有没有人分享下自动订阅主力合约的代码？或者订阅所有合约的代码
找主力可参考https://www.vnpy.com/forum/topic/4725-zhao-dao-qi-huo-zhu-li-he-yue-bing-qie-an-jiao-yi-e-jiang-xu-pai-lie 订阅全市场合约可参考https://www.vnpy.com/forum/topic/4537-xing-qing-ji-lu-guo-cheng-zhong-mainenginedu-zuo-liao-shi-yao-xing-qing-ji-lu-mo-kuai-yuan-ma-bu-fen-fen-xi
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