Question

我有一个看起来像JSON的

  "results": [
    {
      "plate": "FRJ7248",
      "confidence": 94.583724975586,
      "matches_template": 1,
      "plate_index": 0,
      "region": "us-ny",
      "region_confidence": 88,
      "processing_time_ms": 94.328330993652,
      "requested_topn": 25,
      "coordinates": [
        {
          "x": 1545,
          "y": 233
        },
        {
          "x": 1640,
          "y": 241
        },
...
...

我想知道如何解析coordinates数组，我尝试了以下操作：

BOOST_FOREACH(boost::property_tree::ptree::value_type& v, pt.get_child("results")) {
    ptree subtree1 = v.second.get<string>;
    BOOST_FOREACH(boost::property_tree::ptree::value_type& w, subtree1) {
        LOG_NS_INFO << "OpenALPR     X  " << w.second.get<string>("x");
        LOG_NS_INFO << "OpenALPR     Y  " << w.second.get<string>("y");
    }
}

但是得到了

error: conversion from ‘<unresolved overloaded function type>’ to non-scalar type ‘boost::property_tree::ptree {aka boost::property_tree::basic_ptree<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> >}’ requested
             ptree subtree1 = v.second.get<string>;

我该如何解决？

Answer 1

该消息显示"conversion from ‘<unresolved overloaded function type>’"，因为您没有打电话 get。

但是您不应该使用get，应该执行与"results"相同的操作：

ptree subtree1 = v.second.get_child("coordinates");

如何解析嵌套数组？

1 个答案: