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<h1 class="title">blockingclient.cpp Example File</h1>
<span class="subtitle">blockingfortuneclient/blockingclient.cpp</span>
<!-- $$$blockingfortuneclient/blockingclient.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
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  ** This file is part of the examples of the Qt Toolkit.
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  <span class="preprocessor">#include &lt;QtWidgets&gt;</span>
  <span class="preprocessor">#include &lt;QtNetwork&gt;</span>

  <span class="preprocessor">#include &quot;blockingclient.h&quot;</span>

  BlockingClient<span class="operator">::</span>BlockingClient(<span class="type">QWidget</span> <span class="operator">*</span>parent)
      : <span class="type">QWidget</span>(parent)
  {
      hostLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLabel</span>(tr(<span class="string">&quot;&amp;Server name:&quot;</span>));
      portLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLabel</span>(tr(<span class="string">&quot;S&amp;erver port:&quot;</span>));

      <span class="comment">// find out which IP to connect to</span>
      <span class="type"><a href="../qtcore/qstring.html">QString</a></span> ipAddress;
      <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">&gt;</span> ipAddressesList <span class="operator">=</span> <span class="type"><a href="qnetworkinterface.html">QNetworkInterface</a></span><span class="operator">::</span>allAddresses();
      <span class="comment">// use the first non-localhost IPv4 address</span>
      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> ipAddressesList<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
          <span class="keyword">if</span> (ipAddressesList<span class="operator">.</span>at(i) <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>LocalHost <span class="operator">&amp;</span><span class="operator">&amp;</span>
              ipAddressesList<span class="operator">.</span>at(i)<span class="operator">.</span>toIPv4Address()) {
              ipAddress <span class="operator">=</span> ipAddressesList<span class="operator">.</span>at(i)<span class="operator">.</span>toString();
              <span class="keyword">break</span>;
          }
      }
      <span class="comment">// if we did not find one, use IPv4 localhost</span>
      <span class="keyword">if</span> (ipAddress<span class="operator">.</span>isEmpty())
          ipAddress <span class="operator">=</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span>(<span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>LocalHost)<span class="operator">.</span>toString();

      hostLineEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLineEdit</span>(ipAddress);
      portLineEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLineEdit</span>;
      portLineEdit<span class="operator">-</span><span class="operator">&gt;</span>setValidator(<span class="keyword">new</span> <span class="type"><a href="../qtgui/qintvalidator.html">QIntValidator</a></span>(<span class="number">1</span><span class="operator">,</span> <span class="number">65535</span><span class="operator">,</span> <span class="keyword">this</span>));

      hostLabel<span class="operator">-</span><span class="operator">&gt;</span>setBuddy(hostLineEdit);
      portLabel<span class="operator">-</span><span class="operator">&gt;</span>setBuddy(portLineEdit);

      statusLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLabel</span>(tr(<span class="string">&quot;This examples requires that you run the &quot;</span>
                                  <span class="string">&quot;Fortune Server example as well.&quot;</span>));
      statusLabel<span class="operator">-</span><span class="operator">&gt;</span>setWordWrap(<span class="keyword">true</span>);

      getFortuneButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>(tr(<span class="string">&quot;Get Fortune&quot;</span>));
      getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setDefault(<span class="keyword">true</span>);
      getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);

      quitButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>(tr(<span class="string">&quot;Quit&quot;</span>));

      buttonBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDialogButtonBox</span>;
      buttonBox<span class="operator">-</span><span class="operator">&gt;</span>addButton(getFortuneButton<span class="operator">,</span> <span class="type">QDialogButtonBox</span><span class="operator">::</span>ActionRole);
      buttonBox<span class="operator">-</span><span class="operator">&gt;</span>addButton(quitButton<span class="operator">,</span> <span class="type">QDialogButtonBox</span><span class="operator">::</span>RejectRole);

      connect(getFortuneButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(requestNewFortune()));
      connect(quitButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));

      connect(hostLineEdit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(enableGetFortuneButton()));
      connect(portLineEdit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(enableGetFortuneButton()));
      connect(<span class="operator">&amp;</span>thread<span class="operator">,</span> SIGNAL(newFortune(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(showFortune(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>)));
      connect(<span class="operator">&amp;</span>thread<span class="operator">,</span> SIGNAL(error(<span class="type">int</span><span class="operator">,</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(displayError(<span class="type">int</span><span class="operator">,</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span>)));

      <span class="type">QGridLayout</span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QGridLayout</span>;
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(hostLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(hostLineEdit<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>);
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(portLabel<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(portLineEdit<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(statusLabel<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
      mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(buttonBox<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
      setLayout(mainLayout);

      setWindowTitle(tr(<span class="string">&quot;Blocking Fortune Client&quot;</span>));
      portLineEdit<span class="operator">-</span><span class="operator">&gt;</span>setFocus();
  }

  <span class="type">void</span> BlockingClient<span class="operator">::</span>requestNewFortune()
  {
      getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
      thread<span class="operator">.</span>requestNewFortune(hostLineEdit<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">,</span>
                               portLineEdit<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>toInt());
  }

  <span class="type">void</span> BlockingClient<span class="operator">::</span>showFortune(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>nextFortune)
  {
      <span class="keyword">if</span> (nextFortune <span class="operator">=</span><span class="operator">=</span> currentFortune) {
          requestNewFortune();
          <span class="keyword">return</span>;
      }

      currentFortune <span class="operator">=</span> nextFortune;
      statusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(currentFortune);
      getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
  }

  <span class="type">void</span> BlockingClient<span class="operator">::</span>displayError(<span class="type">int</span> socketError<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>message)
  {
      <span class="keyword">switch</span> (socketError) {
      <span class="keyword">case</span> <span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>HostNotFoundError:
          <span class="type">QMessageBox</span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Blocking Fortune Client&quot;</span>)<span class="operator">,</span>
                                   tr(<span class="string">&quot;The host was not found. Please check the &quot;</span>
                                      <span class="string">&quot;host and port settings.&quot;</span>));
          <span class="keyword">break</span>;
      <span class="keyword">case</span> <span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>ConnectionRefusedError:
          <span class="type">QMessageBox</span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Blocking Fortune Client&quot;</span>)<span class="operator">,</span>
                                   tr(<span class="string">&quot;The connection was refused by the peer. &quot;</span>
                                      <span class="string">&quot;Make sure the fortune server is running, &quot;</span>
                                      <span class="string">&quot;and check that the host name and port &quot;</span>
                                      <span class="string">&quot;settings are correct.&quot;</span>));
          <span class="keyword">break</span>;
      <span class="keyword">default</span>:
          <span class="type">QMessageBox</span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Blocking Fortune Client&quot;</span>)<span class="operator">,</span>
                                   tr(<span class="string">&quot;The following error occurred: %1.&quot;</span>)
                                   <span class="operator">.</span>arg(message));
      }

      getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
  }

  <span class="type">void</span> BlockingClient<span class="operator">::</span>enableGetFortuneButton()
  {
      bool enable(<span class="operator">!</span>hostLineEdit<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>isEmpty() <span class="operator">&amp;</span><span class="operator">&amp;</span> <span class="operator">!</span>portLineEdit<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>isEmpty());
      getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(enable);
  }

</pre>
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<!-- @@@blockingfortuneclient/blockingclient.cpp -->
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