/// <summary>
/// Returns the existing RCW or create a new RCW from the COM interface pointer
/// NOTE: This does not do any unboxing at all.
/// </summary>
/// <param name="expectedContext">
/// The current context of this thread. If it is passed and is not Default, we'll check whether the
/// returned RCW from cache matches this expected context. If it is not a match (from a different
/// context, and is not free threaded), we'll go ahead ignoring the cached entry, and create a new
/// RCW instead - which will always end up in the current context
/// We'll skip the check if current == ContextCookie.Default.
/// </param>
private static object ComInterfaceToComObjectInternal_NoCache(
IntPtr pComItf,
IntPtr pComIdentityIUnknown,
RuntimeTypeHandle interfaceType,
RuntimeTypeHandle classTypeInSignature,
ContextCookie expectedContext,
CreateComObjectFlags flags,
out string className
)
{
className = null;
//
// Lookup RCW in global RCW cache based on the identity IUnknown
//
__ComObject comObject = ComObjectCache.Lookup(pComIdentityIUnknown);
if (comObject != null)
{
bool useThisComObject = true;
if (!expectedContext.IsDefault)
{
//
// Make sure the returned RCW matches the context we specify (if any)
//
if (!comObject.IsFreeThreaded &&
!comObject.ContextCookie.Equals(expectedContext))
{
//
// This is a mismatch.
// We only care about context for WinRT factory RCWs (which is the only place we are
// passing in the context right now).
// When we get back a WinRT factory RCW created in a different context. This means the
// factory is a singleton, and the returned IActivationFactory could be either one of
// the following:
// 1) A raw pointer, and it acts like a free threaded object
// 2) A proxy that is used across different contexts. It might maintain a list of contexts
// that it is marshaled to, and will fail to be called if it is not marshaled to this
// context yet.
//
// In this case, it is unsafe to use this RCW in this context and we should proceed
// to create a duplicated one instead. It might make sense to have a context-sensitive
// RCW cache but I don't think this case will be common enough to justify it
//
// @TODO: Check for DCOM proxy as well
useThisComObject = false;
}
}
if (useThisComObject)
{
//
// We found one - AddRef and return
//
comObject.AddRef();
return comObject;
}
}
string winrtClassName = null;
bool isSealed = false;
if (!classTypeInSignature.IsNull())
{
isSealed = classTypeInSignature.IsSealed();
}
//
// Only look at runtime class name if the class type in signature is not sealed
// NOTE: In the case of System.Uri, we are not pass the class type, only the interface
//
if (!isSealed &&
(flags & CreateComObjectFlags.SkipTypeResolutionAndUnboxing) == 0)
{
IntPtr pInspectable;
bool needRelease = false;
if (interfaceType.IsWinRTInterface())
{
//
// Use the interface pointer as IInspectable as we know it is indeed a WinRT interface that
// derives from IInspectable
//
pInspectable = pComItf;
}
else if ((flags & CreateComObjectFlags.IsWinRTObject) != 0)
{
//
// Otherwise, if someone tells us that this is a WinRT object, but we don't have a
// IInspectable interface at hand, we'll QI for it
//
pInspectable = McgMarshal.ComQueryInterfaceNoThrow(pComItf, ref Interop.COM.IID_IInspectable);
needRelease = true;
}
else
{
pInspectable = default(IntPtr);
}
try
{
if (pInspectable != default(IntPtr))
{
className = McgComHelpers.GetRuntimeClassName(pInspectable);
winrtClassName = className;
}
}
finally
{
if (needRelease && pInspectable != default(IntPtr))
{
McgMarshal.ComRelease(pInspectable);
pInspectable = default(IntPtr);
}
}
}
//
// 1. Prefer using the class returned from GetRuntimeClassName
// 2. Otherwise use the class (if there) in the signature
// 3. Out of options - create __ComObject
//
RuntimeTypeHandle classTypeToCreateRCW = default(RuntimeTypeHandle);
RuntimeTypeHandle interfaceTypeFromName = default(RuntimeTypeHandle);
if (!String.IsNullOrEmpty(className))
{
if (!McgModuleManager.TryGetClassTypeFromName(className, out classTypeToCreateRCW))
{
//
// If we can't find the class name in our map, try interface as well
// Such as IVector<Int32>
// This apparently won't work if we haven't seen the interface type in MCG
//
McgModuleManager.TryGetInterfaceTypeFromName(className, out interfaceTypeFromName);
}
}
if (classTypeToCreateRCW.IsNull())
classTypeToCreateRCW = classTypeInSignature;
// Use identity IUnknown to create the new RCW
// @TODO: Transfer the ownership of ref count to the RCW
if (classTypeToCreateRCW.IsNull())
{
//
// Create a weakly typed RCW because we have no information about this particular RCW
// @TODO - what if this RCW is not seen by MCG but actually exists in WinMD and therefore we
// are missing GCPressure and ComMarshallingType information for this object?
//
comObject = new __ComObject(pComIdentityIUnknown, default(RuntimeTypeHandle));
}
else
{
//
// Create a strongly typed RCW based on RuntimeTypeHandle
//
comObject = CreateComObjectInternal(classTypeToCreateRCW, pComIdentityIUnknown); // Use identity IUnknown to create the new RCW
}
#if DEBUG
//
// Remember the runtime class name for debugging purpose
// This way you can tell what the class name is, even when we failed to create a strongly typed
// RCW for it
//
comObject.m_runtimeClassName = className;
#endif
//
// Make sure we QI for that interface
//
if (!interfaceType.IsNull())
{
comObject.QueryInterface_NoAddRef_Internal(interfaceType, /* cacheOnly= */ false, /* throwOnQueryInterfaceFailure= */ false);
}
return comObject;
}