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<li class="toctree-l2"><a class="reference internal" href="#id1">6.1. 总览</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo_wifi/wifi.html">12. WiFi</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo_blsync_ble/blsync_ble.html">15. BLSYNC-BLE</a></li>
<li class="toctree-l1"><a class="reference internal" href="../sdk_app_easyflash_boottimes/easyflash_boottimes.html">16. Easyflash4 boot times</a></li>
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<p class="caption"><span class="caption-text">API</span></p>
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<li><span class="section-number">6. </span>Http client</li>
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<div class="section" id="http-client">
<span id="http-index"></span><h1><span class="section-number">6. </span>Http client<a class="headerlink" href="#http-client" title="永久链接至标题"></a></h1>
<div class="section" id="id1">
<h2><span class="section-number">6.1. </span>总览<a class="headerlink" href="#id1" title="永久链接至标题"></a></h2>
<p>本示例主要介绍如何创建一个socket并连接到指定的Http服务器获取数据的过程。</p>
</div>
<div class="section" id="id2">
<h2><span class="section-number">6.2. </span>准备和使用步骤<a class="headerlink" href="#id2" title="永久链接至标题"></a></h2>
<ul>
<li><p>使用之前需要准备可用的URL以及网络。</p></li>
<li><p>使用步骤：</p>
<ul>
<li><p>编译 <code class="docutils literal notranslate"><span class="pre">customer_app/sdk_app_http_client_socket</span></code> 工程并下载工程；</p></li>
<li><p>在终端输入开启wifi的命令： <code class="docutils literal notranslate"><span class="pre">stack_wifi</span></code> ，输入连接wifi的命令： <code class="docutils literal notranslate"><span class="pre">wifi_sta_connect</span> <span class="pre">&lt;name&gt;</span> <span class="pre">&lt;key&gt;</span></code> ，并确认wifi连接成功（如输入：wifi_sta_connect bl_test_005 12345678）；</p>
<div class="figure align-default">
<img alt="" src="../../_images/image116.png" />
</div>
<div class="figure align-default">
<img alt="" src="../../_images/image214.png" />
</div>
</li>
<li><p>使用 <code class="docutils literal notranslate"><span class="pre">http</span></code> 命令通过socket的方式进行下载。</p>
<div class="figure align-default">
<img alt="" src="../../_images/image313.png" />
</div>
</li>
</ul>
</li>
</ul>
</div>
<div class="section" id="id3">
<h2><span class="section-number">6.3. </span>应用实例<a class="headerlink" href="#id3" title="永久链接至标题"></a></h2>
<ul class="simple">
<li><p>通过 <code class="docutils literal notranslate"><span class="pre">hostname</span></code> 获取 <code class="docutils literal notranslate"><span class="pre">hostinfo</span></code></p></li>
</ul>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>struct hostent *hostinfo = gethostbyname(hostname);
if (!hostinfo) {
printf(&quot;gethostbyname Failed\r\n&quot;);
return -1;
}
</pre></div>
</div>
<ul class="simple">
<li><p>创建一个 <code class="docutils literal notranslate"><span class="pre">socket</span></code> 连接并发送http请求。</p></li>
</ul>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">((</span><span class="n">sockfd</span> <span class="o">=</span> <span class="n">socket</span><span class="p">(</span><span class="n">AF_INET</span><span class="p">,</span> <span class="n">SOCK_STREAM</span><span class="p">,</span> <span class="mi">0</span><span class="p">))</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">printf</span><span class="p">(</span><span class="s2">&quot;Error in socket</span><span class="se">\r\n</span><span class="s2">&quot;</span><span class="p">);</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="o">/*---</span><span class="n">Initialize</span> <span class="n">server</span> <span class="n">address</span><span class="o">/</span><span class="n">port</span> <span class="n">struct</span><span class="o">---*/</span>
<span class="n">memset</span><span class="p">(</span><span class="o">&amp;</span><span class="n">dest</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="n">sizeof</span><span class="p">(</span><span class="n">dest</span><span class="p">));</span>
<span class="n">dest</span><span class="o">.</span><span class="n">sin_family</span> <span class="o">=</span> <span class="n">AF_INET</span><span class="p">;</span>
