JSON解析"NULL"

我有这个代码工作到今天.如果有这样的例子:

"状态":空

将出现"无效的类类型"异常.怎么解决？感谢帮助.

procedure TForm1.Button10Click(Sender: TObject);
var
  IdHTTP: TIdHTTP;
  IdSSL: TIdSSLIOHandlerSocketOpenSSL;
  JSON: string;
  jsonObiekt: TJSONObject;
  streams: TJSONArray;
  stream: TJSONObject;
  channel: TJSONObject;
  status: TJSONString;
  liczbaStrumieni: integer;
  i: integer;
begin
  IdHTTP := TIdHTTP.Create;
  try
    IdSSL := TIdSSLIOHandlerSocketOpenSSL.Create(IdHTTP);
    IdHTTP.IOHandler := IdSSL;
    IdHTTP.Request.Accept := 'application/vnd.twitchtv.v3+json';
    IdHTTP.Request.CustomHeaders.AddValue('Client-ID', 'smb61nyd0vxmqdn9d3k735qbx41cdyg');
    JSON := IdHTTP.Get('https://api.twitch.tv/kraken/streams?game=StarCraft:%20Brood%20War');
  finally
    IdHTTP.Free;
  end;
  jsonObiekt := TJSONObject.ParseJSONValue(JSON) as TJSONObject;
  try
    streams := jsonObiekt.Get('streams').JsonValue as TJSONArray;
    liczbaStrumieni := streams.Size;
    for i := 0 to liczbaStrumieni - 1 do
    begin
      stream := streams.Get(i) as TJSONObject;
      channel := stream.Get('channel').JsonValue as TJSONObject;
      status := channel.Get('status').JsonValue as TJSONString;
      Memo6.Lines.Add(status.Value);
    end;
  finally
    jsonObiekt.Free;
  end;
end;

Mason Wheele.. 5

我从评论中看到您熟悉JSON.org上的JSON规范.您的问题似乎是了解它如何映射到DBXJSON模型.

具体而言,TJSONObject表示由JSON标准定义的Object. 它不是指"一个(德尔福)对象持有JSON数据." 那是什么TJSONValue.尝试使用它.