IOCTL_KEYBOARD_QUERY_TYPEMATIC IOCTL

The IOCTL_KEYBOARD_QUERY_TYPEMATIC request returns the typematic settings.

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.

Input Buffer Length

The size of a KEYBOARD_UNIT_ID_PARAMETER structure.

Output Buffer

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

Output Buffer Length

The size of a KEYBOARD_TYPEMATIC_PARAMETERS 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 a KEYBOARD_TYPEMATIC_PARAMETERS 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_INDICATOR_TRANSLATION

IOCTL_KEYBOARD_SET_INDICATORS

IOCTL_KEYBOARD_SET_TYPEMATIC

KEYBOARD_TYPEMATIC_PARAMETERS

KEYBOARD_UNIT_ID_PARAMETER