[Xnee-devel] [slightly off-topic] preventing a client from receiving an event

[Daniel Jácome Costa]

Hello,

My name is Daniel Costa, I live in Lisbon, Portugal, and since I readed the 
article about Xnee in issue 117 of Linux Journal, I've been happily using 
Xnee for automating a number of tasks, and I think it's a great application 
and very useful, so let me start by thanking all the developers for writing 
it.

Expressing my appreciation is not the only reason I'm posting to the list, 
although it certainly should be motive enough :-)
I need some help from you experienced X developers to point me in the right 
direction

Let me explain:
although where I work we are running mostly linux now, I have an old legacy 
accounting/inventory MSDOS (horrors) application that I need to support, and 
so far have been able to, using dosemu the app runs great, and everybody is 
happy

or should I say, almost happy, because as it happens, the DOS app is buggy, 
and there is a certain sequence of keystrokes that causes it to crash (that I 
was able to determine thanks to xnee)

now what I am trying to do is this:
write a program that monitors the keyboard events sent to the dosemu window, 
and prevents the deadly key sequence from reaching it

I have some experience in X programming, mainly Tcl/Tk, Perl/Tk, C/gtk and 
lately C++/Qt, but have never done something as low-level (Xlib frightens 
me), and so I am a bit clueless as how to begin

I ask you: can this be done with slight modifications to xnee? 
that is plan A, and I've started reading the code, but I haven't seen 
anything in the RECORD extension that allows me to snatch events from the 
queue, preventing them from reaching the client

plan B is to read the code from some window manager (fvwm, kwm, etc) to learn 
how do they do it 

well, there you have it, any suggestion is very welcome

thanks in advance,
best regards,
daniel


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