public COMCallableIUnknown()
{
_handle = GCHandle.Alloc(this);
IUnknownVTable * vtable = (IUnknownVTable *)Marshal.AllocHGlobal(sizeof(IUnknownVTable)).ToPointer();
QueryInterfaceDelegate qi = new QueryInterfaceDelegate(QueryInterfaceImpl);
vtable->QueryInterface = Marshal.GetFunctionPointerForDelegate(qi);
_delegates.Add(qi);
AddRefDelegate addRef = new AddRefDelegate(AddRefImpl);
vtable->AddRef = Marshal.GetFunctionPointerForDelegate(addRef);
_delegates.Add(addRef);
ReleaseDelegate release = new ReleaseDelegate(ReleaseImpl);
vtable->Release = Marshal.GetFunctionPointerForDelegate(release);
_delegates.Add(release);
IUnknownObject = Marshal.AllocHGlobal(IntPtr.Size);
*(void **)IUnknownObject = vtable;
_interfaces.Add(IUnknownGuid, IUnknownObject);
}
/// <summary>
/// Release an IUnknown pointer.
/// </summary>
/// <param name="pUnk">A pointer to the IUnknown interface to release.</param>
/// <returns>The result of pUnk->Release().</returns>
public static unsafe int Release(IntPtr pUnk)
{
if (pUnk == IntPtr.Zero)
{
return(0);
}
IUnknownVTable *vtable = *(IUnknownVTable **)pUnk;
ReleaseDelegate release = (ReleaseDelegate)Marshal.GetDelegateForFunctionPointer(vtable->Release, typeof(ReleaseDelegate));
return(release(pUnk));
}
protected CallableCOMWrapper(CallableCOMWrapper toClone)
{
if (toClone._disposed)
{
throw new ObjectDisposedException(GetType().FullName);
}
Self = toClone.Self;
_unknownVTable = toClone._unknownVTable;
_library = toClone._library;
AddRef();
_library.AddRef();
}
private protected CallableCOMWrapper(RefCountedFreeLibrary library, ref Guid desiredInterface, IntPtr pUnknown)
{
_library = library;
_library.AddRef();
IUnknownVTable *tbl = *(IUnknownVTable **)pUnknown;
var queryInterface = (QueryInterfaceDelegate)Marshal.GetDelegateForFunctionPointer(tbl->QueryInterface, typeof(QueryInterfaceDelegate));
int hr = queryInterface(pUnknown, ref desiredInterface, out IntPtr pCorrectUnknown);
if (hr != 0)
{
GC.SuppressFinalize(this);
throw new InvalidOperationException();
}
var release = (ReleaseDelegate)Marshal.GetDelegateForFunctionPointer(tbl->Release, typeof(ReleaseDelegate));
int count = release(pUnknown);
Self = pCorrectUnknown;
_unknownVTable = *(IUnknownVTable **)pCorrectUnknown;
}
internal CallableCOMWrapper(DacLibrary library, ref Guid desiredInterface, IntPtr pUnknown)
{
Interlocked.Increment(ref _totalInstances);
IUnknownVTable *tbl = *(IUnknownVTable **)pUnknown;
var queryInterface = (QueryInterfaceDelegate)Marshal.GetDelegateForFunctionPointer(tbl->QueryInterface, typeof(QueryInterfaceDelegate));
int hr = queryInterface(pUnknown, ref desiredInterface, out IntPtr pCorrectUnknown);
if (hr != 0)
{
GC.SuppressFinalize(this);
throw new InvalidOperationException();
}
var release = (ReleaseDelegate)Marshal.GetDelegateForFunctionPointer(tbl->Release, typeof(ReleaseDelegate));
release(pUnknown);
Self = pCorrectUnknown;
_unknownVTable = *(IUnknownVTable **)pCorrectUnknown;
_library = GCHandle.Alloc(library);
}
protected CallableCOMWrapper(RefCountedFreeLibrary library, ref Guid desiredInterface, IntPtr pUnknown)
{
_library = library;
_library.AddRef();
IUnknownVTable *tbl = *(IUnknownVTable **)pUnknown;
QueryInterfaceDelegate queryInterface = (QueryInterfaceDelegate)Marshal.GetDelegateForFunctionPointer(tbl->QueryInterface, typeof(QueryInterfaceDelegate));
int hr = queryInterface(pUnknown, ref desiredInterface, out IntPtr pCorrectUnknown);
if (hr != 0)
{
GC.SuppressFinalize(this);
throw new InvalidCastException($"{GetType().FullName}.QueryInterface({desiredInterface}) failed, hr=0x{hr:x}");
}
ReleaseDelegate release = (ReleaseDelegate)Marshal.GetDelegateForFunctionPointer(tbl->Release, typeof(ReleaseDelegate));
int count = release(pUnknown);
Self = pCorrectUnknown;
_unknownVTable = *(IUnknownVTable **)pCorrectUnknown;
}
