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Item1441: No way to open a handle on an attachment from Func

Priority: CurrentState: AppliesTo: Component: WaitingFor:
Enhancement Closed Engine    
This can be very important when you are working with very large attachments, where reading the entire attachment is just stupid. Two types of open are require, open-read and open-write (optional append). Solution:

openAttachment($web, $topic, $attachment, $mode) -> $fh

Opens the given attachment. The attachment must exist. The attachment will be locked for other changes as long as the file handle is open. Modes '>', '<' and '>>' should be supported.

Errors will be signalled by an Error::Simple exception.

Also:

testAttachment(web, topic, attachment, mode)

Performs a type test on the given attachment.
  • $test - the test to perform
  • $web, $topic $attachment
The return value is the value that would be returned by the standard perl file operations, as indicated by $type
  • r File is readable by current user (tests Foswiki permissions, not file permissions)
  • w File is writable by current user (tests Foswiki permissions, not file permissions)
  • e File exists.
  • z File has zero size.
  • s File has nonzero size (returns size).
  • T File is an ASCII text file (heuristic guess).
  • B File is a "binary" file (opposite of T).
  • M Last modification time (epoch seconds).
  • A Last access time (epoch seconds).
Note that all these types should behave as the equivalent standard perl operator behaves, except M and A which are independent of the script start time (see perldoc -f -X for more information)

See WhatTheFunc
Ended up adding openAttachment and testAttachment to Foswiki::Meta but not Foswiki::Func. Meta is published, and the function site better there anyway. Persuaded by Sven to use a mode parameter rather than having two functions.

-- CrawfordCurrie - 15 Apr 2009

ItemTemplate edit

Summary No way to open a handle on an attachment from Func
ReportedBy CrawfordCurrie
Codebase
SVN Range SVN 3415: Foswiki-1.1.0-dev, Sun, 05 Apr 2009, build 3374
AppliesTo Engine
Component
Priority Enhancement
CurrentState Closed
WaitingFor
Checkins Foswikirev:3440 Foswikirev:3441 Foswikirev:3461
TargetRelease minor
ReleasedIn 1.1.0
Topic revision: r9 - 04 Oct 2010, KennethLavrsen
 
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