multiple instances of standalone under Windows

[Richard Gaskin]

Trevor DeVore wrote:

> On Jan 29, 2004, at 2:08 PM, Richard Gaskin wrote:
> 
>> Chipp Walters wrote:
>> 
>>> We've had some discussions on this list before, and the short answer
>>> is "not
>>> easily." You can do things like write a file when you open and delete
>>> it
>>> when you close --then check to see if it is there when it launches
>>> again,
>>> but this has obvious problems.
>> 
>> Polling a directory for a file, while suboptimal, is pretty fast and
>> would
>> seem to get the job done, no?
> 
> Could you run into problems if your app crashed and wasn't able to
> clean up after itself?  The next time your app launched the file would
> still be there and your app would shut itself down.

I had thathappen with a CGI.  I changed it so the file contains a timestamp;
if more than 10 seconds old it deletes it and moves on.

With desktop apps its more complicated, since the length of a session is
less predictable.

Could a local UDP or TCP call be used for that instead?

-- 
 Richard Gaskin 
 Fourth World Media Corporation
 Developer of WebMerge: Publish any database on any Web site
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