CTL_CODE - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// d4drvif.h

void CTL_CODE(
  DeviceType,
  Function,
  Method,
  Access
);
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (nf-d4drvif-ctl_code)

CTL_CODE macro

Description

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.

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

Remarks

See also

View the official Windows Driver Kit DDI reference

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