Dear List Members
I wish to set up for a MapInfo user a Mapbasic program to automatically
refresh the top map window. This program would periodically (say every
thirty seconds) wake up and execute a Window+AD4-Redraw Window menu operation
then go back to sleep.
Why? Because the top map window would contain a layer from a MapInfo table
on a file server that was being updated intermittently by another user, and
we're trying for near-real-time data display.
The retrieval user must retain control of MapInfo and be able to zoom and
pan the map except when the Redraw Window was happening.
The MapInfo Products Knowledge Base says
Question:
How can a sleep or wait function be implemented in MapBasic?
Answer:
Declare Sub Wait(byVal iSeconds as Integer)
Sub Wait(byVal iSeconds as Integer)
Dim iEnd as Integer
iEnd +AD0- Timer() +- iSeconds
Do while Timer() +ADw- iEnd
'whatever
Loop
End Sub
.. but that, of course, is no use in the present application, because the
Wait code never releases control of the Mapinfo Pro app, and the Mapinfo pro
user is totally locked out, looking at an Hourglass.
Q1. Is a solution possible in Mapbasic?
Q2. Is the only solution an external +ACI-DDE Client+ACI- program (written in,say,
VB, which has a proper timer control) that makes +ACI-System+ACI- topic calls to the
Mapinfo app with +ACI-execute menu command M+AF8-WINDOWREDRAW+ACI- as the message?
Regards
David M Haycraft
Information Analysis Associates Pty Ltd
ABN 47 085 516 105
1 Cumming Place, Wanniassa, 2903
Aust Capital Territory, Australia
Phone/Fax: 61 +- 2 +- 6231 8104
Mobile: 0412 001 134
Email: d.haycraft+AEA-acslink.aone.net.au
Web : www.acslink.aone.net.au/actaa/iaa.htm
A MapInfo Technology Partner
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