[wdmaudiodev] Re: Problem writing to endpoint property store using Standard user account on Vista

  • From: "Michael R. Preston" <mike@xxxxxxxxxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Thu, 19 Oct 2006 08:48:16 -0700

Thanks, Mitch.  It's greatly appreciated.

Mike

Mitchell Rundle wrote:
I'll look into this and get back to you soon.

Thanks Mitch

-----Original Message----- From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Michael R.
Preston Sent: Thursday, October 19, 2006 8:39 AM To:
wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: Problem writing
to endpoint property store using Standard user account on Vista

Mitch, Is there any way to modify the permissions so the Sound
control panel will run as administrator (without modifying RunDLL32
for the whole system - that wouldn't be a good idea).

Mike

Mitchell Rundle wrote:

Correct.

-- Sysfx propertystore is always read/write for the sysfx ui
extensions. -- Endpoint propertystore permissions are determined by
users permissions.

BTW, the sample you are using must be outdated.
PKEY_AudioEndpoint_Disable_SysFx now lives in the sysfx
propertystore.  It was moved there so that sysfx ui extensions
would always have write access to it.

There is currently no way to make the endpoint propertystore
writable from cpl propertypages running as limited user.

Regards, Mitch


-----Original Message----- From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Michael R. Preston Sent: Wednesday, October 18, 2006 10:37 AM To:
wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re: Problem
writing to endpoint property store using Standard user account on
Vista


Well, that's only partly correct.  The prop page extension is only
handed a pointer to the system effects property store.  It isn't
handed a pointer to the endpoint property store.  For example in
the Swap APO sample code, the prop page extension code uses the
system effects property store for the "Enable Channel Swap GFX" and
"Enable Channel Swap LFX" properties, but uses the endpoint
property store for the "Disable System Effects" property.  Since
the prop page extension isn't handed a pointer to the endpoint
property store, it has to get it from the MMDevice through the
device enumerator.

The call to OpenPropertyStore() fails when trying to open the
endpoint property store for writing.  This seems to be because when
RunDLL32 is called to open the control panel, it's run with the
current user's username, not administrator.  So even passing the
prop page extension a pointer to the endpoint property store might
not even help, since it's not running in the proper context.  How
can we get the control panel to run as administrator when RunDLL32
is called?  Otherwise, no prop page extensions that use the
endpoint property store will work when running in a Standard user
account.

On a related note, I was able to get an external applicaton to
write to the endpoint property store simply by installing the app
under the "Program Files" directory while running in an
administrator account. Apparently, this causes the app to run as
administrator even when running in a Standard user account.

Mike

Larry Osterman wrote:


Signing the APO won't affect your ability to read or write to the
 property store.

If you use the IPropertyStore objects handed to your prop page extension in the sound control panel, you should be able to read
and write properties to that store.



-----Original Message----- From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of mike@xxxxxxxxxxxxxxxxxxx Sent: Wednesday, October 18, 2006 8:35
AM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Re:
Problem writing to endpoint property store using Standard user
account on Vista


Larry, Does this have anything to do with the fact that my APO
isn't signed, or just because the app isn't running as
administrator?  Like I said previously, I'm seing the same
problem with the property page extension for the endpoint in the
Sound control panel.  Also, is this just a problem with the
endpoint property store and not the system effects endpoint?

Mike

-----Original Message-----

From: Larry Osterman <Larry.Osterman@xxxxxxxxxxxxx> Subj: [wdmaudiodev] Re: Problem writing to endpoint property store
using Standard user account on Vista Date: Wed Oct 18, 2006 7:01
am Size: 2K To: "wdmaudiodev@xxxxxxxxxxxxx"
<wdmaudiodev@xxxxxxxxxxxxx>


That's correct.  The endpoint property store is machine-wide and
only administrators can modify it.  If you need to modify the
endpoint property store outside the mmsys.cpl framework, you need
to run your applet elevated.


-----Original Message----- From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Michael
R. Preston Sent: Tuesday, October 17, 2006 10:15 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Problem writing
to endpoint property store using Standard user account on Vista


I'm seeing a problem writing to the endpoint property store from
an application or from a property page extension in the Sound
control panel when running on a Standard user account.  When
doing an OpenPropertyStore() on the default endpoint's MMDevice
with either STGM_READWRITE or STGM_WRITE, the call fails.
Opening the property store with STGM_READ still works, though.
However, the exact same code (with STGM_READWRITE specified)
works on an administrator account. Could this be a problem with
unsigned drivers or APOs?  I noticed the problem in RC1, and it's
still there in RC2.  The problem doesn't happen with the built-in
system effects, but does happen with my custom APO. Anyone have
any ideas?

Thanks, Mike -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| Mike Preston | Home/Office: (360)756-1655 | | E-mail: mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 | |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
| The man who follows the crowd will usually get no | | further than the crowd. The man who walks alone is | | likely to find himself in places no one has ever been. | | --
Alan Ashley-Pitt | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
******************


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--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
Mike Preston | Home/Office: (360)756-1655 | | E-mail:
mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 | |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| |
The man who follows the crowd will usually get no | |
further than the crowd. The man who walks alone is | |
likely to find himself in places no one has ever been. | |
-- Alan Ashley-Pitt | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ******************


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-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | Mike Preston | Home/Office: (360)756-1655 | |
E-mail: mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 | |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| |
The man who follows the crowd will usually get no | |
further than the crowd. The man who walks alone is | |
likely to find himself in places no one has ever been. | |
-- Alan Ashley-Pitt | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ******************


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-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | Mike Preston | Home/Office: (360)756-1655 | | E-mail: mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 | |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| | The man who follows the crowd will usually get no | | further than the crowd. The man who walks alone is | | likely to find himself in places no one has ever been. | | -- Alan Ashley-Pitt | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ******************

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