table of contents
| ZBar::Processor(3pm) | User Contributed Perl Documentation | ZBar::Processor(3pm) |
NAME¶
Barcode::ZBar::Processor - self-contained bar code reader
SYNOPSIS¶
setup:
use Barcode::ZBar;
my $reader = Barcode::ZBar::Processor->new();
$reader->init("/dev/video1", 1);
$reader->parse_config('code39.disable');
$reader->set_data_handler(\&my_handler);
scan an image:
$reader->process_image($image);
scan from video:
$reader->set_visible();
$reader->set_active();
$reader->user_wait();
DESCRIPTION¶
A Barcode::ZBar::Processor may be used to quickly create stand-alone bar code scanning applications. It has interfaces to scan images or video and to optionally display a video/image preview to a window.
This interface is not well suited for integration with an existing GUI, as the library manages the optional preview window and any user interaction. Use a Barcode::ZBar::ImageScanner or Investigate the available widget interfaces for GUI applications.
REFERENCE¶
Methods¶
- new()
- Create a new bar code reader instance.
- init([video_device], [enable_display])
- Open a video input device and/or prepare to display output.
- set_data_handler([handler], [closure])
- Setup a callback to process results whenever new results are available from the video stream or a static image. The specified callable will be invoked with the associated Barcode::ZBar::Processor object and closure as arguments. Closure may be achieved either using standard Perl closure or by manually passing a scalar via closure.
- is_visible()
- set_visible([visible])
- Test/set visibility of the output window.
- set_active([active])
- Enable/disable video streaming and scanning for bar codes.
- get_results()
- Return a list of Barcode::ZBar::Symbol results from the last scanned image or video frame.
- user_wait([timeout])
- Wait for the user to press a key/button or close the window. Bar codes will continue to be processed if video is active.
- process_one([timeout])
- Enable video and scan until at least one barcode is found. Note that multiple results may still be returned.
- process_image([image])
- Scan a Barcode::ZBar::Image for bar codes.
- parse_config(configstr)
- Apply a decoder configuration setting. See the documentation for "zbarcam"/"zbarimg" for available configuration options.
- request_size(width, height)
- Request a preferred size for the video image from the device. The request may be adjusted or completely ignored by the driver. Must be called before "init()"
SEE ALSO¶
Barcode::ZBar, Barcode::ZBar::Image, Barcode::ZBar::ImageScanner
AUTHOR¶
Jeff Brown, <spadix@users.sourceforge.net>
COPYRIGHT AND LICENSE¶
Copyright 2008-2010 (c) Jeff Brown <spadix@users.sourceforge.net>
The ZBar Bar Code Reader is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
| 2021-02-13 | perl v5.32.1 |