def getArticles(self, who, RollTimes=None):
        '''
        打开某个聊天框
        who : 要打开的聊天框好友名，str;  * 最好完整匹配，不完全匹配只会选取搜索框第一个
        RollTimes : 默认向下滚动多少次，再进行搜索
        '''
        self.UiaAPI.SwitchToThisWindow()
        RollTimes = 10 if not RollTimes else RollTimes
        def roll_to(who=who, RollTimes=RollTimes):
            for i in range(RollTimes):
                if who not in self.GetSessionList()[:-1]:
                    self.SessionList.WheelDown(wheelTimes=3, waitTime=0.1*i)
                else:
                    time.sleep(0.5)
                    self.SessionList.ListItemControl(Name=who).Click(simulateMove=False)
                    return 1
            return 0
        rollresult = roll_to()
        if rollresult:
            return 1
        else:
            self.Search(“订阅号”)
            return roll_to(RollTimes=1)