CTL_CODE macro (d4drvif.h)

Article
02/22/2024

The d4drvif.h CTL_CODE macro defines IOCTLs for the DOT4 virtual printer port protocol that enables a multi-function printing device to simultaneously send and receive data packets on a single physical channel.

Syntax

void CTL_CODE(
   DeviceType,
   Function,
   Method,
   Access
);

Parameters

DeviceType

Contains the value for FILE_DEVICE_DOT4 (0x3a).

Function

Contains the IOCTL Function value (IOCTL_DOT4_USER_BASE base value of 2049 + IOCTL-specific value of 0-9).

Method

Contains the method codes for how buffers are passed for I/O and FS controls:

Method code	Value
METHOD_BUFFERED	0
METHOD_IN_DIRECT	1
METHOD_OUT_DIRECT	2
METHOD_NEITHER	3

Access

Contains the access check values:

Method code	Value
FILE_ANY_ACCESS	0x0000
FILE_READ_ACCESS	0x0001
FILE_WRITE_ACCESS	0x0002

Return value

None

Requirements

Requirement	Value
Header	d4drvif.h

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