Re: GetModuleHandle in DllMain?

"Igor Tandetnik" <>
Fri, 17 Jul 2009 19:39:13 -0400
Vincent Fatica <> wrote:

I'm causing the loading of my DLL (after the host app is running)
with an EXE to inject a remote thread which simply does
LoadLibrary("MyDll") ... that much is working. And I know USER32.DLL
and COMCTL32.DLL are already loaded by the host app.

Then, as described above, MyDll uses GetModuleHandle() for USER32.DLL
and COMCTL32.DLL ... uses GetProcAddress() for FindWindowW(),
SetWindowSubclass(), DefSubclassProc(), and RemoveWindowSubclass()
... finds the window of interest and subclasses it with a
SUBCLASSPROC in the DLL. That part isn't working.

From SetWindowSubclass documentation: Warning You cannot use the
subclassing helper functions to subclass a window across threads.

See if SetWindowsHookEx would help. You could set up WH_GETMESSAGE or
WH_CALLWNDPROC hook, then post a message (say, WM_NULL) to the window in
question. That will call the hook on the main UI thread. At this point
you can remove the hook and do the subclassing. Or, you could just use
the hook for all your message intercepting needs.
With best wishes,
    Igor Tandetnik

With sufficient thrust, pigs fly just fine. However, this is not
necessarily a good idea. It is hard to be sure where they are going to
land, and it could be dangerous sitting under them as they fly
overhead. -- RFC 1925

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