Grigory,
It seems to be a problem with the way Python/MSCOM bridge treats
multiple return arguments. As one can see from the .xidl file, method is
described as following:
<method name="getFramebuffer">
<desc>
Queries the framebuffer for given screen.
</desc>
<param name="screenId" type="unsigned long" dir="in"/>
<param name="framebuffer" type="IFramebuffer" dir="out"/>
<param name="xOrigin" type="long" dir="out"/>
<param name="yOrigin" type="long" dir="out"/>
</method>
It takes one argument, and returns three. XPCOM bridge (used everywhere,
but on Windows) handles this method signature naturally, by generating
method that take one parameter and returns list. COM Python bridge (part
of Python for Windows extensions, not of VirtualBox) gets confused, as
expects 4 parameters, which really sounds wrong.
If you'll be able to recompile VirtualBox, then making framebuffer
"return", not "out" parameter in xidl may help. Will try to sort out
this issue once get back from vacations (~ 7 Jul).
Anyway, on Windows you may have other problems, as least have to invoke
different external program to capture window content by its id.
Thanks,
Nikolay
Grigory Petrov пишет:
It seems that my test on ubuntu was wrong: it works with some tinkering. It
seems that getFramebuffer() method is completely different on ubuntu and
windows. On windows, it takes 4 arguments and use 2-nd to return IFrameBuffer
object. On Ubuntu, it takes 1 argument and return IFrameBuffer object. So, how
to use it on windows?
On Thursday, June 25, 2009, at 08:12AM, "Grigory Petrov" <[email protected]> wrote:
In virtualbox API documentation it is listed that getFramebuffer()
takes more than one parameter. I have tried your example code on both
windows and ubuntu, beta1 and beta2. It's always 'invalid number of
parameters' error. What is a trick to run a code you have suggested?
Best, Grigory Petrov
On Jun 23, 2009, at 2:21 PM, Nikolay Igotti <[email protected]>
wrote:
Hi Grigory,
Yes, it is possible, although in somewhat convoluted way, for
example on Linux in vboxshell one can issue following command
(assuming you started guest in not headless mode):
vbox> guest nt4sp6 os.system('xwd -id '+str
(console.display.getFramebuffer(0)[0].winId)+'| xwdtopnm | pnmtopng
/tmp/Screenshot.png')
It will take screen of the first display in guest called 'nt4sp6',
although relying upon few external programs
for image conversion. Similar approach can be taken on Windows.
We're considering implementing more straightforward API in the future.
Thanks,
Nikolay
Grigory Petrov wrote:
Hello.
Is it possible to use Python API in order to get image of guest os
display? (complete display or part of display, with or without
guest additions, it doesn't matter). I can speculate that this can
be done somehow via getFramebuffer() method, but exact sequence is
unclear - it's no example available :(.
Best, Grigory
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