[vbox-dev] Concurrent Remote Python Sessions

Robert Ramsay robert.alan.ramsay at gmail.com
Sun May 23 00:23:37 GMT 2010

Hi Nikolay,

That did the trick! Thank you again for your quick and direct support.
I'll be sure to include a code snippet with my next VirtualBox issue.

Is the VirtualBox Web Console project being accepting patches? I'd be
glad to help out withsome of those to-do comments.

On Sat, May 22, 2010 at 10:12 AM, Nikolay Igotti <Nikolay.Igotti at sun.com> wrote:
>  Robert,
> As an example of multithreaded Python app using VBox API please refer to
> vboxweb - http://code.google.com/p/vboxweb/source/browse/trunk/VBoxWebSrv.py
> What you likely need, is pythoncom.CoMarshalInterThreadInterfaceInStream
> magic (and calling mgr.initPerThread() in new thread start routine ).
> Usually, it makes sense to post minimal code snippets when asking questions
> like this.
> Thanks,
> Nikolay
> Robert Ramsay пишет:
>> To Nikolay and all VirtualBox developers:
>> Thanks for a great 3.2 release! The python API has been updated and
>> fixed my previous error. But now I have a new issue. I can't seem to
>> make concurrent "session's" with python. When two different python
>> scripts try to use openExistingSession in the same thread it works
>> fine. But If I use openExistingSession in two different threads or if
>> I use a session object in a new thread it gives the COM error:
>> (-2147417842, 'The Application called an interface that was marshalled
>> for a different thread.'). And If I try to create a VirtualBoxManager
>> in two different threads I get infinitely recursive COM get_name
>> loops. The documentation says that openExistingSession should allow
>> multiple sessions. I was able to do use threading with indifference to
>> the session objects using the 3.1.6 SDK/API.
>> Thanks,
>> Robert
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