[wdmaudiodev] Re: Hotkey implementation for APOs?
- From: Frank Yerrace <Frank.Yerrace@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Mon, 13 Nov 2006 14:27:05 -0800
In some ways this problem is similar to the problem of writing custom settings
from within a Sounds control panel extension. In a previous post on that
problem, I said this
//www.freelists.org/archives/wdmaudiodev/10-2006/msg00066.html,
//www.freelists.org/archives/wdmaudiodev/10-2006/msg00067.html.
For your problem, your hot-key handler can write a setting to your audio driver
as suggested in these links above. Using a similar mechanism, your SYSFX APO
can monitor KS events for changes on those settings and adjust their DSP. For
these settings, the audio driver acts as little more than a conduit and storage
for these settings since the SYSFX APO actually implements the DSP for them.
Frank Yerrace
Microsoft Corporation
This posting is provided "AS IS" with no warranties, and confers no rights.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx]
Sent: Monday, November 06, 2006 4:41 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Hotkey implementation for APOs?
Hi everyone,
We have an OEM that is going to be bundling one of our APOs on their
system. They already have a keyboard designed with a hotkey that can
toggle a property in our APO. (The key toggles through four states for
the APO.)
The question is: How do we inform any running APOs when the hotkey is
pressed? Their hotkey signals their own application, which is supposed
to inform any APOs that the property has changed. However, they cannot
use the property store, since applications do not have write access to
it.
We thought of writing to a registry key in HKLM, but the app does not
have write access to that either. (HKCU is out, since the hotkey app and
the APO are running under different accounts.)
We are also considering using shared memory and a named event to set the
value and trigger the event, but that seems problematic when multiple
APOs are running. (Or we'd have to maintain a list of events in shared
memory that need to be signaled when the hotkey was pressed.)
Overall, it seems like a lot of effort for what you would think should
be a simple solution. Any advice?
Thanks,
Jeff
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