IOCTL_KEYBOARD_QUERY_INDICATOR_TRANSLATION IOCTL

The IOCTL_KEYBOARD_QUERY_INDICATOR_TRANSLATION request returns information about the mapping between scan codes and indicators.

Kbdclass copies the current stack location, sets the MajorFunction member of the new stack location to IRP_MJ_INTERNAL_DEVICE_CONTROL, and sends this request down the device stack.

Major Code

IRP_MJ_DEVICE_CONTROL

Input Buffer

The Parameters.DeviceIoControl.InputBufferLength member is set to zero or a value greater than or equal to the size, in bytes, of a KEYBOARD_UNIT_ID_PARAMETER. A value of zero specifies a default unit ID of zero.

The AssociatedIrp.SystemBuffer member points to a client-allocated buffer that is used to input and output information. On input, AssociatedIrp.SystemBuffer points to a KEYBOARD_UNIT_ID_PARAMETER structure. The client sets the UnitId member of the input structure.

The Parameters.DeviceIoControl.OutputBufferLength member specifies the size, in bytes, of a client-allocated output buffer, which must be greater than or equal to the size, in bytes, of a KEYBOARD_INDICATOR_TRANSLATION structure. (Note that this structure contains a device-specific array of members that map indicators to scan codes.)

Input Buffer Length

A value greater than or equal to the size of a KEYBOARD_INDICATOR_TRANSLATION structure.

Output Buffer

AssociatedIrp.SystemBuffer points to a client-allocated buffer that the lower-level drivers use to output a KEYBOARD_INDICATOR_TRANSLATION structure.

Output Buffer Length

The size of a KEYBOARD_INDICATOR_TRANSLATION structure.

Input / Output Buffer

Input / Output Buffer Length

Status Block

If the request is successful, the Information member is set to the number of bytes of translation data in the KEYBOARD_INDICATOR_TRANSLATION structure.

The Status member is set to one of the following values:

Requirements

   
Header ntddkbd.h (include Ntddkbd.h)

See Also

IOCTL_KEYBOARD_QUERY_ATTRIBUTES

IOCTL_KEYBOARD_QUERY_INDICATORS

IOCTL_KEYBOARD_QUERY_TYPEMATIC

IOCTL_KEYBOARD_SET_INDICATORS

IOCTL_KEYBOARD_SET_TYPEMATIC

KEYBOARD_INDICATOR_TRANSLATION

KEYBOARD_UNIT_ID_PARAMETER