'''zbar''' is a library for decoding barcode symbols. http://zbar.sourceforge.net/

[zbar] is provided as a package together with [Androwish]. In case someone wants to build [zbar] for Linux manually, [chw] provided the following instructions:

[chw] 2015-10-24: Should be possible with the latest check-in http://www.androwish.org/index.html/info/c82e1d09884d0458. I've tested manually building it on a CentOS6 system with these commands:

    $ gcc -fPIC -DUSE_TCL_STUBS=1 -DUSE_TK_STUBS=1 -DTCL_THREADS=1 -DPACKAGE=\"zbar\" -DPACKAGE_VERSION=\"0.10\" -c tclzbar.c
    $ gcc -shared -o libtclzbar.so tclzbar.o -lzbar -ltclstub8.5 -ltkstub8.5
    $ wish8.5
    % load ./libtclzbar.so Zbar

[dzach] 2015-10-25: To build [zbar] manually in a local directory, I brought the necessary files ''tclzbar.c'' and ''zbar.h'' in a the local dir, linked locally (can also be copied) as ''libzbar.so'' the ''/usr/lib/libzbar.so.0.2.0'' lib that was installed with '''zbarcam''' from Ubuntu's repositories, and used [chw]'s instructions above. For local compile/link, the linker command line should be:

    $ gcc -shared -o libtclzbar.so tclzbar.o -lzbar -ltclstub8.5 -ltkstub8.5 -L/full/path/to/local/dir

If you don't want/know to mess with the environment settings, you may need to change the line:

    #include <zbar.h>

in ''tclzbar.c'' to:

    #include "zbar.h"

so that the file is looked up locally.

To use it as a TCL package, create a file ''pkgIndex.tcl'' with the following contents:

    package ifneeded zbar 0.10 \
        [list load [file join $dir libtclzbar[info sharedlibextension]] Zbar]

To use [zbar], take a photo of a barcode from an item, e.g. food package, name it barcode_test.jpg, and then enter:

    $ package require zbar
    0.10
    $ package req img::jpeg
    1.4.4
    $ image create photo test_img -file barcode_test.jpg
    test_img
    $ zbar::decode test_img
    81 EAN13 2220063011920 ; # this is the result: milliseconds, symbol type, barcode

Documentation for the [zbar] tcl package, [http://www.androwish.org/index.html/wiki?name=zbar+command%|%here%|%]

<<categories>>Image Processing