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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
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  <title>QML Bluetooth Picture Push Example | Qt Bluetooth 5.7</title>
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<td >Qt 5.7</td><td ><a href="qtbluetooth-index.html">Qt Bluetooth</a></td><td >QML Bluetooth Picture Push Example</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.7.1 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#running-the-example">Running the Example</a></li>
<li class="level1"><a href="#device-discovery">Device Discovery</a></li>
<li class="level1"><a href="#file-selection">File Selection</a></li>
<li class="level1"><a href="#root-element">Root Element</a></li>
<li class="level1"><a href="#file-transfer">File Transfer</a></li>
</ul>
</div>
<div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">QML Bluetooth Picture Push Example</h1>
<span class="subtitle"></span>
<!-- $$$picturetransfer-description -->
<div class="descr"> <a name="details"></a>
<p>The Bluetooth Picture Push example shows how to use the <a href="qbluetoothtransfermanager.html">QBluetoothTransferManager</a> API. The example transfers a local image to a remote device. Unfortunately this example cannot be used on Android as Qt does not support the Object Push Profile (OPP) on this platform.</p>
<p>On the first user interface page the application scans for remote Bluetooth devices. The user must select the appropriate device to continue:</p>
<p class="centerAlign"><img src="images/opp-example-1.png" alt="" /></p><p>The next page presents a list of image files on the device. The files must be located under <a href="../qtcore/qstandardpaths.html#StandardLocation-enum">QStandardPaths::PicturesLocation</a>}:</p>
<p class="centerAlign"><img src="images/opp-example-2.png" alt="" /></p><p>Once the picture was selected the UI shows the progress of the file transfer:</p>
<p class="centerAlign"><img src="images/opp-example-3.png" alt="" /></p><a name="running-the-example"></a>
<h2 id="running-the-example">Running the Example</h2>
<p>To run the example from Qt Creator, open the <b>Welcome</b> mode and select the example from <b>Examples</b>. For more information, visit Building and Running an Example.</p>
<a name="device-discovery"></a>
<h2 id="device-discovery">Device Discovery</h2>
<p>The device discovery uses the <a href="qml-qtbluetooth-bluetoothdiscoverymodel.html">BluetoothDiscoveryModel</a> to detect the remote devices. Each discovery is displayed as an entry in a list. Once a device was selected the device address is stored in the <code>root</code> element. More details about the <code>root</code> element will follow further below.</p>
<pre class="qml">

      <span class="type">ListView</span> {
          <span class="name">model</span>: <span class="name">BluetoothDiscoveryModel</span> {
              <span class="name">discoveryMode</span>: <span class="name">BluetoothDiscoveryModel</span>.<span class="name">DeviceDiscovery</span>
              <span class="name">onErrorChanged</span>: {
                  <span class="keyword">if</span> (<span class="name">error</span> <span class="operator">==</span> <span class="name">BluetoothDiscoveryModel</span>.<span class="name">NoError</span>)
                      <span class="keyword">return</span>;
                  <span class="keyword">if</span> (<span class="name">error</span> <span class="operator">==</span> <span class="name">BluetoothDiscoveryModel</span>.<span class="name">PoweredOffError</span>)
                      <span class="name">titleLabel</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">&quot;Bluetooth turned off&quot;</span>;
                  <span class="keyword">else</span>
                      <span class="name">titleLabel</span>.<span class="name">text</span> <span class="operator">=</span> <span class="string">&quot;Cannot find devices&quot;</span>;
              }
          }

          <span class="name">delegate</span>: <span class="name">Button</span> {
              <span class="name">width</span>: <span class="name">listView</span>.<span class="name">width</span> <span class="operator">+</span> <span class="number">2</span>
              <span class="name">text</span>: <span class="name">model</span>.<span class="name">name</span>
              <span class="name">onClicked</span>: <span class="name">root</span>.<span class="name">remoteDevice</span> <span class="operator">=</span> <span class="name">model</span>.<span class="name">remoteAddress</span>
          }
      }

</pre>
<a name="file-selection"></a>
<h2 id="file-selection">File Selection</h2>
<p>The file is selected with the help of FolderListModel. Once again the selected file is stored in the <code>root</code> element:</p>
<pre class="qml">

          <span class="name">model</span>: <span class="name">FolderListModel</span> {
              <span class="name">folder</span>: <span class="string">&quot;file://&quot;</span><span class="operator">+</span><span class="name">SystemPictureFolder</span>
              <span class="name">showDirs</span>: <span class="number">false</span>
          }

          <span class="name">delegate</span>: <span class="name">Rectangle</span> {
              <span class="type">Text</span> {
                  <span class="name">text</span>: <span class="name">model</span>.<span class="name">fileName</span>
              }
              <span class="type">MouseArea</span> {
                  <span class="name">id</span>: <span class="name">mArea</span>
                  <span class="name">anchors</span>.fill: <span class="name">parent</span>
                  <span class="name">onClicked</span>: {
                      <span class="name">print</span> (<span class="string">&quot;path: &quot;</span> <span class="operator">+</span> <span class="name">model</span>.<span class="name">filePath</span> <span class="operator">+</span> <span class="string">&quot; &quot;</span> <span class="operator">+</span> <span class="name">model</span>.<span class="name">fileName</span>)
                      <span class="name">root</span>.<span class="name">fileName</span> <span class="operator">=</span> <span class="name">model</span>.<span class="name">filePath</span>
                  }
              }
          }

