cfloop over a file - set start point?

Forum|Forum|17 years ago
August 28, 2008
3 replies
555 views

CF8 - I'm using cfloop to read a file, as described in the documentation:

<cfloop
index = "index name"
file = "absolute path and filename">
</cfloop>

It's a text file; is there a way to define lines? Like start reading at line 4000?

Thanks if anyone knows!

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Correct answer phamm

I think I found the answer here.

http://coldfused.blogspot.com/2007/07/new-file-io-in-coldfusion-8.html

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-__cfSearching__-

Inspiring

Both techniques would work. I have not done much work with the new file objects. But the difference seems to be whether the entire file is read into memory at once or only portions of it. For large files, the technique in the blog entry would be a better fit. Because it works with smaller chunks of information. I do not know if it makes a difference with smaller files.

From: http://coldfused.blogspot.com/2007/07/new-file-io-in-coldfusion-8.html
With cfloop, you can also iterate over a part of the file by specifying "from" and "to" values. Here is an example to loop over lines between 10 and 20.
<cfloop file="c:\temp\myfile.txt" index="line" from=10 to=20>
<cfoutput>#line#</cfoutput> 
</cfloop>

P

phammAuthor

Inspiring

Thanks all!!!!

Since I am dealing with large files (500K+lines), I'm going to use the "from=" option. It's frustrating that this option is not in the Cold Fusion 8 "cfloop" documentation, particularly since better file handling in cfloop is one of the major new features in cf8! I wonder how many other undocumented features are out there for cold fusion? Is this the tip of the iceberg?

D

Dan_Bracuk

Inspiring

I didn't read your link, but my method would be to treat the file as a list separated by chr(10) & chr(13).

P

phammAuthorCorrect answer

Inspiring

I think I found the answer here.

http://coldfused.blogspot.com/2007/07/new-file-io-in-coldfusion-8.html