Thanks Shari. I wrote this solution a while back for this particular
app which is for elementary school teachers. The problem I'm
encountering is it seems no matter how simply and straight forward I
word the dialog which comes up when a second copy is launched, the
teacher's, especially beginners, just don't get it. Unfortunately,
with this method I've got to count on them to decide whether they
should continue or not, since they could have forced the first app to
quit (control-alt-delete) in which case it would be legitimate to
continue launching what appears to be a second copy of the app.
I'm going to try the two suggestions I've gotten from Ken Ray, one of
which will hopefully remove the end user from the decision making
process. I'll let you know how it works out, but thanks for your
alternate idea!
Ray Horsley
Developer, LinkIt! Software
On Jan 25, 2006, at 7:52 AM, Shari wrote:
Another way is to have your application either create a text file on
launch, or write something to it.
Then, anytime the app launches it looks for that text file, and if the
file exists or the wording inside of it say something specific, the
app is running.
On quit, either delete the file or write something else to it. The
key here is to catch any type of quit the user uses. If the program
doesn't go thru your quit routine, the file will not be changed on
quit, and will give a false positive on the next launch.
Mine has a text file that on launch, it opens the file for read, reads
from it etc. If the word Windows is in the text, my app is already
open. If it is opening for the first time, it writes something with
the word Windows to the file, signifying that the game has been
launched and is running. On quit, it writes something else to the
file.
Shari
--
Mac and Windows shareware games
http://www.gypsyware.com
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