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<div id="projectname">mastodonpp
&#160;<span id="projectnumber">0.5.7</span>
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<div id="projectbrief">C++ wrapper for the Mastodon and Pleroma APIs.</div>
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<div class="title">example09_nlohmann_json.cpp</div> </div>
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<div class="contents">
<div class="fragment"><div class="line"><span class="comment">/* This file is part of mastodonpp.</span></div>
<div class="line"><span class="comment"> * Copyright © 2020 tastytea &lt;tastytea@tastytea.de&gt;</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Permission to use, copy, modify, and/or distribute this software for any</span></div>
<div class="line"><span class="comment"> * purpose with or without fee is hereby granted.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
<div class="line"><span class="comment"> * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
<div class="line"><span class="comment"> * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY</span></div>
<div class="line"><span class="comment"> * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
<div class="line"><span class="comment"> * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION</span></div>
<div class="line"><span class="comment"> * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN</span></div>
<div class="line"><span class="comment"> * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> </div>
<div class="line"><span class="comment">// Get the last 4 public statuses of an instance and process them with</span></div>
<div class="line"><span class="comment">// nlohmann-json. &lt;https://github.com/nlohmann/json&gt;</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#if __has_include(&quot;mastodonpp.hpp&quot;</span>)</div>
<div class="line"><span class="preprocessor"># include &quot;mastodonpp.hpp&quot;</span> <span class="comment">// We&#39;re building mastodonpp.</span></div>
<div class="line"><span class="preprocessor">#else</span></div>
<div class="line"><span class="preprocessor"># include &lt;mastodonpp/mastodonpp.hpp&gt;</span> <span class="comment">// We&#39;re building outside mastodonpp.</span></div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"> </div>
<div class="line"><span class="comment">// Don&#39;t compile if nlohmann-json can&#39;t be found.</span></div>
<div class="line"><span class="preprocessor">#if __has_include(&lt;nlohmann/json.hpp&gt;)</span></div>
<div class="line"><span class="preprocessor"># include &lt;nlohmann/json.hpp&gt;</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor"># include &lt;cstdlib&gt;</span></div>
<div class="line"><span class="preprocessor"># include &lt;iostream&gt;</span></div>
<div class="line"><span class="preprocessor"># include &lt;string&gt;</span></div>
<div class="line"><span class="preprocessor"># include &lt;string_view&gt;</span></div>
<div class="line"><span class="preprocessor"># include &lt;vector&gt;</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">namespace </span>masto = <a class="code" href="namespacemastodonpp.html">mastodonpp</a>;</div>
<div class="line"><span class="keyword">using</span> json = nlohmann::json;</div>
<div class="line"><span class="keyword">using</span> std::cerr;</div>
<div class="line"><span class="keyword">using</span> std::cout;</div>
<div class="line"><span class="keyword">using</span> std::exit;</div>
<div class="line"><span class="keyword">using</span> std::string_view;</div>
<div class="line"><span class="keyword">using</span> std::to_string;</div>
<div class="line"><span class="keyword">using</span> std::vector;</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> handle_error(<span class="keyword">const</span> masto::answer_type &amp;answer);</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div>
<div class="line">{</div>
<div class="line"> <span class="keyword">const</span> vector&lt;string_view&gt; args(argv, argv + argc);</div>
<div class="line"> <span class="keywordflow">if</span> (args.size() &lt;= 1)</div>
<div class="line"> {</div>
<div class="line"> cerr &lt;&lt; <span class="stringliteral">&quot;Usage: &quot;</span> &lt;&lt; args[0] &lt;&lt; <span class="stringliteral">&quot; &lt;instance hostname&gt;\n&quot;</span>;</div>
<div class="line"> <span class="keywordflow">return</span> 1;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">try</span></div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Initialize Instance and Connection.</span></div>
<div class="line"> masto::Instance instance{args[1], {}};</div>
<div class="line"> masto::Connection connection{instance};</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Get the last 4 public statuses of the instance.</span></div>
<div class="line"> <span class="keyword">auto</span> answer{connection.get(masto::API::v1::timelines_public,</div>
<div class="line"> {{<span class="stringliteral">&quot;limit&quot;</span>, <span class="stringliteral">&quot;4&quot;</span>}, {<span class="stringliteral">&quot;local&quot;</span>, <span class="stringliteral">&quot;true&quot;</span>}})};</div>
<div class="line"> <span class="keywordflow">if</span> (answer)</div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Parse JSON string.</span></div>
<div class="line"> <span class="keyword">auto</span> statuses{json::parse(answer.body)};</div>
<div class="line"> <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span> &amp;status : statuses)</div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Extract the info we want and print it.</span></div>
