quartz: Check whether the pin is connected in IVideoWindow::put_MessageDrain().

dlls/quartz/tests/videorenderer.c

@@ -2399,6 +2399,9 @@ static void test_video_window(void)
     hr = IVideoWindow_put_Owner(window, (OAHWND)our_hwnd);
     ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
 
+    hr = IVideoWindow_put_MessageDrain(window, (OAHWND)our_hwnd);
+    ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
+
     testfilter_init(&source);
     IFilterGraph2_AddFilter(graph, &source.filter.IBaseFilter_iface, NULL);
     IFilterGraph2_AddFilter(graph, filter, NULL);

dlls/quartz/tests/vmr7.c

@@ -2398,6 +2398,9 @@ static void test_video_window(void)
     hr = IVideoWindow_put_Owner(window, (OAHWND)our_hwnd);
     ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
 
+    hr = IVideoWindow_put_MessageDrain(window, (OAHWND)our_hwnd);
+    ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
+
     testfilter_init(&source);
     IFilterGraph2_AddFilter(graph, &source.filter.IBaseFilter_iface, NULL);
     IFilterGraph2_AddFilter(graph, filter, NULL);

dlls/quartz/tests/vmr9.c

@@ -2624,6 +2624,9 @@ static void test_video_window(void)
     hr = IVideoWindow_put_Owner(window, (OAHWND)our_hwnd);
     ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
 
+    hr = IVideoWindow_put_MessageDrain(window, (OAHWND)our_hwnd);
+    ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
+
     testfilter_init(&source);
     IFilterGraph2_AddFilter(graph, &source.filter.IBaseFilter_iface, NULL);
     IFilterGraph2_AddFilter(graph, filter, NULL);

dlls/quartz/window.c

@@ -511,11 +511,14 @@ HRESULT WINAPI BaseControlWindowImpl_get_Owner(IVideoWindow *iface, OAHWND *Owne
 
 HRESULT WINAPI BaseControlWindowImpl_put_MessageDrain(IVideoWindow *iface, OAHWND Drain)
 {
-    struct video_window *This = impl_from_IVideoWindow(iface);
+    struct video_window *window = impl_from_IVideoWindow(iface);
+
+    TRACE("window %p, drain %#Ix.\n", window, Drain);
 
-    TRACE("window %p, drain %#Ix.\n", This, Drain);
+    if (!window->pPin->peer)
+        return VFW_E_NOT_CONNECTED;
 
-    This->hwndDrain = (HWND)Drain;
+    window->hwndDrain = (HWND)Drain;
 
     return S_OK;
 }