deviceiocontrol
deviceiocontrol-
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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DeviceIoControl requires more parameters than ioctl does .
DeviceIoControl比ioctl需要更多的参数。
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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。