Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ukma!gatech!hubcap!morourk
From: morourk@hubcap.UUCP (michael orourke)
Newsgroups: comp.sys.mac.programmer
Subject: Re: VBL Tasks
Message-ID: <4418@hubcap.UUCP>
Date: 14 Feb 89 01:01:02 GMT
References: <4398@hubcap.UUCP> <99000007@silver>
Organization: Clemson University, Clemson, SC
Lines: 23

In article <99000007@silver>, sl161022@silver.bacs.indiana.edu writes:
> 
> "VInstall and i understand about setting up a VBLTask record.  However, what
> "if the procedure I install needs to be called only when a certain key combo
> "is hit? Does it have to scan the event queue or something?
> 
> "I want it running all the time in the background.
> 
> Actually, another way to do this (and the way I use to do a similar thing)
> is to install a patch for _GetOSEvent, which is called quite frequently.
> In fact, whenever the Finder, the running application, or any DA is ready
> to respond to an event, it will call either _GetNextEvent (which goes
> through the Toolbox Event Manager) or _GetOSEvent (which goes directly
> through the Operating System.)  Since _GetNextEvent calls _GetOSEvent,
> you can patch _GetOSEvent and you'll be essentially guaranteed access
> to any keypress, and you can then do whatever you want.

Sounds great. Only one problem. There followed after this response a lot of
assembly language code examples. But I don't know assembly language so I couldntmake heads or tail of what to do.

How do I install a patch to a routine like GetOSEvent?

Michael O'Rourke