Read Array with winrt JsonObject using namespace Windows::Data::Json;

Question

I'm filling an array, need to read it, and then fill it into a CStringArray. How can I achieve this?

As integer and as string values.

JsonArray arrPosition;
JsonArray arrIndex;


if (JsonObject::TryParse(jsonstr, obj))
{

	arrPosition = obj.GetNamedArray(L"PositionArray");

	for (int i = 0; i < arrPosition.Size(); i++)
	{
		JsonValue helpJsonValue = arrPosition.GetAt(0);
	
		//CString result = tempStr.c_str();
		//			PositionArray.Append((CA2W(arrPosition[i]).m_psz));
	}

{
  "Station": "X",
  "PositionArray": [
    1,
    2
  ],
  "IndexArray": [
    1,
    2
  ],
 "GroupIndexArray": [
    "White",
    "Black"
  ],

Answer 1

Hi, @Noah Aas

Example:

	CStringArray PositionArray;
	if (obj.HasKey (L"PositionArray")) {
		JsonArray listArray = obj.GetNamedArray (L"PositionArray");
		for (auto value : listArray) {
			if (value.ValueType () == JsonValueType::Number) {
			CString str;
			#ifdef  UNICODE
				str.Format (L"%.0f", value.GetNumber ());
			#else
				str.Format ("%.0f", value.GetNumber ());
			#endif
			PositionArray.Add (str);
			}
		}
	}
	//std::wcout << L"PositionArray:" << std::endl;
	//for (int i = 0; i < PositionArray.GetSize (); ++i) {
	//	std::wcout << L"- " << PositionArray[i].GetString () << std::endl;
	//}
	CStringArray GroupIndexArray;
	if (obj.HasKey (L"GroupIndexArray")) {
		JsonArray listArray = obj.GetNamedArray (L"GroupIndexArray");
		for (auto value : listArray) {
			if (value.ValueType () == JsonValueType::String) {
				CString str (value.GetString ().c_str ());
				GroupIndexArray.Add (str);
			}
		}
	}
	//std::wcout << L"GroupIndexArray:" << std::endl;
	//for (int i = 0; i < GroupIndexArray.GetSize (); ++i) {
	//	std::wcout << L"- " << GroupIndexArray[i].GetString () << std::endl;
	//}

Best regards,

Minxin Yu

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Answer 2

JsonValue has a GetString member. Remember though that if you don't know the underlying type, the ValueType property identifies the type of the value and what GetXxx you have to call.