Thanks all... john
On 1/24/08, David Murray <[EMAIL PROTECTED]> wrote: > Hi all, > > UniVerse and SB+ also have this technique built in. > > UniVerse is via the OPEN.FILE.B in the APP.PROGS file (uv account) and SB+ > via the SB.FILEVAR.S subroutine. > > I had written an article regarding the UniVerse routines: > http://u2blog.org/2007/11/05/appprogs-open-tools/ > > Cheers, > > David Murray > > > .learn and do > .excel and share > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Scott Ballinger > Sent: Thursday, January 24, 2008 11:37 AM > To: u2-users@listserver.u2ug.org > Subject: Re: [U2] Universe 20.1 itype perf enhancer > > Hi John, > > As you surmised, this is not a new trick. Here is my version: > > SUBROUTINE OPEN.FILE.SUB(FILENAME,FILEVAR,ERROR) > * open filename to filevar, keep opened files in named common > * 01-20-01 asb > COMMON /OPEN.FILE.SUB/ FILENAMES,FILEVARS(1000) > IF ASSIGNED(FILENAMES) ELSE > FILENAMES = "" > END > ERROR = "" > LOCATE(FILENAME,FILENAMES;POS) THEN > FILEVAR = FILEVARS(POS) > END ELSE > OPEN FILENAME TO FILEVAR THEN > IF POS LE 1000 THEN > FILENAMES<POS> = FILENAME > FILEVARS(POS) = FILEVAR > END > END ELSE > FILEVAR = "" > ERROR = 1 > CRT @(0):"ERROR! can't open ":FILENAME:@(-4) > END > END > RETURN > > In use, you CALL OPEN.FILE.SUB("MYFILE",FILEVAR,ERR) ; IF ERR THEN .... > > Interestingly, on D3 this does not seem to have much benefit, where the OPEN > function seems faster than the LOCATE. > > /Scott Ballinger > Pareto Corporation > Edmonds WA USA > 206 713 6006 > > On Jan 24, 2008 6:56 AM, john reid <[EMAIL PROTECTED]> wrote: > > > I just saw this today, and although i am certain that everyone must > > know it already, i am including it. > > For itypes that call subroutines, where the subroutines open lots of > > files, put a named common in the subroutine that contains what amounts > > to dimensioned arrays that hold the file vars. Put a switch in so that > > the files are opened only once. > > Anecdotally, this appears to work more efficiently than not having the > > common. If there are reasons why this is ill-advised, I'd like to see > > that as well. > > thanks. > > John > > COMMON /SETUP.STUFF/MY.FILES(15),FIRST.IN.SWITCH > > -- > > john > > ------- > > u2-users mailing list > > u2-users@listserver.u2ug.org > > To unsubscribe please visit http://listserver.u2ug.org/ > ------- > u2-users mailing list > u2-users@listserver.u2ug.org > To unsubscribe please visit http://listserver.u2ug.org/ > ------- > u2-users mailing list > u2-users@listserver.u2ug.org > To unsubscribe please visit http://listserver.u2ug.org/ > -- john ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/
