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<title>7. Httpc client — BL602 IoT SDK release_bl_iot_sdk_1.6.11-1-g66bb28da 文档</title>
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<li class="toctree-l1 current"><a class="current reference internal" href="#">7. Httpc client</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#id1">7.1. 总览</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#id2">7.2. 准备和使用步骤</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo_mesh/mesh.html">14. Mesh</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Components/Network/httpc/httpc.html">12. HTTPC</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Components/Network/tls/tls.html">14. TLS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Components/BLE/provision_WiFi/provision_WiFi.html">15. Provision_WiFi</a></li>
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<li><span class="section-number">7. </span>Httpc client</li>
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<div class="section" id="httpc-client">
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<span id="httpc-index"></span><h1><span class="section-number">7. </span>Httpc client<a class="headerlink" href="#httpc-client" title="永久链接至标题">¶</a></h1>
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<div class="section" id="id1">
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<h2><span class="section-number">7.1. </span>总览<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h2>
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<p>本示例主要介绍如何通过tcp的方式访问Http服务器获取数据的过程。</p>
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</div>
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<div class="section" id="id2">
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<h2><span class="section-number">7.2. </span>准备和使用步骤<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<ul>
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<li><p>使用之前需要准备可用的URL以及网络。</p></li>
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<li><p>使用步骤：</p>
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<ul>
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<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> ，会打印下图一log（部分），然后输入连接wifi的命令： <code class="docutils literal notranslate"><span class="pre">wifi_sta_connect</span> <span class="pre"><name></span> <span class="pre"><key></span></code> ，并确认wifi连接成功（如输入：wifi_sta_connect bl_test_005 12345678）；</p>
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<div class="figure align-default">
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<img alt="" src="../../_images/image117.png" />
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</div>
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<div class="figure align-default">
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<img alt="" src="../../_images/image215.png" />
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</div>
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</li>
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<li><p>使用 <code class="docutils literal notranslate"><span class="pre">httpc</span></code> 命令进行下载。</p>
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<div class="figure align-default">
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<img alt="" src="../../_images/image314.png" />
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</div>
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</li>
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</ul>
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<div class="section" id="id3">
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<h2><span class="section-number">7.3. </span>应用实例<a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
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<ul class="simple">
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<li><p>主要实现过程</p></li>
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</ul>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span> <span class="n">settings</span><span class="o">.</span><span class="n">use_proxy</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
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<span class="n">settings</span><span class="o">.</span><span class="n">result_fn</span> <span class="o">=</span> <span class="n">cb_httpc_result</span><span class="p">;</span>
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<span class="n">settings</span><span class="o">.</span><span class="n">headers_done_fn</span> <span class="o">=</span> <span class="n">cb_httpc_headers_done_fn</span><span class="p">;</span>
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<span class="n">httpc_get_file_dns</span><span class="p">(</span>
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<span class="s2">"nf.cr.dandanman.com"</span><span class="p">,</span>
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<span class="mi">80</span><span class="p">,</span>
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<span class="s2">"/ddm/ContentResource/music/204.mp3"</span><span class="p">,</span>
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<span class="o">&</span><span class="n">settings</span><span class="p">,</span>
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<span class="n">cb_altcp_recv_fn</span><span class="p">,</span>
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<span class="o">&</span><span class="n">req</span><span class="p">,</span>
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<span class="o">&</span><span class="n">req</span>
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<span class="p">);</span>
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</pre></div>
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</div>
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<p>cb_httpc_result()次回调函数会在http传输完成后调用，打印获取的消息内容长度；cb_httpc_headers_done_fn()回调函数会在接收到http headers时调用，打印headers的大小；用户可以在cb_altcp_recv_fn()回调函数中处理接收到的消息。</p>
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