The return value is the address of whatever device object is immediately underneath yours, which can be the PDO or the address of some lower filter device object.
返回值是任何在你的设备之下紧挨着的设备对象的地址，这个设备对象可以是P DO或者一些较低过滤设备对象的地址。
The return value is the address of whatever device object is immediately underneath yours, which can be the PDO or the address of some lower filter device object.
返回值是任何在你的设备之下紧挨着的设备对象的地址，这个设备对象可以是P DO或者一些较低过滤设备对象的地址。
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