difference between Read/Write Operation and IOCTL operation

NTDEV
1

friends,

can anbody tell me clearly how we can use ReadFile and DeviceIOControl
appropriately. and what is the brief differnece between them??

thanx,

shiv

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2

The difference depends on particular driver :slight_smile:
ReadFile is generic read semantics - no input data, only output.
IOCTL is able of bi-directional flow - both input and output.

As about the difference between output-only IOCTL and read - it depends mainly on driver developer tastes :-), though there are lots
of IOCTLs which are mandatory to all devices of a given class.

Max

----- Original Message -----
From: “Shiva Prasad. T. S.”
To: “NT Developers Interest List”
Sent: Thursday, December 27, 2001 5:33 AM
Subject: [ntdev] difference between Read/Write Operation and IOCTL operation

> friends,
>
> can anbody tell me clearly how we can use ReadFile and DeviceIOControl
> appropriately. and what is the brief differnece between them??
>
> thanx,
>
> shiv
>
> —
> You are currently subscribed to ntdev as: xxxxx@storagecraft.com
> To unsubscribe send a blank email to leave-ntdev-$subst(‘Recip.MemberIDChar’)@lists.osr.com
>

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