Re: System-wide hooking, VB+ASM

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On Wed, 1 Jun 2005 20:11:13 -0700, "Sam Hobbs"
<samuel@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

>"J French" <erewhon@xxxxxxxxxx> wrote in message
>news:429d9ab8.182192964@xxxxxxxxxxxxxxxxxxx
>>
>> The real question is: 'can you use an AX DLL for systemwide hooks ?'
>
>Actually, the question of the meaning of "regular DLL" and the related
>discussion is also real.

>> The answer is,
>> if it has the basic chassis of a 'real' DLL, then you can

>Unless you have, or are aware of, a real example of that then you can't say
>it is possible. Do you have an example of a system-wide hook using just VB?
>In other words, not using additional tools not provided with VB and/or not
>documented in the MSDN.

I have just done some experiments (with the usual horrendous crashes)
and have /not/ managed to make it work reliably.

A system wide keyboard hook installs and uninstalls Ok, but I got
crashes when the DLL was being mapped into another process's address
space.

Since the mapping takes place 'on demand' (ie: when you press a key
over another App) it is difficult to tell whether it is the mapping
that is causing the crash, or the actual hook routine.

I'm a little wary of playing with this as crashes are pretty
unpleasant
- for me the fact that I have not got it working, does not mean it is
impossible.


.

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