qzxing/README.md

# qzxing
Qt/QML wrapper library for the [ZXing](https://github.com/zxing/zxing) decoding library. 

Supports barcode decoding for the following types: 

 * UPC-A 	
 * UPC-E 	
 * EAN-8 	
 * EAN-13 	
 * ITF 	
 * Code 39 
 * Code 93 	
 * Code 128 	
 * Codabar 	
 * QR Code
 * Data Matrix
 * Aztec (beta)
 * PDF 417 (beta)

#How to include

The project can be used in two ways:
## Embed the source code. 
Copy source code folder of QZXing to the root of your project. Add the following line to your .pro file. For more information see [here](https://github.com/ftylitak/qzxing/wiki/Using-the-QZXing-through-the-source-code).
	
	include(QZXing/QZXing.pri)

## Compile the project as an external library
Open QZXing project (QZXing.pro) and compile. If it is needed to compile as static library, uncomment the following line in the .pro file.
	
	CONFIG += staticlib
	
## Control dependencies
Project file config tags are now introduced to be able to control the dependencies of the library accoring to the needs.
The core part requires only "core" and "gui" Qt modules. Though for backward compatibility "quick" Qt module is also required. 
The 3 level of dependencies are:

###QZXing with QML (default)
By including QZXing.pri or by building QZXing.pro, apart from the core functionality for C++ it will also include the QML functionality.

###QZXing (no QML, only core)
If an application is not going to use QML functionality, it is now possible to ditch the dependency to it. This can be done by adding the folloing line to the .pro file of its project:
	
	CONFIG -= qzxing_qml
	
###QZXing + QZXingFilter
QZXing includes QZXingFilter, a QAbstractVideoFilter implementation to provide a mean of providing live feed to the decoding library. 
This option requires "multimedia" Qt module this is why it is considered as a separate configuration. It can be used by adding the folloing line to the .pro file of a project:

	CONFIG += qzxing_multimedia
	
#How to use

Follows simple code snippets that brefly show the use of the library. For more details advise the examples included in the repository and the [wiki](https://github.com/ftylitak/qzxing/wiki).

##C++/Qt

	
	#include <QZXing.h>

	int main() 
	{
		QImage imageToDecode("file.png");
		QZXing decoder;
		decoder.setDecoder( DecoderFormat_QR_CODE | DecoderFormat_EAN_13 );
		QString result = decoder.decodeImage(imageToDecode);
	}
	
##QML

First register QZXing type to the QML engine.

	#include <QZXing.h>

	int main() 
	{
		...
		QZXing::registerQMLTypes();
		...
	}
	
The in the QML file 

	import QZXing 2.3

	function decode(preview) {
		imageToDecode.source = preview
		decoder.decodeImageQML(imageToDecode);
	}

	Image{
		id:imageToDecode
	}

	QZXing{
		id: decoder

		enabledDecoders: QZXing.DecoderFormat_QR_CODE

		onDecodingStarted: console.log("Decoding of image started...")

		onTagFound: console.log("Barcode data: " + tag)

		onDecodingFinished: console.log("Decoding finished " + (succeeded==true ? "successfully" :    "unsuccessfully") )
	}
 
# contact
In case of bug reports or feature requests feel free to open an [issue](https://github.com/ftylitak/qzxing/issues). 

For general discussion you can use the forum at the project's old hosting site: [SourceForge](https://sourceforge.net/p/qzxing/discussion/general/)