<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> acct{status[<span class="stringliteral">&quot;account&quot;</span>][<span class="stringliteral">&quot;acct&quot;</span>].get&lt;string_view&gt;()};</div>
<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> content{status[<span class="stringliteral">&quot;content&quot;</span>].get&lt;string_view&gt;()};</div>
<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> <span class="keywordtype">id</span>{status[<span class="stringliteral">&quot;id&quot;</span>].get&lt;string_view&gt;()};</div>
<div class="line"> cout &lt;&lt; acct &lt;&lt; <span class="stringliteral">&quot; wrote status &quot;</span> &lt;&lt; <span class="keywordtype">id</span> &lt;&lt; <span class="stringliteral">&quot;: \n&quot;</span>;</div>
<div class="line"> cout &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; content.substr(0, 76) &lt;&lt; <span class="stringliteral">&quot; …\n&quot;</span>;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Print tags if there are any.</span></div>
<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> tags{status[<span class="stringliteral">&quot;tags&quot;</span>]};</div>
<div class="line"> <span class="keywordflow">if</span> (!tags.empty())</div>
<div class="line"> {</div>
<div class="line"> cout &lt;&lt; <span class="stringliteral">&quot; Tags: &quot;</span>;</div>
<div class="line"> <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span> &amp;tag : tags)</div>
<div class="line"> {</div>
<div class="line"> cout &lt;&lt; <span class="charliteral">&#39;#&#39;</span> &lt;&lt; tag[<span class="stringliteral">&quot;name&quot;</span>].get&lt;string_view&gt;() &lt;&lt; <span class="stringliteral">&quot; &quot;</span>;</div>
<div class="line"> }</div>
<div class="line"> cout &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Print the number of attachments.</span></div>
<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> n_attachments{status[<span class="stringliteral">&quot;media_attachments&quot;</span>].size()};</div>
<div class="line"> <span class="keywordflow">if</span> (n_attachments &gt; 0)</div>
<div class="line"> {</div>
<div class="line"> cout &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; n_attachments &lt;&lt; <span class="stringliteral">&quot; attachment&quot;</span>;</div>
<div class="line"> <span class="keywordflow">if</span> (n_attachments &gt; 1)</div>
<div class="line"> {</div>
<div class="line"> cout &lt;&lt; <span class="stringliteral">&quot;s&quot;</span>;</div>
<div class="line"> }</div>
<div class="line"> cout &lt;&lt; <span class="stringliteral">&quot;.\n&quot;</span>;</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">else</span></div>
<div class="line"> {</div>
<div class="line"> handle_error(answer);</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">catch</span> (<span class="keyword">const</span> masto::CURLException &amp;e)</div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Only libcurl errors that are not network errors will be thrown.</span></div>
<div class="line"> <span class="comment">// There went probably something wrong with the initialization.</span></div>
<div class="line"> cerr &lt;&lt; e.what() &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">catch</span> (<span class="keyword">const</span> nlohmann::detail::exception &amp;e)</div>
<div class="line"> {</div>
<div class="line"> cerr &lt;&lt; <span class="stringliteral">&quot;JSON exception: &quot;</span> &lt;&lt; e.what() &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"> }</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> handle_error(<span class="keyword">const</span> masto::answer_type &amp;answer)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordflow">if</span> (answer.curl_error_code == 0)</div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// If it is no libcurl error, it must be an HTTP error.</span></div>
<div class="line"> cerr &lt;&lt; <span class="stringliteral">&quot;HTTP status: &quot;</span> &lt;&lt; answer.http_status &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">else</span></div>
<div class="line"> {</div>
<div class="line"> <span class="comment">// Network errors like “Couldn&#39;t resolve host.”.</span></div>
<div class="line"> cerr &lt;&lt; <span class="stringliteral">&quot;libcurl error &quot;</span> &lt;&lt; to_string(answer.curl_error_code) &lt;&lt; <span class="stringliteral">&quot;: &quot;</span></div>
<div class="line"> &lt;&lt; answer.error_message &lt;&lt; <span class="charliteral">&#39;\n&#39;</span>;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> exit(1);</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#else</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor"># include &lt;iostream&gt;</span></div>
<div class="line"><span class="keywordtype">int</span> main()</div>
<div class="line">{</div>
<div class="line"> std::cout &lt;&lt; <span class="stringliteral">&quot;Example could not be compiled &quot;</span></div>
<div class="line"> <span class="stringliteral">&quot;because nlohmann-json was not found.\n&quot;</span>;</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#endif </span><span class="comment">// __has_include(&lt;nlohmann/json.hpp&gt;)</span></div>
<div class="ttc" id="anamespacemastodonpp_html"><div class="ttname"><a href="namespacemastodonpp.html">mastodonpp</a></div><div class="ttdoc">C++ wrapper for the Mastodon API.</div><div class="ttdef"><b>Definition:</b> api.hpp:25</div></div>
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