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mastodonpp/docs/example01_instance_info_8cpp-example.html
tastytea 602a85684a
2020-01-11
2020-01-11 17:19:34 +01:00

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&#160;<span id="projectnumber">0.2.0</span>
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<div class="title">example01_instance_info.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">// Print information about an instance (/api/v1/instance).</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include &quot;mastodonpp.hpp&quot;</span></div>
<div class="line"> </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> std::cout;</div>
<div class="line"><span class="keyword">using</span> std::cerr;</div>
<div class="line"><span class="keyword">using</span> std::endl;</div>
<div class="line"><span class="keyword">using</span> std::to_string;</div>
<div class="line"><span class="keyword">using</span> std::string_view;</div>
<div class="line"><span class="keyword">using</span> std::vector;</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 an Instance.</span></div>
<div class="line"> masto::Instance instance{args[1], {}};</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Get maximum allowed characters per post.</span></div>
<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> max_chars{instance.get_max_chars()};</div>
<div class="line"> cout &lt;&lt; <span class="stringliteral">&quot;Maximum characters per post: &quot;</span> &lt;&lt; max_chars &lt;&lt; <span class="stringliteral">&quot;\n\n&quot;</span>;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Initialize a Connection.</span></div>
<div class="line"> masto::Connection connection{instance};</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Get information about the instance.</span></div>
<div class="line"> masto::answer_type answer{connection.get(masto::API::v1::instance)};</div>
<div class="line"> <span class="keywordflow">if</span> (answer)</div>
<div class="line"> {</div>
<div class="line"> cout &lt;&lt; answer &lt;&lt; endl;</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">else</span></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; endl;</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)</div>
<div class="line"> &lt;&lt; <span class="stringliteral">&quot;: &quot;</span> &lt;&lt; answer.error_message &lt;&lt; endl;</div>
<div class="line"> }</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; endl;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
</div><!-- fragment --> </div><!-- contents -->
<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> answer.cpp:22</div></div>
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