我正在使用nlohmann json创建并保存一些 json 值。但是当我查看文件时,我会null
在 json 之间得到值。下面是它的样子:
{
"Created": "2019-07-03T13:54:32Z",
"DataId": "BHI-201-U8",
"Data": [
{
"Name": "Andrew",
"Attended": "Yes"
},
{
"Name": "John",
"Attended": "Yes"
},
null, <-- unexpected null
{
"Name": "Ronny",
"Attended": "No"
},
null, <-- unexpected null
null, <-- unexpected null
{
"Name": "Mathew",
"Attended": "Yes"
}
],
"Type": "Person"
}
正如您在上面的 json 数据中看到的,我得到了一些意想不到的空值。以下是我如何保存它:
#include "nlohmann/json.hpp"
using nlohmann::json;
int main()
{
json outJson;
//some code
string outFile = "output.json";
for (const auto &data : trackedData->Detections())
{
//some code
outJson["Data"][data.id]["Name"] = data.name;
outJson["Data"][data.id]["Attended"] = data.status;
}
outJson["Created"] = created;
outJson["DataId"] = "BHI-201-U8";
outJson["Type"] = "Person";
std::ofstream output_file(outFile);
output_file << outJson.dump(4 , ' ', false);
output_file.close();
}
如何null
从代码中删除这些额外内容。