John: I have several different apps that do this sort of thing. One runs
as a service on a server.
Here is the main program of the project:
* turn off NT login services
=SYS(2340, 1)
*normal setup stuff
DO SetEnv
ON ERROR DO errhand WITH ;
ERROR( ), MESSAGE( ), MESSAGE(1), PROGRAM( ), LINENO( )
LOCAL o
o = NEWOBJECT('cServer', 'Server.vcx')
READ EVENTS
o = .null.
CLOSE ALL
CLEAR ALL
RELEASE ALL
QUIT
cServer is a container with a timer on it. The timer fires when you want it
and your processing goes in the timer event. If the file is present you
disable the timer - do your processing - then re-enable the timer.
I also log processing to a log file so I can check on it while it runs.
HTH
Jeff Johnson
[EMAIL PROTECTED]
623-582-0323
Fax 623-869-0675
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of John Weller
Sent: Monday, December 18, 2006 3:43 PM
To: [EMAIL PROTECTED]
Subject: Polling App
Hi Guys,
I have to write a small utility that will check for the presence of a file
or files in a particular folder every 5 minutes or so. If any are there it
does some processing on them. It will probably run on the server. As I see
it there are two ways I can go:
1. Have a program that runs every 5 minutes triggered by scheduler.
Snag
arises if the processing takes more than 5 minutes (which could possibly
happen in the future).
2. Run the program continuously in a loop which will process the files
then
go to sleep for 5 minutes (using the API Sleep function). Question - will
this absorb much in the way of resources? I've found the Fox to be very
fast but a resource hog.
Any comments or suggestions of a better way will be gratefully received - I
see no benefit in re-inventing the wheel if someone has already tried
something similar.
TIA
John Weller
01380 723235
07976 393631
[excessive quoting removed by server]
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