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+--- Thread: Check FileExistance in Hepax (/thread-1118.html)
Check FileExistance in Hepax - sugarfox - 04-19-2014 11:37 AM
Hi!
I wrote a new survey package on the 41 (go41cx emulator) and used the hepax system. I integrated a littel Point Management which is based on a file for each Point. The PointNumbers are represented by the filenames and inside I store x/y.
So I have functions for set, get list and delete pointinformation.
But I need a function to check if a point (i.e. a file) exists or not, to avoid errors when I call Pointinformation in my cogo-programs.
Any Suggestions?
Best,
Johannes
PS: If someone is interested, I will post the Manual here, hepax file and manual were sent to Mr. Farlow too.
RE: Check FileExistance in Hepax - Raymond Del Tondo - 04-19-2014 01:40 PM
Hi,
at least the X-Memory file management functions have some kind of error feedback in case a wanted file doesn't exist. Maybe the HEPAX functions offer a similar feedback? If yes, you could simply create an error trap (SF 25) before a file selection, and handle it depending on the result (FS? 25 XEQ ErrHandler).
RE: Check FileExistance in Hepax - sugarfox - 04-19-2014 01:49 PM
(04-19-2014 01:40 PM)Raymond Del Tondo Wrote: Hi,
at least the X-Memory file management functions have some kind of error feedback in case a wanted file doesn't exist. Maybe the HEPAX functions offer a similar feedback? If yes, you could simply create an error trap (SF 25) before a file selection, and handle it depending on the result (FS? 25 XEQ ErrHandler).
Hi Ray!
I think thats it! I didnt write hp41 code since 25 years and didnt remember this possibility! Yes there is a error given back. I'll try it in time!
Thank you very much !
Best,
Johannes
RE: Check FileExistance in Hepax - Raymond Del Tondo - 04-19-2014 11:43 PM
Hi Johannes,
glad I could help:-)
But since I also don't program the HP-41 every day, my description contained a small error. It should read: SF 25 Stmt_to_trap FC? 25 XEQ ErrHandler, because an error condition will clear flag 25.
Cheers
RE: Check FileExistance in Hepax - sugarfox - 04-29-2014 10:25 PM
Hi Raymond,
thanks again for the hint, everything runs very good!
Best,
Johannes
(04-19-2014 11:43 PM)Raymond Del Tondo Wrote: Hi Johannes,
glad I could help:-)
But since I also don't program the HP-41 every day, my description contained a small error. It should read: SF 25 Stmt_to_trap FC? 25 XEQ ErrHandler, because an error condition will clear flag 25.
Cheers