这个跟参数多少没有关系，这个是pyqt的问题，最好出一个不需要ui交易的版本，
qt实在是呵呵哒

大部分情况是TWS API的问题，你要看log信息，才知道怎么改

最后发现还是req的问题：

self.client.reqHistoricalData(
            self.reqid,
            ib_contract,
            '',# end_str, workaround
            duration,
            bar_size,
            bar_type,
            0,
            1,
            False,
            []
        )

endDateTime, The request's end date and time (the empty string indicates current present moment).

买好包 wrote:

继续请教一下，ib的连续合约MHI，HSI是否只支持半年内的数据下载？怎么找更长时间的呢？

ibkr理论上最大只有180天，你看源码里面有注释

def query_history(self, req: HistoryRequest) -> List[BarData]:
        """查询历史数据"""
        self.history_req = req

        self.reqid += 1

        ib_contract: Contract = generate_ib_contract(req.symbol, req.exchange)

        if req.end:
            end: datetime = req.end
            end_str: str = end.strftime("%Y%m%d %H:%M:%S")
        else:
            end: datetime = datetime.now(self.local_tz)
            end_str: str = ""

        delta: timedelta = end - req.start
        days: int = min(delta.days, 180)     # IB 只提供6个月数据

Exception in thread Thread-15 (run):
Traceback (most recent call last):
  File "/opt/homebrew/Caskroom/miniforge/base/envs/py310/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
    self.run()
  File "/opt/homebrew/Caskroom/miniforge/base/envs/py310/lib/python3.10/threading.py", line 953, in run
    self._target(*self._args, **self._kwargs)
  File "/opt/homebrew/Caskroom/miniforge/base/envs/py310/lib/python3.10/site-packages/ibapi/client.py", line 263, in run
    self.decoder.interpret(fields)
  File "/opt/homebrew/Caskroom/miniforge/base/envs/py310/lib/python3.10/site-packages/ibapi/decoder.py", line 1296, in interpret
    handleInfo.processMeth(self, iter(fields))
  File "/opt/homebrew/Caskroom/miniforge/base/envs/py310/lib/python3.10/site-packages/ibapi/decoder.py", line 519, in processHistoricalDataMsg
    self.wrapper.historicalData(reqId, bar)
  File "/opt/homebrew/Caskroom/miniforge/base/envs/py310/lib/python3.10/site-packages/vnpy_ib/ib_gateway.py", line 619, in historicalData
    symbol=self.history_req.symbol,
AttributeError: 'NoneType' object has no attribute 'symbol'