百度网盘单次转存有文件数量限制，一旦超过某个数值，就会提示转存失败。其中，单次转存3000的意思是，一次性转存文件的数量，不能超过3000个。
I made a private API that assumes that the address of the first member-object in the class will be the same as the class\'s this-pointer... that way the member-object can trivially derive a pointer to
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