public static object CreateRcwForComObject(IntPtr ptr)
{
if (ptr == IntPtr.Zero)
{
return(null);
}
IObjectReference identity = GetObjectReferenceForInterface(ptr).As <IUnknownVftbl>();
object keepAliveSentinel = null;
Func <IntPtr, System.WeakReference <object> > rcwFactory = (_) =>
{
object runtimeWrapper = null;
if (identity.TryAs <IInspectable.Vftbl>(out var inspectableRef) == 0)
{
var inspectable = new IInspectable(identity);
string runtimeClassName = inspectable.GetRuntimeClassName();
runtimeWrapper = TypedObjectFactoryCache.GetOrAdd(runtimeClassName, className => CreateTypedRcwFactory(className))(inspectable);
}
else if (identity.TryAs <ABI.WinRT.Interop.IWeakReference.Vftbl>(out var weakRef) == 0)
{
runtimeWrapper = new ABI.WinRT.Interop.IWeakReference(weakRef);
}
keepAliveSentinel = runtimeWrapper; // We don't take a strong reference on runtimeWrapper at any point, so we need to make sure it lives until it can get assigned to rcw.
var runtimeWrapperReference = new System.WeakReference <object>(runtimeWrapper);
var cleanupSentinel = new RuntimeWrapperCleanup(identity.ThisPtr, runtimeWrapperReference);
return(runtimeWrapperReference);
};
internal static bool TryGetMarshalerTypeForProjectedRuntimeClass(IObjectReference objectReference, out Type type)
{
if (objectReference.TryAs <IInspectable.Vftbl>(out var inspectablePtr) == 0)
{
rwlock.EnterReadLock();
try
{
IInspectable inspectable = inspectablePtr;
string runtimeClassName = inspectable.GetRuntimeClassName(true);
if (runtimeClassName is object)
{
if (ProjectedRuntimeClassNames.Contains(runtimeClassName))
{
type = CustomTypeToHelperTypeMappings[CustomAbiTypeNameToTypeMappings[runtimeClassName]];
return(true);
}
}
}
finally
{
inspectablePtr.Dispose();
rwlock.ExitReadLock();
}
}
type = null;
return(false);
}
protected override object CreateObject(IntPtr externalComObject, CreateObjectFlags flags)
{
IObjectReference objRef = ComWrappersSupport.GetObjectReferenceForInterface(externalComObject);
if (objRef.TryAs <IInspectable.Vftbl>(out var inspectableRef) == 0)
{
IInspectable inspectable = new IInspectable(inspectableRef);
string runtimeClassName = inspectable.GetRuntimeClassName(noThrow: true);
return(runtimeClassName switch
{
"Windows.Data.Text.WordSegment" => new MS.Internal.WindowsRuntime.Windows.Data.Text.WordSegment(new MS.Internal.WindowsRuntime.ABI.Windows.Data.Text.IWordSegment(objRef)),
_ => inspectable
});
internal static string GetRuntimeClassForTypeCreation(IInspectable inspectable, Type staticallyDeterminedType)
{
string runtimeClassName = inspectable.GetRuntimeClassName(noThrow: true);
if (staticallyDeterminedType != null && staticallyDeterminedType != typeof(object))
{
// We have a static type which we can use to construct the object. But, we can't just use it for all scenarios
// and primarily use it for tear off scenarios and for scenarios where runtimeclass isn't accurate.
// For instance if the static type is an interface, we return an IInspectable to represent the interface.
// But it isn't convertable back to the class via the as operator which would be possible if we use runtimeclass.
// Similarly for composable types, they can be statically retrieved using the parent class, but can then no longer
// be cast to the sub class via as operator even if it is really an instance of it per rutimeclass.
// To handle these scenarios, we use the runtimeclass if we find it is assignable to the statically determined type.
// If it isn't, we use the statically determined type as it is a tear off.
Type implementationType = null;
if (!string.IsNullOrEmpty(runtimeClassName))
{
try
{
(implementationType, _) = TypeNameSupport.FindTypeByName(runtimeClassName.AsSpan());
}
catch (TypeLoadException)
{
}
}
if (!(implementationType != null &&
(staticallyDeterminedType == implementationType ||
staticallyDeterminedType.IsAssignableFrom(implementationType) ||
staticallyDeterminedType.IsGenericType && implementationType.GetInterfaces().Any(i => i.IsGenericType && i.GetGenericTypeDefinition() == staticallyDeterminedType.GetGenericTypeDefinition()))))
{
runtimeClassName = TypeNameSupport.GetNameForType(staticallyDeterminedType, TypeNameGenerationFlags.GenerateBoxedName);
}
}
return runtimeClassName;
}