<span class="n">dest</span><span class="o">.</span><span class="n">sin_port</span> <span class="o">=</span> <span class="n">htons</span><span class="p">(</span><span class="n">PORT</span><span class="p">);</span>
<span class="n">dest</span><span class="o">.</span><span class="n">sin_addr</span> <span class="o">=</span> <span class="o">*</span><span class="p">((</span><span class="n">struct</span> <span class="n">in_addr</span> <span class="o">*</span><span class="p">)</span> <span class="n">hostinfo</span><span class="o">-&gt;</span><span class="n">h_addr</span><span class="p">);</span>
<span class="o">//</span><span class="n">char</span> <span class="n">ip</span><span class="p">[</span><span class="mi">16</span><span class="p">];</span>
<span class="n">uint32_t</span> <span class="n">address</span> <span class="o">=</span> <span class="n">dest</span><span class="o">.</span><span class="n">sin_addr</span><span class="o">.</span><span class="n">s_addr</span><span class="p">;</span>
<span class="n">char</span> <span class="o">*</span><span class="n">ip</span> <span class="o">=</span> <span class="n">inet_ntoa</span><span class="p">(</span><span class="n">address</span><span class="p">);</span>
<span class="n">printf</span><span class="p">(</span><span class="s2">&quot;Server ip Address : </span><span class="si">%s</span><span class="se">\r\n</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">ip</span><span class="p">);</span>
<span class="o">/*---</span><span class="n">Connect</span> <span class="n">to</span> <span class="n">server</span><span class="o">---*/</span>
<span class="k">if</span> <span class="p">(</span><span class="n">connect</span><span class="p">(</span><span class="n">sockfd</span><span class="p">,</span>
<span class="p">(</span><span class="n">struct</span> <span class="n">sockaddr</span> <span class="o">*</span><span class="p">)</span><span class="o">&amp;</span><span class="n">dest</span><span class="p">,</span>
<span class="n">sizeof</span><span class="p">(</span><span class="n">dest</span><span class="p">))</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">printf</span><span class="p">(</span><span class="s2">&quot;Error in connect</span><span class="se">\r\n</span><span class="s2">&quot;</span><span class="p">);</span>
<span class="k">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span>
<span class="p">}</span>
<span class="o">/*---</span><span class="n">Get</span> <span class="s2">&quot;Hello?&quot;</span><span class="o">---*/</span>
<span class="n">memset</span><span class="p">(</span><span class="n">buffer</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="n">MAXBUF</span><span class="p">);</span>
<span class="n">char</span> <span class="n">wbuf</span><span class="p">[]</span>
<span class="o">=</span> <span class="s2">&quot;GET /ddm/ContentResource/music/204.mp3 HTTP/1.1</span><span class="se">\r\n</span><span class="s2">Host: nf.cr.dandanman.com</span><span class="se">\r\n</span><span class="s2">User-Agent: wmsdk</span><span class="se">\r\n</span><span class="s2">Accept: */*</span><span class="se">\r\n\r\n</span><span class="s2">&quot;</span><span class="p">;</span>
<span class="n">write</span><span class="p">(</span><span class="n">sockfd</span><span class="p">,</span> <span class="n">wbuf</span><span class="p">,</span> <span class="n">sizeof</span><span class="p">(</span><span class="n">wbuf</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span><span class="p">);</span>
</pre></div>
</div>
<ul class="simple">
<li><p>获取http响应的数据，完成时打印获取数据花费的时间和传输的速度。</p></li>
</ul>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">while</span> <span class="p">(</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
