[UE4] parse JSON string

API

Reader：
TSharedRef< TJsonReader<> > Reader = TJsonReaderFactory<>::Create(JsonStr);
rRoot:
TSharedPtr rRoot;

String parsing interface
bool bSuccess = FJsonSerializer::Deserialize(Reader, rRoot)

if(bSuccess)
{
    
	int32 value;
	// Through this interface   Get the corresponding key int32 int64 double  value 
	rRoot->TryGetNumberField(TEXT("key"), value)
	// The interface returns  double  Type value 
	double value =  FJsonObject::GetNumberField("key")

	// If key The corresponding is   One  TArray 
	const TArray<TSharedPtr<FJsonValue>>* list;
	rRoot->TryGetArrayField(TEXT("key"), list)
	// And then according to  list  The actual situation of the neutron term is being analyzed 
	(*list)[0]->AsObject() // Turn into  FJsonObject
	(*list)[0]->AsArray() // Turn into  TArray

	// If key The corresponding is   One  Json
	const TSharedPtr<FJsonObject>*& jsonObject
	rRoot->TryGetObjectField(TEXT("key"), jsonObject)
}