</pre>
<a name="root-element"></a>
<h2 id="root-element">Root Element</h2>
<p>The already mentioned <code>root</code> element collects the necessary pieces of data for the picture transfer. Once the file name has been set it triggers the file transfer:</p>
<pre class="qml">

  <span class="type">Image</span> {
      <span class="name">id</span>: <span class="name">root</span>
      property <span class="type">string</span> <span class="name">remoteDevice</span>;
      property <span class="type">string</span> <span class="name">fileName</span>;
      <span class="name">onFileNameChanged</span>: {
          <span class="name">fileTransfer</span>.<span class="name">initTransfer</span>(<span class="name">remoteDevice</span>, <span class="name">fileName</span>);
          <span class="name">loader</span>.<span class="name">source</span> <span class="operator">=</span> <span class="string">&quot;FileSending.qml&quot;</span>
      }
      <span class="name">onFileNameChanged</span>: {
          <span class="name">fileTransfer</span>.<span class="name">initTransfer</span>(<span class="name">remoteDevice</span>, <span class="name">fileName</span>);
          <span class="name">loader</span>.<span class="name">source</span> <span class="operator">=</span> <span class="string">&quot;FileSending.qml&quot;</span>
      }

</pre>
<a name="file-transfer"></a>
<h2 id="file-transfer">File Transfer</h2>
<p>The file transfer is implemented in C++:</p>
<pre class="cpp">

  <span class="type">void</span> FileTransfer<span class="operator">::</span>initTransfer(<span class="type">QString</span> address<span class="operator">,</span> <span class="type">QString</span> fileName)
  {
      <a href="../qtcore/qtglobal.html#qDebug">qDebug</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Begin sharing file: &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> address <span class="operator">&lt;</span><span class="operator">&lt;</span> fileName;
      <span class="type">QBluetoothAddress</span> btAddress <span class="operator">=</span> <span class="type">QBluetoothAddress</span>(address);
      <span class="type">QBluetoothTransferRequest</span> request(btAddress);
      <span class="type">QFile</span> <span class="operator">*</span>file <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QFile</span>(fileName);
      reply <span class="operator">=</span> manager<span class="operator">.</span>put(request<span class="operator">,</span> file);
      connect(reply<span class="operator">,</span> SIGNAL(transferProgress(<span class="type">qint64</span><span class="operator">,</span><span class="type">qint64</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateProgress(<span class="type">qint64</span><span class="operator">,</span><span class="type">qint64</span>)));
  }

</pre>
<p>and exposed to QML via a context property:</p>
<pre class="cpp">

      <span class="type">QQuickView</span> view;
      FileTransfer fileTransfer;
      view<span class="operator">.</span>rootContext()<span class="operator">-</span><span class="operator">&gt;</span>setContextProperty(<span class="string">&quot;fileTransfer&quot;</span><span class="operator">,</span> <span class="type">QVariant</span><span class="operator">::</span>fromValue(<span class="operator">&amp;</span>fileTransfer));

</pre>
<p>Files:</p>
<ul>
<li><a href="qtbluetooth-picturetransfer-button-qml.html">picturetransfer/Button.qml</a></li>
<li><a href="qtbluetooth-picturetransfer-devicediscovery-qml.html">picturetransfer/DeviceDiscovery.qml</a></li>
<li><a href="qtbluetooth-picturetransfer-filesending-qml.html">picturetransfer/FileSending.qml</a></li>
<li><a href="qtbluetooth-picturetransfer-pictureselector-qml.html">picturetransfer/PictureSelector.qml</a></li>
<li><a href="qtbluetooth-picturetransfer-bttransfer-qml.html">picturetransfer/bttransfer.qml</a></li>
<li><a href="qtbluetooth-picturetransfer-filetransfer-cpp.html">picturetransfer/filetransfer.cpp</a></li>
<li><a href="qtbluetooth-picturetransfer-filetransfer-h.html">picturetransfer/filetransfer.h</a></li>
<li><a href="qtbluetooth-picturetransfer-main-cpp.html">picturetransfer/main.cpp</a></li>
<li><a href="qtbluetooth-picturetransfer-picturetransfer-pro.html">picturetransfer/picturetransfer.pro</a></li>
<li><a href="qtbluetooth-picturetransfer-qmltransfer-qrc.html">picturetransfer/qmltransfer.qrc</a></li>
</ul>
</div>
<p><b>See also </b><a href="qtbluetooth-index.html">Qt Bluetooth</a>.</p>
<!-- @@@picturetransfer -->
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