Solved

Detecting an ASCII text file

Posted on 1997-11-20
2
166 Views
Last Modified: 2010-04-04
Is there any way to detect that a file that Delphi has opened for input and is reading, is an ASCII text file? In other words, if the user tries to open a ZIP file or a binary executable file, is there a way to detect that this file is not ASCII and flash an error?
  I know you can set file masks and all that in the Open Dialog box, but is there a way I can check the input files content programmatically and sound an alarm if it's not readable ASCII text?

Thanks,
  Shawn Halfpenny
  drumme59@sprint.ca
0
Comment
Question by:aztec
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
2 Comments
 
LVL 7

Accepted Solution

by:
ahalya earned 50 total points
ID: 1351325
yes. if you're willing to open the file and examine it yourself.

open the file and as file of byte
repeat
 read(nextbyte)
 binary := ((nextbyte) > 126 or (nextbyte) > 32)
until binary or eof(file)

0
 
LVL 7

Expert Comment

by:ahalya
ID: 1351326
Well, what about tabs, CR-s, LF-s, EOF, etc?

Also this code is a bit slow, some buffering would be better.
Or memory mapped files if win32 is used.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
This video shows how to use Hyena, from SystemTools Software, to update 100 user accounts from an external text file. View in 1080p for best video quality.

732 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question