否则,get_optional() 的工作方式与 get() 相同。 看起来 put_child() 和 add_child() 与 put() 相同。不同之处在于 put() 只创建一个键/值对,而 put_child() 和 add_child() 插入整个子树。请注意,类型为 boost::property_tree::ptree 的对象作为第二个参数传递给 put_child() 和 add_child()...
boost::property_tree::read_xml(PLSimLocale::WStringToString(m_resourceFilePath.m_ResourceStoreXMLPath), read_pt, boost::property_tree::xml_parser::trim_whitespace, utf8Locale);//没有xml,直接将第一个xml复制过来if(!read_pt.get_child_optional(L"Config")) { copy_pt= copy_pt.get_child(L...
if(auto firstChild = m_pt.get_child_optional(L"Config")) { m_pt4= m_pt.get_child(L"Config"); m_pt.clear();for(map<wstring, map<wstring, HistoryData>>::iterator it = vect_str.begin(); it != vect_str.end(); it++) {//迭代vectorfor(map<wstring, HistoryData>::iterator it1...
auto item = root.get_child_optional("Root.Scenes"); 该接口返回的是一个optional,外面还要判断该节点是否存在,optional对象通过bool操作符来判断该对象是否是无效值,通过指针访问 符"*"来访问该对象的实际内容。建议用optional接口访问xml节点。 //ptree的optional接口 auto item = root.get_child_optional("Roo...
optional< const ptree& > child = node.get_child_optional( "possibly_missing_node" ); if( !child ) { // child node is missing } 原文由 RobH 发布,翻译遵循 CC BY-SA 3.0 许可协议 有用 回复 社区维基1 发布于 2022-11-02 您可以使用 count() 检查标签是否存在 typedef boost::property_...
const self_type &get_child(const path_type &path, const self_type &default_value) const; optional<self_type &> get_child_optional(const path_type &path); optional<const self_type &> get_child_optional(const path_type &path) const; ...
问C++ boost json解析器禁止“没有这样的节点”输出ENproperty_tree 是 Boost 库中的一个头文件库，...
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boost::optional<int> op = pt.get_optional<int>("conf.gui");//使⽤get_optional()获得节点，不存在则op为空 if (op){ int i = op.get();} string str1 = pt.get<string>("conf.theme", "");//使⽤get()获得节点，不存在则返回""boost::optional child_null_test = pt.get_child_op...