haverlan@tramp.colorado.edu (HAVERLAND MARC BRADLEY) (01/28/91)
I'm looking for a utility that will ease the task of converting a large Clipper Summer '87 application to a network version. It seems like a process that could be automated, but I haven't seen anything like this. Any leads you could provide would be great. A couple other related questions: The application in question is broken into many overlays. My client is getting a Lantastic network. Any known problems with this? Does Clipper 5.0 leave more memory available in general? I'm currently having out of memory problems, and it will get worse with the addition of a network driver. Thanks for any input, Marc Haverland haverlan@tramp.colorado.edu 303-650-1100
tleylan@pegasus.com (Tom Leylan) (01/29/91)
In article <1991Jan28.005022.9930@csn.org> haverlan@tramp.colorado.edu (HAVERLAND MARC BRADLEY) writes: > >I'm looking for a utility that will ease the task of converting a large >Clipper Summer '87 application to a network version. It seems like a >process that could be automated, but I haven't seen anything like this. >Any leads you could provide would be great. > >A couple other related questions: > >The application in question is broken into many overlays. My client is >getting a Lantastic network. Any known problems with this? > >Does Clipper 5.0 leave more memory available in general? I'm currently >having out of memory problems, and it will get worse with the addition >of a network driver. Marc, There is at least one product that claims to convert dBASE code from single user to multi-user but I won't even mention it because it would probably do you more harm than good. The problems are not trivial as records should be locked for as little time as possible but not so little that integrity problems creep in. First move is to SET EXCLUSIVE OFF and Clipper will require you to handle the RLOCK() and FLOCK() situations or you'll be given a fatal error. More than the physical mods are required however. Logical mods may be called for to avoid deadlock situations (the conversion software wouldn't detect this). Lantastic has no known problems with Clipper. Clipper 5.0 eliminates memory problems altogether. Currently there are some bugs with the VMM system but they will be fixed. Even with the bugs one can now create (for example) a 10MB array in 640K of RAM. The virtual memory manager will use expanded memory if it is available and then the disk drive to store it totally transparent to the developer. Dynamic overlaying linkers will control the code size and you can use BLINKER or WARPLINK for Clipper S'87. From a code standpoint you should not run out of memory though with S'87 you can still run out of memory for data. Hope that does it... tom leylan ex-Senior Systems Analyst / Nantucket Corp.
mpd@anomaly.SBS.COM (Michael P. Deignan) (01/30/91)
haverlan@tramp.colorado.edu (HAVERLAND MARC BRADLEY) writes: >I'm looking for a utility that will ease the task of converting a large >Clipper Summer '87 application to a network version. It seems like a >process that could be automated, but I haven't seen anything like this. >Any leads you could provide would be great. I don't know of one, but it is rather easy to convert. Basically, it amounts to little more than placing RLOCK/FLOCK statements in their appropiate places. >Does Clipper 5.0 leave more memory available in general? I'm currently >having out of memory problems, and it will get worse with the addition >of a network driver. I have a similar application; it got worse with 5.0. MD -- -- Michael P. Deignan / They're not "bombs". -- Domain: mpd@anomaly.sbs.com / They're "gifts". -- UUCP: ...!uunet!rayssd!anomaly!mpd / "Gifts From Above". -- Telebit: +1 401 455 0347 /
FelineGrace@cup.portal.com (Dana B Bourgeois) (02/02/91)
I am setting up an Ethernet network that uses TCP/IP and PC-NFS with a Sun SPARC II for a server. Anybody know if Clipper will properly handle shared files on the server when network drives are mounted with Sun's PC-NFS? When I called Clipper, the support guy said that there may be a bug that gives a net-error when reading files over the net. It is kinda important to me to know if this is true. I don't want to tell people they should be able to network their applications then find they can't because Clipper has a bug (this is 5.0 by the way). Anybody have experience with Clipper over this type of network? Dana Bourgeois @ cup.portal.com