msimtf: Use an iface instead of a vtbl pointer in ActiveIMMApp.

dlls/msimtf/activeimmapp.c

@@ -42,10 +42,15 @@
 WINE_DEFAULT_DEBUG_CHANNEL(msimtf);
 
 typedef struct tagActiveIMMApp {
-    const IActiveIMMAppVtbl *vtbl;
+    IActiveIMMApp IActiveIMMApp_iface;
     LONG refCount;
 } ActiveIMMApp;
 
+static inline ActiveIMMApp *impl_from_IActiveIMMApp(IActiveIMMApp *iface)
+{
+    return CONTAINING_RECORD(iface, ActiveIMMApp, IActiveIMMApp_iface);
+}
+
 static void ActiveIMMApp_Destructor(ActiveIMMApp* This)
 {
     TRACE("\n");
@@ -55,7 +60,7 @@ static void ActiveIMMApp_Destructor(ActiveIMMApp* This)
 static HRESULT WINAPI ActiveIMMApp_QueryInterface (IActiveIMMApp* iface,
         REFIID iid, LPVOID *ppvOut)
 {
-    ActiveIMMApp *This = (ActiveIMMApp*)iface;
+    ActiveIMMApp *This = impl_from_IActiveIMMApp(iface);
     *ppvOut = NULL;
 
     if (IsEqualIID(iid, &IID_IUnknown) || IsEqualIID(iid, &IID_IActiveIMMApp))
@@ -75,13 +80,13 @@ static HRESULT WINAPI ActiveIMMApp_QueryInterface (IActiveIMMApp* iface,
 
 static ULONG WINAPI ActiveIMMApp_AddRef(IActiveIMMApp* iface)
 {
-    ActiveIMMApp *This = (ActiveIMMApp*)iface;
+    ActiveIMMApp *This = impl_from_IActiveIMMApp(iface);
     return InterlockedIncrement(&This->refCount);
 }
 
 static ULONG WINAPI ActiveIMMApp_Release(IActiveIMMApp* iface)
 {
-    ActiveIMMApp *This = (ActiveIMMApp*)iface;
+    ActiveIMMApp *This = impl_from_IActiveIMMApp(iface);
     ULONG ret;
 
     ret = InterlockedDecrement(&This->refCount);
@@ -818,7 +823,7 @@ HRESULT ActiveIMMApp_Constructor(IUnknown *pUnkOuter, IUnknown **ppOut)
     if (This == NULL)
         return E_OUTOFMEMORY;
 
-    This->vtbl = &ActiveIMMAppVtbl;
+    This->IActiveIMMApp_iface.lpVtbl = &ActiveIMMAppVtbl;
     This->refCount = 1;
 
     TRACE("returning %p\n",This);