internal int GetOrCreateNativePointer(Type type, void **ppv)
{
if (!MicroComRuntime.GetVtableFor(type, out var vtable))
{
return(unchecked ((int)0x80004002u));
}
lock (_lock)
{
if (_shadows.TryGetValue(type, out var shadow))
{
var targetCcw = (Ccw *)shadow;
AddRef(targetCcw);
*ppv = targetCcw;
return(0);
}
else
{
var intPtr = Marshal.AllocHGlobal(Marshal.SizeOf <Ccw>());
var targetCcw = (Ccw *)intPtr;
* targetCcw = default;
targetCcw->RefCount = 0;
targetCcw->VTable = vtable;
if (_handle == null)
{
_handle = GCHandle.Alloc(this);
}
targetCcw->GcShadowHandle = GCHandle.ToIntPtr(_handle.Value);
_shadows[type] = intPtr;
_backShadows[intPtr] = type;
*ppv = targetCcw;
return(0);
}
}
}
int FreeCcw(Ccw *ccw)
{
lock (_lock)
{
// Shadow got resurrected by a call to QueryInterface from another thread
if (ccw->RefCount != 0)
{
return(ccw->RefCount);
}
var intPtr = new IntPtr(ccw);
var type = _backShadows[intPtr];
_backShadows.Remove(intPtr);
_shadows.Remove(type);
Marshal.FreeHGlobal(intPtr);
if (_shadows.Count == 0)
{
_handle?.Free();
_handle = null;
try
{
Target.OnUnreferencedFromNative();
}
catch (Exception e)
{
MicroComRuntime.UnhandledException(Target, e);
}
}
}
return(0);
}
public T QueryInterface <T>() where T : IUnknown
{
var guid = MicroComRuntime.GetGuidFor(typeof(T));
var rv = QueryInterface(guid, out var ppv);
if (rv == 0)
{
return((T)MicroComRuntime.CreateProxyFor(typeof(T), ppv, true));
}
throw new COMException("QueryInterface failed", rv);
}
internal int QueryInterface(Ccw *ccw, Guid *guid, void **ppv)
{
if (MicroComRuntime.TryGetTypeForGuid(*guid, out var type))
{
return(QueryInterface(type, ppv));
}
else
{
return(unchecked ((int)0x80004002u));
}
}
internal int AddRef(Ccw *ccw)
{
if (Interlocked.Increment(ref _refCount) == 1)
{
try
{
Target.OnReferencedFromNative();
}
catch (Exception e)
{
MicroComRuntime.UnhandledException(Target, e);
}
}
return(Interlocked.Increment(ref ccw->RefCount));
}
internal int QueryInterface(Ccw *ccw, Guid *guid, void **ppv)
{
if (MicroComRuntime.TryGetTypeForGuid(*guid, out var type))
{
return(QueryInterface(type, ppv));
}
else if (*guid == MicroComRuntime.ManagedObjectInterfaceGuid)
{
ccw->RefCount++;
*ppv = ccw;
return(0);
}
else
{
return(unchecked ((int)0x80004002u));
}
}