[wdmaudiodev] Re: Create an object of an APO in a win32 APP

  • From: Abhinav Singh <abhinav4ever@xxxxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Wed, 24 Dec 2014 15:03:36 +0000

thanks…I was running trying to create the APO object from a 32 bit app which 
was causing this problem..I actually encountered this problem when trying to 
create an APO instance from a dll loaded in explorer.exe but somehow it always 
failed so I decided to check it on a simple win32 app…a restart fixed the issue 
with the dll loaded in the explorer as well.

Sent from Windows Mail

From: Matthew.van.Eerde@xxxxxxxxxxxxx
Sent: ‎Monday‎, ‎December‎ ‎22‎, ‎2014 ‎1‎:‎33‎ ‎PM
To: wdmaudiodev@xxxxxxxxxxxxx

If you’re running a 32-bit app on a 64-bit version of Windows, this is 
expected; APOs are typically native-only.


If you’re running native, check to see that the CLSID in question is registered 
under HKEY_CLASSES_ROOT\CLSID\{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} and that 
the hosting .dll exists.


From: wdmaudiodev-bounce@xxxxxxxxxxxxx 
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Abhinav Singh
Sent: Monday, December 22, 2014 1:24 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Create an object of an APO in a win32 APP



I am using the code below to create an object of an APO from a  normal win32 
app. The intention is to check whether the APO is installed in the PC. However 
i get a Class Not Registered error every time i execute the below piece of 




                 // CLSID_ClassID is the class GUID of the APO

                //IID_InterfaceID is the interface ID of the APO




                        CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);


                        HRESULT hr = S_OK;


                        IUnknown *pAPO = NULL;


                        hr = CoCreateInstance(CLSID_ClassID,





                        if (SUCCEEDED(hr))


                                    //APO found








                        return hr;


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