IOCTL_LAMP_GET_EMITTING_LIGHT IOCTL (lamp.h)
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
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 |