IOCTL_LAMP_GET_EMITTING_LIGHT - NtDoc

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

// CTL_CODE(0x0022, 0x008, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_LAMP_GET_EMITTING_LIGHT 0x00220020
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Windows Driver Kit DDI reference (ni-lamp-ioctl_lamp_get_emitting_light)

IOCTL_LAMP_GET_EMITTING_LIGHT IOCTL

Description

The IOCTL_LAMP_GET_EMITTING_LIGHT control code queries if the lamp is turned on.

#define IOCTL_LAMP_GET_EMITTING_LIGHT \
    CTL_CODE(IOCTL_LAMP_BASE, 0x0008, METHOD_BUFFERED, FILE_ANY_ACCESS)

Parameters

Major code

Input buffer

Irp->AssociatedIrp.SystemBuffer points to a buffer of type BOOLEAN.

Input buffer length

Length of a BOOLEAN.

Output buffer

Irp->AssociatedIrp.SystemBuffer contains the lamp state; TRUE if the lamp is turned on and emitting light; FALSE otherwise.

Output buffer length

IO_STACK_LOCATION.Parameters.DeviceIoControl.OutputBufferLength is the length of the buffer in bytes passed in the Irp->AssociatedIrp.SystemBuffer field.

Input/output buffer

Input/output buffer length

Status block

The driver sets Irp->IoStatus.Status to STATUS_SUCCESS or the appropriate error status. It will set Irp->IoStatus.Information to the number of bytes required to hold a DWORD value.

If the device has been acquired by a camera driver, the lamp driver should return a STATUS_RESOURCE_IN_USE error via Irp->IoStatus.Status.

View the official Windows Driver Kit DDI reference

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