[wdmaudiodev] Re: How to bind a symbolic link to a mixer, midi or wave device name?

  • From: "Richard Fricks" <Richard.Fricks@xxxxxxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Thu, 9 Feb 2006 18:09:31 -0800

                "Thats probably the situation under XP -> the instance id is 
added by windows atomatically. Under Vista the instance id is missing (thats at 
least my experiance)."

                

Thanks for making us aware of your issues. I am working with the development 
teams to evaluate the impact of adding this feature back into Vista. 

Richard Fricks
Technical Lead, Microsoft DDK


________________________________

From: wdmaudiodev-bounce@xxxxxxxxxxxxx on behalf of uwe kirst
Sent: Thu 2/9/2006 8:30 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: How to bind a symbolic link to a mixer, midi or wave 
device name?



Yann Hamiaux wrote:

>So far, I've been able to enumerate all MIDI symbolic link and get their
>friendly name. However, when I have 2 devices with the same VID and PID, the
>friendly name is exactly the same. While when I look to the list mixer name
>they do have a different name "Mixer Device" and "Mixer Device (2)".
>
Thats probably the situation under XP -> the instance id is added by
windows atomatically.
Under Vista the instance id is missing (thats at least my experiance).
I tried to add it within my driver, but I found no reliable way of doing
so. If you have two physical identical devices and you install them
one after each other while the other is not powererd, they will get the
same name. If you now power them both, they will have the same name,
because the name is set during install not during driver load.
I personally would prefer to add the unique id owned by the device to
the friendly name, but this seem to be impossible because the names are
added during install by the .inf file. If no other idea comes to my mind
I think I will try to add a random (unique) name by my driver rather by
.inf file. Maybee that will help?

>So far,
>I deal with some SetupDi... functions to enumerate all devices in a
>category. I also, kind of reverse-engineer the GUID I need for the
>enumeration by looking to the registry under
>"Local_Machine\System\CurrentControlSet\Control\DeviceClasses\". Maybe there
>is a .h file I should look to have a proper list of these GUID?
>
> 
>
I was told that you generate these GUIDs by yourself with guigen. They
are added during installation by the .inf file. The header file only
cointains some predefined (by microsoft) device types.
Uwe

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