json - 使用 Boost 从 JSON 遍历对象数组

Question

我无法自己解决这个问题，也没有找到类似的问题。我有这个 JSON:

{
"world": {
    "soil": {
        "dimensions": {
            "depth": "200",
            "length": "200",
            "width": "200",
            "cellSize": "1"
        },
        "moisture": {
            "min": "0",
            "max": "100",
            "initialPatches": "30",
            "initialPatchesMaxWidth": "100",
            "initialPatchesSigma": "3",
            "initialPatchesUseRandom": "true"
        },
        "nutrients": {
            "minC": "0",
            "maxC": "23",
            "minN": "0",
            "maxN": "23",
            "minP": "0",
            "maxP": "23"
        },
        "temperature": "25"
    },
    "life": {
        "fungi": [
            {
                "name": "fungus gungus",
                "sporeMass": "0.02"
            },
            {
                "name": "fungus gungusim",
                "sporeMass": "0.04"
            }
        ],
        "fungivores": {
        },
        "predators": {
        }
    }
}
}

我在尝试恢复两种不同真菌物种的信息时陷入停滞。我能够提取简单的参数，如深度、初始补丁等...但完全迷失了如何遍历所有真菌物种...有任何提示吗？

提前致谢，

何塞

Answer 1

如果你用谷歌搜索，你可以找到几个结果:

1. property_tree
2. JSON parser使用上面的
3. example使用 JSON 解析器

更新

试试这个:

BOOST_FOREACH(const ptree::value_type& child, node.get_child("life.fungi")) {
    std::cout
        << child.second.get<std::string>("sporeMass")
        << "\n";
}