如何使用libkml-1.3.0解析出kml文件中的wayline信息

要使用libkml-1.3.0解析KML文件中的wayline信息，可以按照以下步骤进行：

1. 安装libkml-1.3.0库，包括头文件和库文件。

2. 在代码中包含libkml的头文件:

   #include <kml/dom.h>

3. 读取KML文件并解析:

   // 创建一个KML Document对象
   kmldom::KmlFactory* factory = kmldom::KmlFactory::GetFactory();
   kmldom::KmlPtr kml = factory->CreateKml();

   // 读取KML文件
   std::string kml_data;
   bool read_successful = kmldom::ReadFile("path/to/your/kml/file.kml", &kml_data);
   if (!read_successful) {
       std::cerr << "Failed to read KML file: path/to/your/kml/file.kml" << std::endl;
       return -1;
   }

   // 解析KML数据
   std::string errors;
   kmldom::ParseResult parse_result = kmldom::Parse(kml_data, &errors);
   if (parse_result != kmldom::PARSER_SUCCESS) {
       std::cerr << "Failed to parse KML data: " << errors << std::endl;
       return -1;
   }

   // 获取KML Document对象
   kml = parse_result.get();

   // 检查是否解析成功
   if (!kml) {
       std::cerr << "Failed to get KML document object." << std::endl;
       return -1;
   }

4. 遍历KML对象，找到wayline信息:

   kmldom::FolderPtr root_folder = std::dynamic_pointer_cast<kmldom::Folder>(kml->get_feature());
   if (!root_folder) {
       std::cerr << "Failed to get root folder." << std::endl;
       return -1;
   }

   // 遍历所有Folder对象
   for (size_t i = 0; i < root_folder->get_feature_array_size(); i++) {
       kmldom::FeaturePtr feature = root_folder->get_feature_array_at(i);
       if (!feature) {
           std::cerr << "Failed to get feature." << std::endl;
           continue;
       }

       // 判断是否为Placemark对象
       kmldom::PlacemarkPtr placemark = std::dynamic_pointer_cast<kmldom::Placemark>(feature);
       if (!placemark) {
           continue;
       }

       // 判断Placemark是否包含LineString对象
       kmldom::GeometryPtr geometry = placemark->get_geometry();
       kmldom::LineStringPtr line_string = std::dynamic_pointer_cast<kmldom::LineString>(geometry);

       if (line_string) {
           // 获取LineString的坐标
           kmldom::CoordinatesPtr coordinates = line_string->get_coordinates();
           if (coordinates) {
               std::string coord_string = coordinates->get_value();
               std::cout << "LineString coordinates: " << coord_string << std::endl;
           }
       }
   }

通过以上步骤，就可以使用libkml-1.3.0库解析出KML文件中的wayline信息。