Dear List Members: I wish to establish the feasibility (or otherwise) of setting up a pure-MapInfo near-real-time mapping information system. In this system a single MapInfo Pro user would be editing a MapInfo table held on a LAN file server and several other MapInfo Pro users would periodically retrieve this table on their own desktops. The data entry user would be adding, deleting and modifying Symbol objects and associated alphanumeric attributes with the Symbol and Info tools and periodically executing File+AD4-Save Table to save the edits. The retrieval users would periodically execute +ACI-Window+AD4-Redraw Window+ACI- to refresh their maps and view the latest data. Now the MapInfo Pro 5.5. Reference Guide (Changing Table Info p 187) implies that this limited form of data sharing is supported for Mapinfo tables: +ACI-If you are working in a network environment, note that only one user can edit a Mapinfo table at a time. An editing session begins when the first edit is made and ends when a Save or Revert is performed. Other uses can view the table while editing is in progress+ADs- the edits will not be visible until the edits are saved+ACI-. However, when I try to test data sharing on a three-PC network (edit user, retrieval user, file server) with a MapInfo table called realtime.tab, it works ok for a few edits then, at File+AD4-Save time, the data entry PC puts up the diagnostic: MapInfo: Cannot access file realtime.ID for writing. Please be sure that this file is not open in another application. Retry/Cancel. Clicking Retry simply brings up the same error again. Clicking Cancel and losing the last edit doesn't help either. As soon as another File+AD4-Save is tried the same diagnostic reappears. Closing the retrieval user's copy of MapInfo does not clear the error. No further data entry is possible until the data entry copy of MapInfo is dropped and then restarted. Evidently the File+AD4-Save operation is +ACI-colliding+ACI- with the Window+AD4-Redraw Window operation, and failing to reset its own file lock to enable a retry. I'm using MapInfo Pro 5.5 for both edit and retrieval. The test network has Windows/NETBEUI File Sharing, Windows /NT 4 on the file server and Windows 98 on the user workstations. Q1. Am I encountering a bug in MapInfo Pro 5.5? Q2. Has anybody ever used MapInfo Pro reliably in the data sharing mode proposed, namely one edit user plus several retrieval users? David M Haycraft Information Analysis Associates Pty Ltd ABN 47 085 516 105 1 Cumming Place, Wanniassa, 2903 AST 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 ---------------------------------------------------------------------- To unsubscribe from this list, send e-mail to [EMAIL PROTECTED] and put "unsubscribe MAPINFO-L" in the message body, or contact [EMAIL PROTECTED]
