先放资料：
How to use boost::property_tree to load and write JSON
How to iterate a boost property tree?
不出现key的方法遍历一个json文件：
详细代码
1 /* ***********************************************
2 Author :111qqz
3 mail: renkuanze@sensetime.com
4 Created Time :2018年08月17日 星期五 15时29分23秒
5 File Name :ptree.cpp
6 ************************************************ */
7 #include <boost/property_tree/ptree.hpp>
8 #include <boost/property_tree/json_parser.hpp>
9 #include <bits/stdc++.h>
10 #include <vector>
11 using namespace std;
12 using boost::property_tree::ptree;
13
14 string indent(int level) {
15 string s;
16 for (int i=0; i<level; i++) s += " ";
17 return s;
18 }
19
20 void printTree (ptree &pt, int level) {
21 if (pt.empty()) {
22 cerr << "\""<< pt.data()<< "\"";
23 }
24
25 else {
26 if (level) cerr << endl;
27
28 cerr << indent(level) << "{" << endl;
29
30 for (ptree::iterator pos = pt.begin(); pos != pt.end();) {
31 cerr << indent(level+1) << "\"" << pos->first << "\": ";
32
33 printTree(pos->second, level + 1);
34 ++pos;
35 if (pos != pt.end()) {
36 cerr << ",";
37 }
38 cerr << endl;
39 }
40
41 cerr << indent(level) << " }";
42 }
43
44 return;
45 }
46 int main()
47 {
48 ptree root;
49 read_json("terr.json",root);
50 printTree(root,0);
51
52
53 return 0;
54
55 }