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

dlls/quartz/tests/videorenderer.c

@@ -2379,6 +2379,11 @@ static void test_video_window(void)
     hr = IVideoWindow_get_Caption(window, &caption);
     todo_wine ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
 
+    caption = SysAllocString(L"foo");
+    hr = IVideoWindow_put_Caption(window, caption);
+    ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
+    SysFreeString(caption);
+
     hr = IVideoWindow_get_WindowStyle(window, &l);
     todo_wine ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
 

dlls/quartz/tests/vmr7.c

@@ -2378,6 +2378,11 @@ static void test_video_window(void)
     hr = IVideoWindow_get_Caption(window, &caption);
     todo_wine ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
 
+    caption = SysAllocString(L"foo");
+    hr = IVideoWindow_put_Caption(window, caption);
+    ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
+    SysFreeString(caption);
+
     hr = IVideoWindow_get_WindowStyle(window, &l);
     todo_wine ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
 

dlls/quartz/tests/vmr9.c

@@ -2604,6 +2604,11 @@ static void test_video_window(void)
     hr = IVideoWindow_get_Caption(window, &caption);
     todo_wine ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
 
+    caption = SysAllocString(L"foo");
+    hr = IVideoWindow_put_Caption(window, caption);
+    ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
+    SysFreeString(caption);
+
     hr = IVideoWindow_get_WindowStyle(window, &l);
     todo_wine ok(hr == VFW_E_NOT_CONNECTED, "Got hr %#lx.\n", hr);
 

dlls/quartz/window.c

@@ -194,6 +194,9 @@ HRESULT WINAPI BaseControlWindowImpl_put_Caption(IVideoWindow *iface, BSTR capti
 
     TRACE("window %p, caption %s.\n", window, debugstr_w(caption));
 
+    if (!window->pPin->peer)
+        return VFW_E_NOT_CONNECTED;
+
     if (!SetWindowTextW(window->hwnd, caption))
         return E_FAIL;