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IOCTL_LAMP_GET_EMITTING_LIGHT IOCTL (lamp.h)

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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)

Major code

IRP_MJ_DEVICE_CONTROL

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.

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.

Requirements

Requirement Value
Header lamp.h