DeviceIoControl requires more parameters than ioctl does.

deviceiocontrol比ioctl需要更多的参数。

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Unlike the corresponding system call DeviceIOControl, the input parameter list in ioctl is not fixed.

与对应的系统调用DeviceIOControl不同，ioctl的输入参数列表并不固定。

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If the pointer for an overlapped operation is set to NULL, DeviceIoControl will work in a blocked (synchronous) way.

如果重叠操作的指针设为NULL，那么DeviceIoControl将以阻塞(同步)方式工作。

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