🚀 go-pugleaf

I would like to detect when USB devices are added or removed. 

Such operations are accompanied by following message : 
WM_DEVICECHANGE : DBT_DEVNODES_CHANGED 

However, the DBT_DEVNODES_CHANGED is sent multiple times whenever a
device change occurs (e.g. when I removed a device I got 2
DBT_DEVNODES_CHANGED, when I re-attached the device I got 4
DBT_DEVNODES_CHANGED). Obviously, I only want to perform one device
scan instead of scanning x times depending on the number of
DBT_DEVNODES_CHANGED messages received). 

Any ideas on how to accomplish this ? Should I just wait a little bit
longer, e.g. treat all DBT_DEVNODES_CHANGED in a 2 second time-span as
one DBT_DEVNODES_CHANGED message that will then trigger a new device
scan ? 

I was also looking at using DBT_DEVICEARRIVAL and
DBT_DEVICEREMOVECOMPLETE. Unfortunately, these events are also sent
when I remove or insert a CD in the drive. So, solely relying on these
events would again result in performing a new device scan too
frequently. 

These are the messages I see appearing : 

Connect device : 
DBT_DEVNODES_CHANGED 
DBT_DEVNODES_CHANGED 
DBT_DEVICEREMOVECOMPLETE 

Remove device : 
DBT_DEVNODES_CHANGED 
DBT_DEVNODES_CHANGED 
DBT_DEVNODES_CHANGED 
DBT_DEVICEARRIVAL 
DBT_DEVNODES_CHANGED 

Insert CD :
DBT_DEVICEARRIVAL 

Remove CD :
DBT_DEVICEREMOVECOMPLETE 


Any ideas on what is the most efficient way of detecting the
adding/removing of devices without ending up doing too many calls to
the function that will (re)enumerate the device list.

Thanks.