static Func <IntPtr, object> getFactory(Type tInterface)
{
Func <IntPtr, object> factory = null;
lock ( syncRoot )
{
if (factories.TryGetValue(tInterface, out factory))
{
return(factory);
}
Func <IntPtr, object> newProxy = Proxy.build(tInterface);
factory = ( IntPtr pNative ) =>
{
RuntimeClass rc = LiveObjectsCache.nativeLookup(pNative);
if (null != rc)
{
return(rc);
}
ManagedObject mo = LiveObjectsCache.managedLookup(pNative);
if (null != mo)
{
return(mo.managed);
}
return(newProxy(pNative));
};
factories.Add(tInterface, factory);
return(factory);
}
}
public ManagedObject(object managed, Guid iid, Delegate[] delegates)
{
this.managed = managed;
this.iid = iid;
IntPtr[] nativeTable = new IntPtr[delegates.Length + 4];
gchNativeData = GCHandle.Alloc(nativeTable, GCHandleType.Pinned);
LiveObjectsCache.managedAdd(address, this);
// A COM pointer is an address of address: "this" points to vtable pointer, vtable pointer points to the first vtable entry, the rest of the entries follow.
// We want binary compatibility, so nativeTable[ 0 ] contains address of nativeTable[ 1 ], and methods function pointers start at nativeTable[ 1 ].
nativeTable[0] = address + Marshal.SizeOf <IntPtr>();
// Build 3 first entries of the vtable, with IUnknown methods
queryInterface = delegate(IntPtr pThis, ref Guid ii, out IntPtr result) { Debug.Assert(pThis == address); return(implQueryInterface(ref ii, out result)); };
nativeTable[1] = Marshal.GetFunctionPointerForDelegate(queryInterface);
addRef = delegate(IntPtr pThis) { Debug.Assert(pThis == address); return(implAddRef()); };
nativeTable[2] = Marshal.GetFunctionPointerForDelegate(addRef);
release = delegate(IntPtr pThis) { Debug.Assert(pThis == address); return(implRelease()); };
nativeTable[3] = Marshal.GetFunctionPointerForDelegate(release);
// Custom methods entries of the vtable
for (int i = 0; i < delegates.Length; i++)
{
nativeTable[i + 4] = Marshal.GetFunctionPointerForDelegate(delegates[i]);
}
;
}
/// <summary>Construct the wrapper.</summary>
public RuntimeClass(IntPtr ptr, IntPtr[] vtbl, Guid iid)
{
nativePointer = ptr;
this.iid = iid;
QueryInterface = Marshal.GetDelegateForFunctionPointer <IUnknown.QueryInterface>(vtbl[0]);
AddRef = Marshal.GetDelegateForFunctionPointer <IUnknown.AddRef>(vtbl[1]);
Release = Marshal.GetDelegateForFunctionPointer <IUnknown.Release>(vtbl[2]);
LiveObjectsCache.nativeAdd(ptr, this);
}
/// <summary>Release native COM pointer. If it reaches 0, causes C++ to run `delete this`. Safe to be called multiple times, only the first one will work.</summary>
public void releaseInterfacePointer()
{
if (!pointerReleased)
{
pointerReleased = true;
if (nativePointer != IntPtr.Zero)
{
LiveObjectsCache.nativeDrop(nativePointer);
Release(nativePointer);
}
}
}
public IntPtr wrap(T managed, bool addRef)
{
lock ( syncRoot )
{
object cached;
IntPtr result;
if (native.TryGetValue(managed, out cached))
{
result = (IntPtr)cached;
if (addRef)
{
LiveObjectsCache.addRef(result);
}
return(result);
}
result = factory(managed, addRef);
native.Add(managed, result);
return(result);
}
}
