Re: RemoveWindowSubclass in DllMain (DETACH)
"Alexander Grigoriev" <alegr@earthlink.net> wrote in message
news:udA#FOE6JHA.936@TK2MSFTNGP06.phx.gbl...
This note is related to a case when the process is shutting down as a
result of ExitProcess call. In that case, you should simply return from
your DllMain.
Specifically, during process exit, all calls to DllMain(DLL_PROCESS_DETACH)
are made from the thread calling ExitProcess. But the docs for
SetWindowSubclass say:
Warning You cannot use the subclassing helper functions to subclass a
window across threads.
http://msdn.microsoft.com/en-us/library/bb762102(VS.85).aspx
So, I think adding a check that the current thread is the thread on which
the subclass was made will prevent the crash (when all other threads were
terminated, all windows running in those threads simple went away, no
WM_DESTROY).
"Vincent Fatica" <vince@blackholespam.net> wrote in message
news:4a2c8196$1@news.vefatica.net...
My plugin DLL subclasses a window involved in hosting it (with
SetWindowSubclass
(comctl32)). The only process termination notification I get is via
DLL_THREAD_DETACH and DLL_PROCESS_DETACH. I'm calling
RemoveWindowSubclass
(comctl32) in response to DLL_THREAD_DETACH and it's working (whereas
calling it
in response to DLL_PROCESS_DETACH or not calling it at all causes a
crash).
But the docs for DllMain warn (with reference to User, Shell, and COM
functions)
"calling functions such as these during termination can cause access
violation
errors because the corresponding component may already have been unloaded
or
uninitialized".
What am I to do?
One thought is to GetModuleHandle(L"COMCTL32", already loaded by host)
and dig
out the two needed functions rather than link my DLL with COMCTL32.
Would that
be any better. Is there anything easier?
Thanks.
--
- Vince
__________ Information from ESET NOD32 Antivirus, version of virus
signature database 4153 (20090613) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4153 (20090613) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com