jed1@ra.MsState.Edu (Joseph E. Dunston) (02/14/91)
I have a strange problem with tp 6.0 , here is a piece of code: Reset (datafile1); Rewrite(datafile2); While not eof(datafile1) do While not eoln(datafile2) do begin ........ We gat a file not found error if the code is left as stands. If we comment out the not in both of the while statements, no error. What gives ??????? Any suggestions welcome. Joseph jed1@ra.msstate.edu
John G. Spragge <SPRAGGEJ@QUCDN.QueensU.CA> (02/14/91)
Reference the person who tried to take the EOLN of a file that was just rewritten: When you RESET a file, the pointer is set to the beginning, like so: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.... ^ An EOLN on this file says "get the current character in the file buffer. If it is a 13 (carriage return) return true, otherwise, false. When you REWRITE a file, all characters at and after the file pointer are undefined. Since the pointer is always (barring a SEEK) at the end of a reset file, EOF is always true, and EOLN is undefined. I assume the support routines detected this situation and bounced you. disclaimer: Queen's University supplies me with computer services, not my opinions. John G. Spragge
ts@uwasa.fi (Timo Salmi) (02/15/91)
In article <jed1.666500501@ra> jed1@ra.MsState.Edu (Joseph E. Dunston) writes: >I have a strange problem with tp 6.0 , here is a piece of code: > >Reset (datafile1); >Rewrite(datafile2); > >While not eof(datafile1) do > While not eoln(datafile2) do > begin > ........ > >We gat a file not found error if the code is left as stands. If we comment >out the not in both of the while statements, no error. >What gives ??????? Well, aren't eof and eoln true by default whenever we are not specifically in the middle of an _existing_ file or a line. And have you first checked for the existence of datefile1. And why an eoln in the context of a file that is being written to? I don't quite see the logic. What kind of files are these supposed to be? Text probably? You may find your answer by considering these points and questions. ................................................................... Prof. Timo Salmi Moderating at garbo.uwasa.fi anonymous ftp archives 128.214.12.37 School of Business Studies, University of Vaasa, SF-65101, Finland Internet: ts@chyde.uwasa.fi Funet: gado::salmi Bitnet: salmi@finfun
ebergman@isis.cs.du.edu (Eric Bergman-Terrell) (02/17/91)
Forgive me if I'm being obvious, but you did call the "assign" procedure prior to the calls to reset and rewrite, right? If not, you should (read the manual). Having to use the assign procedure is a nonstandard feature of Turbo... Terrell