<span class="n">ret</span> <span class="o">=</span> <span class="n">read</span><span class="p">(</span><span class="n">sockfd</span><span class="p">,</span> <span class="n">recv_buffer</span><span class="p">,</span> <span class="n">BUFFER_SIZE</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">ret</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">printf</span><span class="p">(</span><span class="s2">&quot;eof</span><span class="se">\n\r</span><span class="s2">&quot;</span><span class="p">);</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">ret</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="n">printf</span><span class="p">(</span><span class="s2">&quot;ret = </span><span class="si">%d</span><span class="s2">, err = </span><span class="si">%d</span><span class="se">\n\r</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">ret</span><span class="p">,</span> <span class="n">errno</span><span class="p">);</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="n">total</span> <span class="o">+=</span> <span class="n">ret</span><span class="p">;</span>
<span class="o">/*</span><span class="n">use</span> <span class="n">less</span> <span class="n">debug</span><span class="o">*/</span>
<span class="k">if</span> <span class="p">(</span><span class="mi">0</span> <span class="o">==</span> <span class="p">((</span><span class="n">debug_counter</span><span class="o">++</span><span class="p">)</span> <span class="o">&amp;</span> <span class="mh">0xFF</span><span class="p">))</span> <span class="p">{</span>
<span class="n">printf</span><span class="p">(</span><span class="s2">&quot;total = </span><span class="si">%d</span><span class="s2">, ret = </span><span class="si">%d</span><span class="se">\n\r</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">total</span><span class="p">,</span> <span class="n">ret</span><span class="p">);</span>
<span class="p">}</span>
<span class="o">//</span><span class="n">vTaskDelay</span><span class="p">(</span><span class="mi">2</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">total</span> <span class="o">&gt;</span> <span class="mi">82050000</span><span class="p">)</span> <span class="p">{</span>
<span class="n">ticks_end</span> <span class="o">=</span> <span class="n">xTaskGetTickCount</span><span class="p">();</span>
<span class="n">time_consumed</span> <span class="o">=</span> <span class="p">((</span><span class="n">uint32_t</span><span class="p">)(((</span><span class="n">int32_t</span><span class="p">)</span><span class="n">ticks_end</span><span class="p">)</span> <span class="o">-</span> <span class="p">((</span><span class="n">int32_t</span><span class="p">)</span><span class="n">ticks_start</span><span class="p">)))</span> <span class="o">/</span> <span class="mi">1000</span><span class="p">;</span>
<span class="n">printf</span><span class="p">(</span><span class="s2">&quot;Download comlete, total time </span><span class="si">%u</span><span class="s2"> s, speed </span><span class="si">%u</span><span class="s2"> Kbps</span><span class="se">\r\n</span><span class="s2">&quot;</span><span class="p">,</span>
<span class="p">(</span><span class="n">unsigned</span> <span class="nb">int</span><span class="p">)</span><span class="n">time_consumed</span><span class="p">,</span>
<span class="p">(</span><span class="n">unsigned</span> <span class="nb">int</span><span class="p">)(</span><span class="n">total</span> <span class="o">/</span> <span class="n">time_consumed</span> <span class="o">*</span> <span class="mi">8</span> <span class="o">/</span> <span class="mi">1000</span><span class="p">)</span>
<span class="p">);</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<ul class="simple">
<li><p>关闭 <code class="docutils literal notranslate"><span class="pre">socket</span></code> 。</p></li>
</ul>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">close</span><span class="p">(</span><span class="n">sockfd</span><span class="p">);</span>
</pre></div>
</div>
<ul class="simple">
<li><p>在 <code class="docutils literal notranslate"><span class="pre">customer_app/sdk_app_http_client_socket/sdk_app_http_client_socket/demo.c</span></code> 中 <code class="docutils literal notranslate"><span class="pre">static</span> <span class="pre">void</span> <span class="pre">_cli_init()</span></code> 的函数里调用 <code class="docutils literal notranslate"><span class="pre">http_client_cli_init()</span></code> 初始化http命令</p></li>
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