mshtml: Added OleObject_Advise implementation.

dlls/mshtml/htmldoc.c

@@ -1951,6 +1951,8 @@ static ULONG WINAPI CustomDoc_Release(ICustomDoc *iface)
             This->basedoc.window->doc_obj = NULL;
             IHTMLWindow2_Release(HTMLWINDOW2(This->basedoc.window));
         }
+        if(This->basedoc.advise_holder)
+            IOleAdviseHolder_Release(This->basedoc.advise_holder);
 
         if(This->client)
             IOleObject_SetClientSite(OLEOBJ(&This->basedoc), NULL);

dlls/mshtml/mshtml_private.h

@@ -338,6 +338,8 @@ struct HTMLDocument {
     ConnectionPoint cp_htmldocevents;
     ConnectionPoint cp_htmldocevents2;
     ConnectionPoint cp_propnotif;
+
+    IOleAdviseHolder *advise_holder;
 };
 
 static inline HRESULT htmldoc_query_interface(HTMLDocument *This, REFIID riid, void **ppv)

dlls/mshtml/oleobj.c

@@ -380,8 +380,23 @@ static HRESULT WINAPI OleObject_GetExtent(IOleObject *iface, DWORD dwDrawAspect,
 static HRESULT WINAPI OleObject_Advise(IOleObject *iface, IAdviseSink *pAdvSink, DWORD *pdwConnection)
 {
     HTMLDocument *This = OLEOBJ_THIS(iface);
-    FIXME("(%p)->(%p %p)\n", This, pAdvSink, pdwConnection);
-    return E_NOTIMPL;
+    TRACE("(%p)->(%p %p)\n", This, pAdvSink, pdwConnection);
+
+    if(!pdwConnection)
+        return E_INVALIDARG;
+
+    if(!pAdvSink) {
+        *pdwConnection = 0;
+        return E_INVALIDARG;
+    }
+
+    if(!This->advise_holder) {
+        CreateOleAdviseHolder(&This->advise_holder);
+        if(!This->advise_holder)
+            return E_OUTOFMEMORY;
+    }
+
+    return IOleAdviseHolder_Advise(This->advise_holder, pAdvSink, pdwConnection);
 }
 
 static HRESULT WINAPI OleObject_Unadvise(IOleObject *iface, DWORD dwConnection)