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Frequently Asked Questions (FAQ)
================================
This is the ever-growing list of answers to commonly asked questions. Please
feel free to post you question in our `iPhone Developers forum`_ if you do not
find the information you need in this documentation.
.. _`iPhone Developers Forum`:
http://sourceforge.net/projects/zbar/forums/forum/1072195
General
-------
This looks great... Where can I get it?
You can download the latest version of the SDK from
http://zbar.sf.net/iphone
Compatibility
-------------
Which iPhone devices does this library support?
The library works *only* with iOS devices that have an auto-focus camera.
Currently, the iPhone 3GS, iPhone 4 and newer devices. The iPad 2 and iPad
3 will also work in many cases, *iff* the barcode is printed large enough
to achieve good focus.
Will you make it work with the iPhone 3G?
*No* - the 3G it is not supported and is unlikely to ever be supported.
To be fair, you *can* use the 3G to scan image files, as long as they're in
focus (ie, *not* images taken by the built-in fixed-focus camera). There
is at least one application that found a use for this...
What target iOS versions does this library work with?
iOS 4, 5 and 6 are fully supported, including the latest video streaming
interfaces. Since Apple has dropped support for earlier versions of iOS on
the App Store, we recommend that you target only iOS 4 and later for reading
barcodes.
Note that iOS 3.1 is no longer supported; if you really think you need
that, you should still be able to get it working... See :doc:`compat` for
details about iOS version fallbacks.
In all cases you should use the latest SDK to build.
Are any private APIs in use?
No - the binary release of the SDK does not use any private APIs.
Does this support "automatic" barcode capture?
Yes - with recent iOS versions, the default configuration will capture
barcodes automatically from the video stream.
Building
--------
I get "Undefined symbols" errors when I try to build?
Most likely you did not add all of the necessary framework dependencies.
See :doc:`tutorial` or :doc:`install` for the list of frameworks you need
to link against.
Licensing
---------
Please refer to :doc:`licensing` for questions about licensing.
Barcodes
--------
Why do my UPC barcodes have an extra 0 at the front?
The UPC-A_ symbology is the subset of EAN-13_ that starts with a leading 0.
The ZBar decoder enables only EAN-13_ by default, so GTIN-13_ product codes
are consistently reported. You can choose to receive the 12-digit results
instead by explicitly enabling UPC-A_.
The :member:`~ZBarSymbol::type` property of the symbol can be used to see
which type of barcode is reported.
See EAN-13_ and UPC-A_ for more information.
Why does my UPC-E (short version) barcode data look completely wrong?
UPC-E_ is a "zero compressed" version of UPC-A_; certain of the zeros are
removed from the UPC-A_ data to generate the UPC-E_ barcode. The ZBar
decoder *expands* this compression by default, again to consistently report
GTIN-13_ product codes. You can choose to receive the compressed 8-digit
results instead by explicitly enabling UPC-E_.
The :member:`~ZBarSymbol::type` property of the symbol can be used to see
which type of barcode is reported.
See UPC-E_ for more information.
.. _GTIN-13:
.. _GTIN: http://wikipedia.org/wiki/GTIN
.. _EAN-13: http://wikipedia.org/wiki/EAN-13
.. _UPC-A: http://wikipedia.org/wiki/UPC-A
.. _UPC-E: http://wikipedia.org/wiki/UPC-E#UPC-E
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