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* GeSHi (C) 2004 - 2007 Nigel McNie, 2007 - 2008 Benny Baumann
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<div class="title"><a href='http://arduino.cc/en'>Arduino</a></div>
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<p><strong>Reference</strong> <a class='wikilink' href='index.html'>Language</a> | <a class='wikilink' href='Libraries.html'>Libraries</a> | <a class='wikilink' href='Comparison.html'>Comparison</a> | <a class='wikilink' href='Changes.html'>Changes</a>
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<p class='vspace'></p><p><a class='wikilink' href='Ethernet.html'>Ethernet</a> : <em>Client</em> class
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</p>
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<p class='vspace'></p><h2>connected()</h2>
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<h4>Description</h4>
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<p>Whether or not the client is connected. Note that a client is considered connected if the connection has been closed but there is still unread data.
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</p>
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<p class='vspace'></p><h4>Syntax</h4>
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<p><em>client</em>.connected()
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</p>
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<p class='vspace'></p><h4>Parameters</h4>
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<p>none
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</p>
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<p class='vspace'></p><h4>Returns</h4>
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<p>Returns true if the client is connected, false if not.
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</p>
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<p class='vspace'></p><h4>Example</h4>
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<p>
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<div class='sourceblock ' id='sourceblock1'>
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<div class='sourceblocktext'><div class="arduino"><span class="co2">#include <Ethernet.h></span><br />
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<span class="co2">#include <SPI.h></span><br />
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<br />
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<span class="kw1">byte</span> mac<span class="br0">[</span><span class="br0">]</span> <span class="sy0">=</span> <span class="br0">{</span> <span class="nu12">0xDE</span><span class="sy0">,</span> <span class="nu12">0xAD</span><span class="sy0">,</span> <span class="nu12">0xBE</span><span class="sy0">,</span> <span class="nu12">0xEF</span><span class="sy0">,</span> <span class="nu12">0xFE</span><span class="sy0">,</span> <span class="nu12">0xED</span> <span class="br0">}</span><span class="sy0">;</span><br />
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<span class="kw1">byte</span> ip<span class="br0">[</span><span class="br0">]</span> <span class="sy0">=</span> <span class="br0">{</span> <span class="nu0">10</span><span class="sy0">,</span> <span class="nu0">0</span><span class="sy0">,</span> <span class="nu0">0</span><span class="sy0">,</span> <span class="nu0">177</span> <span class="br0">}</span><span class="sy0">;</span><br />
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<span class="kw1">byte</span> server<span class="br0">[</span><span class="br0">]</span> <span class="sy0">=</span> <span class="br0">{</span> <span class="nu0">64</span><span class="sy0">,</span> <span class="nu0">233</span><span class="sy0">,</span> <span class="nu0">187</span><span class="sy0">,</span> <span class="nu0">99</span> <span class="br0">}</span><span class="sy0">;</span> <span class="co1">// Google</span><br />
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<br />
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EthernetClient client<span class="sy0">;</span><br />
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<br />
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<span class="kw1">void</span> <span class="kw3">setup</span><span class="br0">(</span><span class="br0">)</span><br />
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<span class="br0">{</span><br />
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Ethernet.<span class="kw1">begin</span><span class="br0">(</span>mac<span class="sy0">,</span> ip<span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">begin</span><span class="br0">(</span><span class="nu0">9600</span><span class="br0">)</span><span class="sy0">;</span><br />
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<br />
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<span class="kw1">delay</span><span class="br0">(</span><span class="nu0">1000</span><span class="br0">)</span><span class="sy0">;</span><br />
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<br />
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<span class="kw1">Serial</span>.<span class="kw1">println</span><span class="br0">(</span><span class="st0">"connecting..."</span><span class="br0">)</span><span class="sy0">;</span><br />
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<br />
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<span class="kw1">if</span> <span class="br0">(</span>client.<span class="kw1">connect</span><span class="br0">(</span>server<span class="sy0">,</span> <span class="nu0">80</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">println</span><span class="br0">(</span><span class="st0">"connected"</span><span class="br0">)</span><span class="sy0">;</span><br />
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client.<span class="kw1">println</span><span class="br0">(</span><span class="st0">"GET /search?q=arduino HTTP/1.0"</span><span class="br0">)</span><span class="sy0">;</span><br />
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client.<span class="kw1">println</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="br0">}</span> <span class="kw1">else</span> <span class="br0">{</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">println</span><span class="br0">(</span><span class="st0">"connection failed"</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="br0">}</span><br />
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<span class="br0">}</span><br />
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<br />
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<span class="kw1">void</span> <span class="kw3">loop</span><span class="br0">(</span><span class="br0">)</span><br />
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<span class="br0">{</span><br />
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<span class="kw1">if</span> <span class="br0">(</span>client.<span class="kw1">available</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span><br />
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<span class="kw1">char</span> c <span class="sy0">=</span> client.<span class="kw1">read</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">print</span><span class="br0">(</span>c<span class="br0">)</span><span class="sy0">;</span><br />
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<span class="br0">}</span><br />
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<br />
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<span class="kw1">if</span> <span class="br0">(</span><span class="sy0">!</span>client.<span class="kw1">connected</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">println</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">Serial</span>.<span class="kw1">println</span><span class="br0">(</span><span class="st0">"disconnecting."</span><span class="br0">)</span><span class="sy0">;</span><br />
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client.<span class="kw1">stop</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span><br />
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<span class="kw1">for</span><span class="br0">(</span><span class="sy0">;;</span><span class="br0">)</span><br />
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<span class="sy0">;</span><br />
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<span class="br0">}</span><br />
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<span class="br0">}</span></div></div>
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<div class='sourceblocklink'><a href='#' type='text/plain'>[Get Code]</a></div>
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<p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
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<p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://arduino.cc/forum/index.php/board,23.0.html' rel='nofollow'>Forum</a>.</em>
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</p>
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<p class='vspace'></p><p>The text of the Arduino reference is licensed under a
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<a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>. Code samples in the reference are released into the public domain.
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