public override unsafe int TryAs <U>(Guid iid, out ObjectReference <U> objRef)
{
objRef = null;
int hr = VftblIUnknown.QueryInterface(ThisPtr, ref iid, out IntPtr thatPtr);
if (hr >= 0)
{
if (IsAggregated)
{
Marshal.Release(thatPtr);
}
AddRefFromTrackerSource();
using (var contextCallbackReference = ObjectReference <ABI.WinRT.Interop.IContextCallback.Vftbl> .FromAbi(_contextCallbackPtr))
{
objRef = new ObjectReferenceWithContext <U>(thatPtr, contextCallbackReference.GetRef())
{
IsAggregated = IsAggregated,
PreventReleaseOnDispose = IsAggregated,
ReferenceTrackerPtr = ReferenceTrackerPtr
};
}
}
return(hr);
}
// Calls the given callback in the right context.
// On any exception, calls onFail callback if any set.
// If not set, exception is handled due to today we don't
// have any scenario to propagate it from here.
public unsafe static void CallInContext(IntPtr contextCallbackPtr, IntPtr contextToken, Action callback, Action onFailCallback)
{
// Check if we are already on the same context, if so we do not need to switch.
if (contextCallbackPtr == IntPtr.Zero || GetContextToken() == contextToken)
{
callback();
return;
}
ComCallData data = default;
var contextCallback = new ABI.WinRT.Interop.IContextCallback(ObjectReference <ABI.WinRT.Interop.IContextCallback.Vftbl> .FromAbi(contextCallbackPtr));
try
{
contextCallback.ContextCallback(_ =>
{
callback();
return(0);
}, &data, IID_ICallbackWithNoReentrancyToApplicationSTA, 5);
}
catch (Exception)
{
onFailCallback?.Invoke();
}
}
public override unsafe int TryAs <U>(Guid iid, out ObjectReference <U> objRef)
{
objRef = null;
int hr = VftblIUnknown.QueryInterface(ThisPtr, ref iid, out IntPtr thatPtr);
if (hr >= 0)
{
using (var contextCallbackReference = ObjectReference <ABI.WinRT.Interop.IContextCallback.Vftbl> .FromAbi(_contextCallbackPtr))
{
objRef = new ObjectReferenceWithContext <U>(thatPtr, contextCallbackReference.GetRef());
}
}
return(hr);
}
public static IObjectReference GetObjectReferenceForInterface(IntPtr externalComObject)
{
using var unknownRef = ObjectReference<IUnknownVftbl>.FromAbi(externalComObject);
if (unknownRef.TryAs<IUnknownVftbl>(typeof(ABI.WinRT.Interop.IAgileObject.Vftbl).GUID, out var agileRef) >= 0)
{
agileRef.Dispose();
return unknownRef.As<IUnknownVftbl>();
}
else
{
return new ObjectReferenceWithContext<IUnknownVftbl>(
unknownRef.GetRef(),
Context.GetContextCallback());
}
}
public static IInspectable FromAbi(IntPtr thisPtr) => new IInspectable(ObjectReference <Vftbl> .FromAbi(thisPtr));
