请教这一段话的具体含义

就是Q:下面的那段话，If it does,......这段话究竟什么含义？

Comments
IoCallDriver assigns the DeviceObject input parameter to the device object
field of the IRP stack location for the next lower driver.

An IRP passed in a call to IoCallDriver becomes inaccessible to the higher-level driver, unless
the higher-level driver has set up its
IoCompletion routine for the IRP with IoSetCompletionRoutine.

Q:
If it does, the IRP input to the driver-supplied IoCompletion routine has
its I/O status block set by the lower driver(s) and all lower-level
driver(s)\' I/O stack locations filled with zeros.

大体是这么个意思了。。。。就是说。。。

“如果你调用了IoCallDriver函数，，并且设置了完成例程。。

那么这个IRP被传到设置的完成例程的时候，，它的IO状态块的值。。

已经有它下一层的驱动设置了。。。。而此时。。所有的更底层的

驱动对应的IO堆栈的内容为0（也就是没有任何参数了。。）”



俺外语翻译水平的不好，，，给你简单的顺了顺，，自己在看看哦。。。