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subscribe时可以不请求市场数据吗 #64

@langziyang

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@langziyang

query_history前需要先订阅,而在订阅时因为要调用

 #  订阅tick数据并创建tick对象缓冲区
        self.reqid += 1
        self.client.reqMktData(self.reqid, ib_contract, "", False, False, [])

但是reqMktData需要付费,导致原本可以免费query_history的功能无法进行下去

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