使用 Poco 迭代 json 结构

Question

我正在为 C++ 代码使用 Poco 库

这是我必须解析的 json 树的示例

{
    "name" : "actionToDo",
    "description" : "",
    "version" : "1",
    "parameters" : {
        "inputDirectory" : "string",
        "workingDir" : "string",
        "tempDir" : "string",
        "size" : "integer"
    }
}

"parameters" 字段中的数据量可以更改。我必须将所有项目放入地图

这是我今天的代码

std:: map<std::string, std::string> output;

Poco::JSON::Parser sparser;
Poco::Dynamic::Var result = sparser.parse(jsonStr);
Poco::JSON::Object::Ptr object = result.extract<Poco::JSON::Object::Ptr>();
Poco::DynamicStruct ds = *object;

Poco::Dynamic::Var collection(ds["parameters"]);

if (collection.isStruct())
{
     LOG("STRUCT"); //it's logged !!
}

for (Poco::Dynamic::VarIterator it = collection.begin(); it != collection.end(); ++it)
{
    LOG_F("item : %s", it->toString()); //never logged
    //here I would like to have something like
    //output[it->first()] = it->second();

}

我得到的输出

14:13:00'900 : : [Notice] : STRUCT

14:13:00'900 : : [Critical] : Exception : Exception: Unable to load Run from file : /opt/.../file.json Exception: Unable to parse field 'parameters' or its children

Invalid access: Not a struct.

"Unable to parse field 'parameters' or its children" 由下面的捕获生成，但 "Invalid access: Not a struct." 来自 Poco

Answer 1

用于集合变量DynamicStruct而不是Var

Poco::DynamicStruct collection = ds["parameters"].extract<Poco::DynamicStruct>();

for (auto it = collection.begin(); it != collection.end(); ++it)
{
    LOG_F("item : %s", it->second.toString().c_str());
}

使用 Poco 迭代 json 结构

Iterate on json structure with Poco

c++

json

dynamic

poco-libraries