Re: DLLEntryPoint question...

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#15960

From: Russell Hind
Date: Thu, 05 Jun 2003 11:05

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MWP wrote:
> Hi all...
> 
> Why is DLLEntryPoint being called more often than just when LoadLibrary is run?

It is called more than once.  It is called for the reasons in the 
'reason' argument.  i.e.

DLL_PROCESS_ATTACH
DLL_THREAD_ATTACH
DLL_PROCESS_DETACH
DLL_THREAD_DETACH

If the dll creates lots of threads, then the entry point will get called 
for every thread that is created.  If you only want to perform actions 
in it when you load and unload it, then check against DLL_PROCESS_ATTACH 
and DLL_PROCESS_DETACH.

But remember, you are very limited in what you can do in the entry point 
because the only system functions that are safe to call are those from 
kernel32.dll.

That basically means most, if not all, of the std c lib and std c++ lib 
are out as is all of the VCL.  forcing a call into any other system 
routine other than those in kernel32.dll during this method causes 
un-predictable behaviour.

Cheers

Russell

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