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<!DOCTYPE HTML>
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<title>QRCodeReader (ZXing 3.5.4 API)</title>
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<p>Summary:</p>
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<div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">com.google.zxing.qrcode</a></div>
<h1 title="Class QRCodeReader" class="title">Class QRCodeReader</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">com.google.zxing.qrcode.QRCodeReader</div>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Implemented Interfaces:</dt>
<dd><code><a href="../Reader.html" title="interface in com.google.zxing">Reader</a></code></dd>
</dl>
<dl class="notes">
<dt>Direct Known Subclasses:</dt>
<dd><code><a href="../multi/qrcode/QRCodeMultiReader.html" title="class in com.google.zxing.multi.qrcode">QRCodeMultiReader</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">QRCodeReader</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>
implements <a href="../Reader.html" title="interface in com.google.zxing">Reader</a></span></div>
<div class="block">This implementation can detect and decode QR Codes in an image.</div>
<dl class="notes">
<dt>Author:</dt>
<dd>Sean Owen</dd>
</dl>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<li>
<section class="constructor-summary" id="constructor-summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">QRCodeReader</a>()</code></div>
<div class="col-last even-row-color"> </div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
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<div class="summary-table three-column-summary">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../Result.html" title="class in com.google.zxing">Result</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#decode(com.google.zxing.BinaryBitmap)" class="member-name-link">decode</a><wbr>(<a href="../BinaryBitmap.html" title="class in com.google.zxing">BinaryBitmap</a> image)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Locates and decodes a QR code in an image.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>final <a href="../Result.html" title="class in com.google.zxing">Result</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#decode(com.google.zxing.BinaryBitmap,java.util.Map)" class="member-name-link">decode</a><wbr>(<a href="../BinaryBitmap.html" title="class in com.google.zxing">BinaryBitmap</a> image,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a><<a href="../DecodeHintType.html" title="enum in com.google.zxing">DecodeHintType</a>,<wbr>?> hints)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Locates and decodes a barcode in some format within an image.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>protected final <a href="decoder/Decoder.html" title="class in com.google.zxing.qrcode.decoder">Decoder</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getDecoder()" class="member-name-link">getDecoder</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#reset()" class="member-name-link">reset</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Resets any internal state the implementation has after a decode, to prepare it
for reuse.</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone--" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#equals-java.lang.Object-" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#finalize--" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#toString--" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-" title="class or interface in java.lang" class="external-link">wait</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor-detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="<init>()">
<h3>QRCodeReader</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="element-name">QRCodeReader</span>()</div>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="getDecoder()">
<h3>getDecoder</h3>
<div class="member-signature"><span class="modifiers">protected final</span> <span class="return-type"><a href="decoder/Decoder.html" title="class in com.google.zxing.qrcode.decoder">Decoder</a></span> <span class="element-name">getDecoder</span>()</div>
</section>
</li>
<li>
<section class="detail" id="decode(com.google.zxing.BinaryBitmap)">
<h3>decode</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="../Result.html" title="class in com.google.zxing">Result</a></span> <span class="element-name">decode</span><wbr><span class="parameters">(<a href="../BinaryBitmap.html" title="class in com.google.zxing">BinaryBitmap</a> image)</span>
throws <span class="exceptions"><a href="../NotFoundException.html" title="class in com.google.zxing">NotFoundException</a>,
<a href="../ChecksumException.html" title="class in com.google.zxing">ChecksumException</a>,
<a href="../FormatException.html" title="class in com.google.zxing">FormatException</a></span></div>
<div class="block">Locates and decodes a QR code in an image.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../Reader.html#decode(com.google.zxing.BinaryBitmap)">decode</a></code> in interface <code><a href="../Reader.html" title="interface in com.google.zxing">Reader</a></code></dd>
<dt>Parameters:</dt>
<dd><code>image</code> - image of barcode to decode</dd>
<dt>Returns:</dt>
<dd>a String representing the content encoded by the QR code</dd>
<dt>Throws:</dt>
<dd><code><a href="../NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></code> - if a QR code cannot be found</dd>
<dd><code><a href="../FormatException.html" title="class in com.google.zxing">FormatException</a></code> - if a QR code cannot be decoded</dd>
<dd><code><a href="../ChecksumException.html" title="class in com.google.zxing">ChecksumException</a></code> - if error correction fails</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="decode(com.google.zxing.BinaryBitmap,java.util.Map)">
<h3>decode</h3>
<div class="member-signature"><span class="modifiers">public final</span> <span class="return-type"><a href="../Result.html" title="class in com.google.zxing">Result</a></span> <span class="element-name">decode</span><wbr><span class="parameters">(<a href="../BinaryBitmap.html" title="class in com.google.zxing">BinaryBitmap</a> image,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a><<a href="../DecodeHintType.html" title="enum in com.google.zxing">DecodeHintType</a>,<wbr>?> hints)</span>
throws <span class="exceptions"><a href="../NotFoundException.html" title="class in com.google.zxing">NotFoundException</a>,
<a href="../ChecksumException.html" title="class in com.google.zxing">ChecksumException</a>,
<a href="../FormatException.html" title="class in com.google.zxing">FormatException</a></span></div>
<div class="block"><span class="description-from-type-label">Description copied from interface: <code><a href="../Reader.html#decode(com.google.zxing.BinaryBitmap,java.util.Map)">Reader</a></code></span></div>
<div class="block">Locates and decodes a barcode in some format within an image. This method also accepts
hints, each possibly associated to some data, which may help the implementation decode.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../Reader.html#decode(com.google.zxing.BinaryBitmap,java.util.Map)">decode</a></code> in interface <code><a href="../Reader.html" title="interface in com.google.zxing">Reader</a></code></dd>
<dt>Parameters:</dt>
<dd><code>image</code> - image of barcode to decode</dd>
<dd><code>hints</code> - passed as a <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html" title="class or interface in java.util" class="external-link"><code>Map</code></a> from <a href="../DecodeHintType.html" title="enum in com.google.zxing"><code>DecodeHintType</code></a>
to arbitrary data. The
meaning of the data depends upon the hint type. The implementation may or may not do
anything with these hints.</dd>
<dt>Returns:</dt>
<dd>String which the barcode encodes</dd>
<dt>Throws:</dt>
<dd><code><a href="../NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></code> - if no potential barcode is found</dd>
<dd><code><a href="../ChecksumException.html" title="class in com.google.zxing">ChecksumException</a></code> - if a potential barcode is found but does not pass its checksum</dd>
<dd><code><a href="../FormatException.html" title="class in com.google.zxing">FormatException</a></code> - if a potential barcode is found but format is invalid</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="reset()">
<h3>reset</h3>
<div class="member-signature"><span class="modifiers">public</span> <span class="return-type">void</span> <span class="element-name">reset</span>()</div>
<div class="block"><span class="description-from-type-label">Description copied from interface: <code><a href="../Reader.html#reset()">Reader</a></code></span></div>
<div class="block">Resets any internal state the implementation has after a decode, to prepare it
for reuse.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="../Reader.html#reset()">reset</a></code> in interface <code><a href="../Reader.html" title="interface in com.google.zxing">Reader</a></code></dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
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