[vbox-dev] com and snapshot save / restore

Klaus Espenlaub klaus.espenlaub at oracle.com
Fri Nov 9 04:28:57 PST 2012

On 08.11.2012 16:55, Jaikumar G wrote:
> Folks,
>     So I am using the SDK Apis to save and restore a snapshot.
> a) If the same thread saves and restores the snapshot, I see that I need
> a 20 sec delay between the save and restore (presumably for vbox to
> update its data).

The most delay should come from saving the state of the VM (assuming 
it's running) as part of creating a snapshot, otherwise the snapshot 
operations should be relatively cheap. Saving the state is essentially 
linear with the RAM size of the VM.

> b) I also see that I need to call com::shutdown() after the save and
> com::Initialize() and restart the session, get the console object etc.
> Is this needed or am I doing something wrong ?

Impossible to tell what you're doing from your description... creating a 
snapshot leaves the VM running, so it's totally unclear what API calls 
you do in the mean time. Generally com::Initialize() needs to be called 
only once and likewise com::Shutdown() only needs to be used after the 
last API method use when the client application exits.


> Thanks
> _______________________________________________
> vbox-dev mailing list
> vbox-dev at virtualbox.org
> https://www.virtualbox.org/mailman/listinfo/vbox-dev

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