A SetWmiDataItem callback handles the setting of one data item in an instance. This routine is not called in Wdm3. Listing 12.8 shows how SetWmiDataItem calls FailWMIRequest to reject the WMI IRP. FailWMIRequest fails the IRP with STATUS_WMI_GUID_NOT_FOUND if an invalid GUID was given, or STATUS_INVALID_DEVICE_REQUEST otherwise.

Listing 12.8 SetWmiDataItem routine

NTSTATUS SetWmiDataItem(IN PDEVICE_OBJECT fdo, IN PIRP Irp, IN ULONG GuidIndex, IN ULONG InstanceIndex, IN ULONG DataltemId, IN ULONG BufferSize, IN PUCHAR PBuffer) {

 DebugPrint("SetWmiDataItem: GuidIndex %d, InstanceIndex %d, DataItemId %d, BufferSize %d",

  GuidIndex.InstanceIndex, DataItemId, BufferSize);

 return FailWMIRequest(fdo, Irp, GuidIndex);

}

NTSTATUS FailWMIRequest(IN PDEVICE_OBJECT fdo, IN PIRP Irp, IN ULONG GuidIndex) {

 DebugPrint("FailWMIRequest: GuidIndex %d",GuidIndex);

 NTSTATUS status;

 if (GuidIndex<0 || GuidIndex>=GUID_COUNT) status = STATUS_WMI_GUID_NOT_FOUND;

 else status = STATUS_INVALID_DEVICE_REQUEST;

 status = WmiCompleteRequest(fdo, Irp, status, 0, IO_NO_INCREMENT);

 return status;

}