boost-propertytree

问题 How can I get data from JSON with array as root node by using Boost.PropertyTree? [ { "ID": "cc7c3e83-9b94-4fb2-aaa3-9da458c976f7", "Type": "VM" } ] 回答1: The array elements are just values with a key named "" for property tree: for (auto& array_element : pt) { for (auto& property : array_element.second) { std::cout << property.first << " = " << property.second.get_value<std::string>() << "\n"; } } Prints ID = cc7c3e83-9b94-4fb2-aaa3-9da458c976f7 Type = VM Live On Coliru #include <boost

问题 I'm trying to write an XML parser, parsing the XML file to a boost::property_tree and came upon this problem. How can I check (quickly) if a child of a certain property exists? Obviously I could iterate over all children using BOOST_FOREACH - however, isn't there a better solution to this? 回答1: optional< const ptree& > child = node.get_child_optional( "possibly_missing_node" ); if( !child ) { // child node is missing } 回答2: Here's a couple of other alternatives: if( node.count("possibliy

问题 My question is related to : boost Some of the boost code is working correctly to find that a node has child, but if one node have two other nodes it didn't recognize the children. It's recursive call to be able to read all the tree nodes and then apply the copy of the value to the google protocol buffer void ReadXML(iptree& tree, string doc) { const GPF* gpf= pMessage->GetGPF(); for(int i = 0 ; i < gpf->field_count(); ++i) { string fieldName = GetName(i); boost::optional< iptree & > chl = pt

问题 I have a property tree where all the data is stored in its leaf nodes. The Tree, however, has a complex structure. What I want to do now is: get all (and only the) leaf nodes of the tree, for they contain the data and recall the path leading to the respective leaf node Eventually, I want to receive a key/value pair of all (and only the) leaf nodes where the key contains the complete path to the node and the value contains the node's value. My questions are: Is there a more convenient way than

问题 I am fairly new to C++ and I apologise beforehand if you find this very easy. I have the following files POST1.h #ifndef POST1_HH #define POST1_HH #include <iostream> #include <boost/property_tree/ptree.hpp> #include <boost/property_tree/json_parser.hpp> using namespace std ; using boost::property_tree::ptree; using boost::property_tree::read_json; using boost::property_tree::write_json; using boost::property_tree::basic_ptree; #include "DBAccess2.h" class POST1 { public: string TokenNo;

问题 I'm using boost::property_tree . The documentation is very vague and overall unhelpful for the most part. Looking at the source/examples didn't help that much, either. What I'm wondering is the following: <VGHL> <StringTable> <Language>EN</Language> <DataPath>..\\Data\\Resources\\Strings\\stringtable.bst</DataPath> </StringTable> </VGHL> How can I iterate over all the elements at the current level? If I do this: read_xml(fin, bifPropTree); VGHL::String tablePath; BOOST_FOREACH(boost::property

问题 The usage scenario is industrial (unstable power supply and other buggy programs/hardware). It is required that the program should come back unaffected when power is off (or blue-screen crash). OS is Windows 7 with NTFS. I use boost::property_tree write json to record parameters to human readable text file. boost::property_tree::write_json("logic.txt", pt); It actually wiped the "logic.txt" sometimes, when system halt. I read the boost source file and write_json calls ofstream with default

问题 Before answering this question I would request all you good people here to first take a look at this output that I am getting presently. The output is fetched from a sqlite3 table SiteCode which has two columns ID and Code . Although, I go the output but i still dont see the field name in the output. i mean I need an ouput which looks like the following (name-value pair) {"ID":"7","Code":"786","ID":"8","Code":"78","ID":"9","Code":"785","ID":"10","Code":"998","ID":"11","Code":"656"} So do I

问题 I have a piece of code that iterates over a boost property tree (XML). I need a ptree of the current node, not the children of the node. UPDATE xml tree <node id="A.html"> <subnode> child A1 </subnode> <subnode> child A2 </subnode> </node> <node id="B.html"> <subnode> child B1 </subnode> <subnode> child B2 </subnode> </node> itteration code void parse_tree(ptree& pt, std::string key) { string nkey; if (!key.empty()) nkey = key + "."; ptree::const_iterator end = pt.end(); for(ptree::iterator

问题 I need to parse a large XML file using property tree in boost libraries. How to use them ONLY instead of including the whole boost libraries? 回答1: There's no need for you whatsoever to include the whole boost libraries. For example, if you look in the quick tutorial in the appropriate boost documentation page for XML Property Trees, you see that you only need to include the following: #include <boost/property_tree/ptree.hpp> #include <boost/property_tree/xml_parser.hpp> In order to get the