Create a class and make it keep a track of those handles.

>How can I know wether an API handle still exists ?
>
>In GDIPLUS.DLL sometimes I use the function GDIPDELETEGRAPHICS, or GDIPDELETEFONT, or any other for clearing a handle, but if GDIPLUS's main handle was "closed", the other handles no more exist.
>
>How can I know if a handle is still in use ?