[RESOLVED] Query the PDK for ISurfaceQueryManagerV400

[BenBaron]

Hi all,

although I've already touched briefly on this subject in another thread, I thought it might be best to start a new one for this, specifically.

Is anyone able to get the above mentioned service? The SDK reads "General surface queries, not associated with a specific object. This service interface is available from the PDK. Inherits IUnknown." I tried to query for it doing it like this:

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CComPtr<ISurfaceQueryManagerV400> surfaceQueryManager; PdkServices::GetPdk()->QueryInterface(IID_ISurfaceQueryManagerV400, (void**)&surfaceQueryManager);

but all I get is a HRESULT of E_NOINTERFACE and a nullptr surfaceQueryManager.

Would someone of the devs be so kind to shed a light on this, or can someone else try if they are able to get this interface?

Otherwise, I would need to additionally implement SimConnect to query for the surface elevation without a SimObject in place, but I'd rather not want to do this, if it wasn't strictly necessary.

So, any help is highly appreciated.

All the best, Benny

[Mike Schroeter]

You're close, but you need to use QueryService rather than QueryInterface, e.g.:

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CComPtr<ISurfaceQueryManagerV400> surfaceQueryManager;

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PdkServices::GetPdk()->QueryService(SID_SurfaceQueryManager, IID_ISurfaceQueryManagerV400, (void**)&surfaceQueryManager);

QueryInterface asks the object (PDK in your case) to return itself with a specified IID. QueryService asks the object if it can provide a specified service with a specified interface.

Hope this helps,
Mike

[BenBaron]

Thanks very much, Mike, for clarifying this.

Now, I really get the purposes of QueryInterface and QueryService and their respective parameter lists.

And, as expected, it now works like a charm.

All the best to you,

Benny