Unloading COM dlls, help needed

Thomas Heller theller at python.net
Fri Jan 24 19:01:39 CET 2003

"Neil Hodgson" <nhodgson at bigpond.net.au> writes:

> Thomas Heller:
> > I think I got everything correct, COM reference counting seems OK,
> > DllCanUnloadNow returns correct values, all I can think of.
>    I recall much discussion of this sort of thing when I was doing COM work
> several years ago with Microsoft applications avoiding and delaying
> unloading DLLs because of bugs in COM objects.
>    Google Groups for "CoFreeUnusedLibraries explorer" and you will see
> comments like "I just did a couple of tests with SHLoadInProc on W2K and it
> appears that they no longer bother about unloading DLLs at all. The 10
> minute unload time of Win9x and NT4 may have been annoying, but it was
> better than nothing." There is a technique for reducing the wait on other
> versions of Windows:
> [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\explorer]
> AlwaysUnloadDll=1
>    Search for AlwaysUnloadDll on MSDN for some useful information.

Thanks, Neil. Very useful, that should push me into the right


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