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请问Chr$(-56)字符是什么意思

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用宏录制了一个操作,编辑查看时,其中有一行命令为:

CadInputQueue.SendKeyin "task sendtaskchangedasync ""\Building Designer " + Chr$(-56) + Chr$(-50) + Chr$(-50) + Chr$(-15) + Chr$(-64) + Chr$(-72) + "\" + Chr$(-51) + Chr$(-68) + Chr$(-42) + Chr$(-67) + Chr$(-41) + Chr$(-23) + Chr$(-42) + Chr$(-81) + """"

请问这里面出现的Chr$(-56)等字符是表示什么意思?如果是ASCII码值,为什么会出现负值?这句应该怎么解析?


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