GetGuiResource for whole system

Question

Hi,

I'm trying to add the info from GetGuiResources to the exception handling system of my application. Getting the values for the current process is not a big deal, but I would like to add the values for the whole system as well.

So I tried:

foreach (Process p in Process.GetProcesses())
{
   gdiHandles += GetGuiResources(p.Handle, 0);
   userHandles += GetGuiResources(p.Handle, 1);
}

But this throws an exception, because for some processes it is not allowed to access the .Handle property. So my question is, how do I get the number of used GDI and USER handles for the whole system?

tia Martin