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Jeff Kish
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 Posted: Sat Oct 28, 2006 8:10 am Post subject: hook / global hook question |
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Hi.
I see Matt Pietraks articel from 1997 about how to hook mouse messages
globally. I hear there is alot of overhead because the dll gets loaded
with every application.
Is there any way to code it up so it only gets loaded with selected
apps (I'd like to get the mouse wheel working for my old borland 5.02
compiler, and my intellimouse driver isn't doing the trick), so I
thought I'd write a dll.
Thanks
Jeff |
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Remy Lebeau (TeamB)
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| Posted: Sat Oct 28, 2006 8:10 am Post subject: Re: hook / global hook question |
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"Jeff Kish" <kishjjrjj (AT) charter (DOT) net> wrote in message
news:fuk5k254ku9car1evv300lnmosb2re3se8 (AT) 4ax (DOT) com...
| Quote: | I see Matt Pietraks articel from 1997 about how to hook mouse
messages globally. I hear there is alot of overhead because the
dll gets loaded with every application.
|
I don't know if I would call it "alot" of overhead, but a global hook DLL
does get injected into every running process, and can cause each application
to slow down if the hook is not performing efficient operations.
| Quote: | Is there any way to code it up so it only gets loaded with
selected apps
|
You would need to code the DLL's DllEntryPoint() function to dynamically
determine the application that is currently loading it, and then return
FALSE to cancel the loading if needed. You can use GetModuleFileName(),
specifying NULL as the module handle, to get the filename of the process
that is currently loading the DLL.
A less intrusion approach would be for your main application to monitor all
running processes, and then install thread-specific hooks for each desired
application when they start up. Enumerating the running processes will give
you the thread IDs of each process, and SetWindowsHookEx() can be used to
set up a single hook in a specific thread of an external application. Since
your main application, not the DLL, would be filtering the processe and
threads, the DLL would not be injected into unwanted applications, thus
reducing system resource usage.
Gambit |
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Jeff Kish
Guest
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| Posted: Sun Oct 29, 2006 8:22 am Post subject: Re: hook / global hook question |
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On Fri, 27 Oct 2006 23:24:04 -0700, "Remy Lebeau \(TeamB\)"
<no.spam (AT) no (DOT) spam.com> wrote:
| Quote: |
"Jeff Kish" <kishjjrjj (AT) charter (DOT) net> wrote in message
news:fuk5k254ku9car1evv300lnmosb2re3se8 (AT) 4ax (DOT) com...
I see Matt Pietraks articel from 1997 about how to hook mouse
messages globally. I hear there is alot of overhead because the
dll gets loaded with every application.
I don't know if I would call it "alot" of overhead, but a global hook DLL
does get injected into every running process, and can cause each application
to slow down if the hook is not performing efficient operations.
Is there any way to code it up so it only gets loaded with
selected apps
You would need to code the DLL's DllEntryPoint() function to dynamically
determine the application that is currently loading it, and then return
FALSE to cancel the loading if needed. You can use GetModuleFileName(),
specifying NULL as the module handle, to get the filename of the process
that is currently loading the DLL.
A less intrusion approach would be for your main application to monitor all
running processes, and then install thread-specific hooks for each desired
application when they start up. Enumerating the running processes will give
you the thread IDs of each process, and SetWindowsHookEx() can be used to
set up a single hook in a specific thread of an external application. Since
your main application, not the DLL, would be filtering the processe and
threads, the DLL would not be injected into unwanted applications, thus
reducing system resource usage.
Gambit
I mostly just want my mouse wheel to work with my creaky old borland |
5.02 compiler/ide, but I'd write the code with maybe cbuilder to do
it. I guess I'd write an app that I put in my startup menu that
monitors whenever bc5 is started and use setwindowshoodex like you
mentioned.
Thanks for the thoughts.
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