| GetClassLongPtr(HandleRef, ClassLongValues) | Retrieves the specified value from the WNDCLASSEX structure associated with the specified window. |
| GetClassLongPtr(IntPtr, ClassLongValues) | Retrieves the specified value from the WNDCLASSEX structure associated with the specified window. |
| GetClassLongPtr(SafeHandle, ClassLongValues) | Retrieves the specified value from the WNDCLASSEX structure associated with the specified window. |