[vbox-dev] Reading Guest Properties for running VM (SOAP APIs)

Klaus Espenlaub Klaus.Espenlaub at Sun.COM
Mon Jun 28 09:38:29 PDT 2010

Joseph Smith wrote:
> Hi,
> I am encountering some challenges when trying to retrieve guest 
> properties (enumerateGuestProperties) via the SOAP API.
> I am able to use this API and retreive guest properties if the guest is 
> not running ... but get a runtime exception if I try when the guest is 
> running.  I know it can be done since VBoxManage is able to ... but I'm 
> wondering if this could possibly be a vboxwebsrv  problem.  Essentially 
> ... the steps I use are:
> 1) Instantiate a new Session object
> 2) Using this session object ... try to open a new session (openSession)
> 3) If getting a new session fails ... try to open an existing session 
> (openExistingSession)
> 3) With the opened session object ... get the machine object reference 
> (ISession::machine)
> 4) Using the machine reference ... enumerate the guest properties 
> (ISession::enumerateGuestProperties)
> If the VM is not running ... it works perfectly.  If the VM is running 
> ... a runtime exception is thrown.  The error thrown is:
>      "VirtualBox error: Internal application error (0x2147500037)"

Printing 0x in front of a number doesn't make it hex ;)

This is error 0x80004005 = E_FAIL.

 From the looks you're not doing what you claim, as exactly this 
sequence works fine in VBoxManage. Sure that you're not accidentally 
using an IMachine reference returned by IVirtualBox::getMachine?


> Using the same Machine reference object I can retrieve other machine 
> specific information ... so I know the machine ref is valid 
> (additionally, the UUID on the machine ref matches the UUID of the VM).
> I am also able to use this same approach to getting a session for both a 
> non-running and running VM to start/stop/pause or otherwise manage a 
> VM.  As frequently suggested (<smile>) ... I have looked over how 
> VBoxManage does it ... and I am unable to see a difference between how 
> VBoxManage retreives the information when compared to they way I do.
> I'm sure I must be doing something wrong ... but it sure does not seem 
> very obvious.
> Anyone have any suggestions they can offer ?
> Thanks,
> Joe
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