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<title>7. Httpc client &mdash; BL602 IoT SDK release_bl_iot_sdk_1.6.11-1-g66bb28da 文档</title>
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<p class="caption"><span class="caption-text">Developer_Environment</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../../Developer_Environment/Developer_Environment.html">1. Developer Environment</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo_peripherals_gpio/GPIO.html">3. GPIO</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo_protocols_http/http.html">6. Http client</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">7. Httpc client</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#id1">7.1. 总览</a></li>
<li class="toctree-l2"><a class="reference internal" href="#id2">7.2. 准备和使用步骤</a></li>
<li class="toctree-l2"><a class="reference internal" href="#id3">7.3. 应用实例</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../demo_system_cli/cli.html">10. cli</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_system_fdt/fdt.html">11. FDT</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_wifi/wifi.html">12. WiFi</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_ble/ble.html">13. BLE</a></li>
<li class="toctree-l1"><a class="reference internal" href="../demo_mesh/mesh.html">14. Mesh</a></li>
<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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<li class="toctree-l1"><a class="reference internal" href="../../Components/arch.html">1. arch</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Components/Middleware/bloop/bloop.html">5. BLOOP</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Components/Middleware/security/security.html">9. Security</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../Components/Network/httpc/httpc.html">12. HTTPC</a></li>
<li class="toctree-l1"><a class="reference internal" href="../../Components/Network/https/https.html">13. HTTPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../../API/wifi/wifi_mgmr.html">2. Wi-Fi Manager</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">
<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>
<div class="section" id="id1">
<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>
<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>
</div>
<div class="section" id="id2">
<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>
<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>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">&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/image117.png" />
</div>
<div class="figure align-default">
<img alt="" src="../../_images/image215.png" />
</div>
</li>
<li><p>使用 <code class="docutils literal notranslate"><span class="pre">httpc</span></code> 命令进行下载。</p>
<div class="figure align-default">
<img alt="" src="../../_images/image314.png" />
</div>
</li>
</ul>
</li>
</ul>
</div>
<div class="section" id="id3">
<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>
<ul class="simple">
<li><p>主要实现过程</p></li>
</ul>
<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>
<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>
<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>
<span class="n">httpc_get_file_dns</span><span class="p">(</span>
<span class="s2">&quot;nf.cr.dandanman.com&quot;</span><span class="p">,</span>
<span class="mi">80</span><span class="p">,</span>
<span class="s2">&quot;/ddm/ContentResource/music/204.mp3&quot;</span><span class="p">,</span>
<span class="o">&amp;</span><span class="n">settings</span><span class="p">,</span>
<span class="n">cb_altcp_recv_fn</span><span class="p">,</span>
<span class="o">&amp;</span><span class="n">req</span><span class="p">,</span>
<span class="o">&amp;</span><span class="n">req</span>
<span class="p">);</span>
</pre></div>
</div>
<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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