oleacc: Add IOleWindow::GetWindow implementation in default client accessible object.

dlls/oleacc/client.c

@@ -471,8 +471,11 @@ static ULONG WINAPI Client_OleWindow_Release(IOleWindow *iface)
 static HRESULT WINAPI Client_OleWindow_GetWindow(IOleWindow *iface, HWND *phwnd)
 {
     Client *This = impl_from_Client_OleWindow(iface);
-    FIXME("(%p)->(%p)\n", This, phwnd);
-    return E_NOTIMPL;
+
+    TRACE("(%p)->(%p)\n", This, phwnd);
+
+    *phwnd = This->hwnd;
+    return S_OK;
 }
 
 static HRESULT WINAPI Client_OleWindow_ContextSensitiveHelp(IOleWindow *iface, BOOL fEnterMode)

dlls/oleacc/tests/main.c

@@ -384,7 +384,7 @@ static void test_default_client_accessible_object(void)
     IAccessible *acc;
     IDispatch *disp;
     IOleWindow *ow;
-    HWND chld, hwnd;
+    HWND chld, hwnd, hwnd2;
     HRESULT hr;
     VARIANT vid, v;
     BSTR str;
@@ -407,6 +407,9 @@ static void test_default_client_accessible_object(void)
 
     hr = IAccessible_QueryInterface(acc, &IID_IOleWindow, (void**)&ow);
     ok(hr == S_OK, "got %x\n", hr);
+    hr = IOleWindow_GetWindow(ow, &hwnd2);
+    ok(hr == S_OK, "got %x\n", hr);
+    ok(hwnd == hwnd2, "hwnd2 = %p, expected %p\n", hwnd2, hwnd);
     IOleWindow_Release(ow);
 
     hr = IAccessible_get_accChildCount(acc, &l);