我有以下代码:

wcout << jvalue.serialize() << endl;

打印出整个json数据:
{
    "data": {
        "timestamp": [
            {
                "_id": "5ad93fc48084e1089cd9667b",
                "staff_id": 172,
                "staff_name": "Michael Edano",
                "time_in": "2018-04-20T01:17:56.787Z",
                "time_out": null,
                "status": ['Leave','Vacation','Absent'],
                "createdAt": "2018-04-20T01:17:56.790Z",
                "updatedAt": "2018-04-20T01:17:56.790Z",
                "__v": 0
            }
        ],
        "success": true
    }
}

有人可以给我一个例子,让我说_id字段
status[]字段(是数组)的单个数据

web::json::value::serialize()返回的数据?

谢谢。

最佳答案

您无需调用serialize即可访问json值。一旦拥有一个jsont对象的json::value,您就可以遍历它以获得json::value的内部对象和数组:

json::value jvalue; //this is your initial value

// this new value will hold the whole 'data' object:
json::value data = jvalue.at(U("data"));

// read `timestamp` array from `data` and directly read
// the item at index 0 from it:
json::value timestamp = data.at(U("timestamp")).at(0);

// from `timestamp` (first item of timestmap array`)
json::value id = timestamp.at(U("_id"));

// print `id` as string
std::wcout << id.as_string() << std::endl;

// read `status` array first item and print it as string
json::value status = timestamp.at(U("status"));
std::wcout << status.at(0).as_string() << std::endl;

您可以从上面的代码中猜出,可以将对at的调用链接在一起:
// read the `_id` value at once and print it as string
std::wcout << jvalue.at(U("data")).at(U("timestamp")).at(0).at(U("_id")).as_string() << std::endl;

一切都很好地解释了here

关于c++ - 如何使用cpprestsdk/casablanca提取从web::json::value::serialize()返回的特定数据,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/49933541/

10-11 23:03
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