On Tue, 19 Jul 2005 12:24:47 -0700
Trevor DeVore <[EMAIL PROTECTED]> wrote:
On Jul 19, 2005, at 11:35 AM, Matthew wrote:
There is another way to check if an instance is running
that will
work on all OS. When you start the program you create a
file if it
is not already there. If it is there then you close the
program.
I hope this helps.
Unfortunately you will run into problems if your
application crashes. The file will stay around and when
you try to launch your app again it thinks it is already
running. You can come up with schemes to work around
this but using a mutex is much more reliable and easier
on Windows. On Mac you don't have to worry about
multiple instances for each user. I don't do any Linux
development right now so I can't comment on that.
The file method would work better if Revolution would
allow you to get a lock on a file so that nobody else
can access it. I didn't see a way to do this with open
file. If this were the case then I think you could open
the file and lock anybody else out from reading it.
Then if another instance of your app launched and
tried to open the file an error would be returned. If
the app crashed then I think the lock on the file would
be released.
I don't think that there is a way to lock a file in
revolution but I thought of another solution. Every
half-second or so you could put the current date and time.
Then when you open it up again it would check and see if
it was very recent and if it was it can wait about a
second and do the same check again. Of cource if you were
using a long repeat loop you would have problems but you
could always figure out a different way to do the loop.
Sincerely, Matt
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