speed.c_str());

            xml_node<> *scheduleElement = doc.allocate_node(node_element, "scheduleElement", NULL);
            scheduleElement->append_attribute(doc.allocate_attribute("waypointId", idc));
            scheduleElement->append_attribute(doc.allocate_attribute("etd", "2019-06-17T12:22:31+02:00"));
            scheduleElement->append_attribute(doc.allocate_attribute("speed", speedc));
            calculated->append_node(scheduleElement);
        }
        else if (i == route.m_waypoints.size() - 1)
        {
            std::string id = std::to_string(route.m_waypoints[i].m_id);
            char *idc = doc.allocate_string(id.c_str());

            std::string speed = std::to_string(route.m_waypoints[i].m_speed);
            char *speedc = doc.allocate_string(speed.c_str());

            xml_node<> *scheduleElement = doc.allocate_node(node_element, "scheduleElement", NULL);
            scheduleElement->append_attribute(doc.allocate_attribute("waypointId", idc));
            scheduleElement->append_attribute(doc.allocate_attribute("eta", "2019-06-17T12:28:24+02:00"));
            scheduleElement->append_attribute(doc.allocate_attribute("speed", speedc));
            calculated->append_node(scheduleElement);
        }
        else
        {
            std::string id = std::to_string(route.m_waypoints[i].m_id);
            char *idc = doc.allocate_string(id.c_str());

            std::string speed = std::to_string(route.m_waypoints[i].m_speed);
            char *speedc = doc.allocate_string(speed.c_str());

            xml_node<> *scheduleElement = doc.allocate_node(node_element, "scheduleElement", NULL);
            scheduleElement->append_attribute(doc.allocate_attribute("waypointId", idc));
            scheduleElement->append_attribute(doc.allocate_attribute("speed", speedc));
            calculated->append_node(scheduleElement);
        }
    }
    /**extensions_end**/
    // xml_node<> *extensions_end = doc.allocate_node(node_element, "extensions", "imformation");
    // node->append_node(extensions_end);
    // xml_node<> *extension_end = doc.allocate_node(node_element, "extensions", NULL);
    // extensions_end->append_node(extension_end);
    // extension_end->append_attribute(doc.allocate_attribute("manufacturer", "transas"));
    // extension_end->append_attribute(doc.allocate_attribute("version", "1.0"));
    // extension_end->append_attribute(doc.allocate_attribute("name", "product_info"));
    // extension_end->append_attribute(doc.allocate_attribute("direction", "Wärtsilä iSailor"));
    // extension_end->append_attribute(doc.allocate_attribute("solution_version", "1.11.0 (9169)"));
    /**extention_end**/
    
    std::string text;
    rapidxml::print(std::back_inserter(text), doc, 0);

    std::cout << text << std::endl;

    std::ofstream out("config11.xml");
    out << doc;
}
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