METHOD_IN_DIRECT

NTDEV
1

Hello.
Can I use METHOD_IN_DIRECT and METHOD_OUT_DIRECT together. When I want to send and receive buffer from driver.
like this
#define MY_IOCTL CTL_CODE(FILE_DEVICE_NETWORK, 0x800, METHOD_IN_DIRECT | METHOD_OUT_DIRECT, FILE_ANY_ACCESS)
The CTL_CODE macro defines 2 bits for this, so I think we can’t assign both methods. Then, how to send and receive buffers to and from the driver using a single IRP.

2

If it is writable it is readable.

3

No, you can’t use them together. Those are not bits, they are enumerations. In fact, that particular combination would be very bad, because METHOD_IN_DIRECT (1) ored with METHOD_OUT_DIRECT (2) gives you 3, which is METHOD_NEITHER. And nobody wants that.

However, for all practical purposes, the two are identical.

4

Thanks everyone