tastytea
d452daac6e
# # Previous commits: #73648eb
2020-11-13 #a028edd
2020-03-21 #0cbf498
2020-03-21 #e6478b1
2020-03-12
225 lines
16 KiB
HTML
225 lines
16 KiB
HTML
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<meta name="generator" content="Doxygen 1.8.17"/>
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<title>mastodonpp: example09_nlohmann_json.cpp</title>
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<td id="projectalign" style="padding-left: 0.5em;">
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<div id="projectname">mastodonpp
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 <span id="projectnumber">0.5.5</span>
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</div>
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<div id="projectbrief">C++ wrapper for the Mastodon and Pleroma APIs.</div>
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</td>
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</tr>
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/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
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/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
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});
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/* @license-end */</script>
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name="MSearchResults" id="MSearchResults">
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</div>
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<div class="header">
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<div class="headertitle">
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<div class="title">example09_nlohmann_json.cpp</div> </div>
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</div><!--header-->
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<div class="contents">
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<div class="fragment"><div class="line"><span class="comment">/* This file is part of mastodonpp.</span></div>
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<div class="line"><span class="comment"> * Copyright © 2020 tastytea <tastytea@tastytea.de></span></div>
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<div class="line"><span class="comment"> *</span></div>
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<div class="line"><span class="comment"> * Permission to use, copy, modify, and/or distribute this software for any</span></div>
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<div class="line"><span class="comment"> * purpose with or without fee is hereby granted.</span></div>
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<div class="line"><span class="comment"> *</span></div>
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<div class="line"><span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
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<div class="line"><span class="comment"> * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
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<div class="line"><span class="comment"> * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY</span></div>
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<div class="line"><span class="comment"> * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
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<div class="line"><span class="comment"> * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION</span></div>
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<div class="line"><span class="comment"> * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN</span></div>
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<div class="line"><span class="comment"> * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
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<div class="line"><span class="comment"> */</span></div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Get the last 4 public statuses of an instance and process them with</span></div>
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<div class="line"><span class="comment">// nlohmann-json. <https://github.com/nlohmann/json></span></div>
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<div class="line"> </div>
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<div class="line"><span class="preprocessor">#if __has_include("mastodonpp.hpp")</span></div>
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<div class="line"><span class="preprocessor"># include "mastodonpp.hpp"</span> <span class="comment">// We're building mastodonpp.</span></div>
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<div class="line"><span class="preprocessor">#else</span></div>
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<div class="line"><span class="preprocessor"># include <mastodonpp/mastodonpp.hpp></span> <span class="comment">// We're building outside mastodonpp.</span></div>
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<div class="line"><span class="preprocessor">#endif</span></div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Don't compile if nlohmann-json can't be found.</span></div>
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<div class="line"><span class="preprocessor">#if __has_include(<nlohmann/json.hpp>)</span></div>
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<div class="line"><span class="preprocessor"># include <nlohmann/json.hpp></span></div>
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<div class="line"> </div>
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<div class="line"><span class="preprocessor"># include <cstdlib></span></div>
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<div class="line"><span class="preprocessor"># include <iostream></span></div>
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<div class="line"><span class="preprocessor"># include <string></span></div>
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<div class="line"><span class="preprocessor"># include <string_view></span></div>
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<div class="line"><span class="preprocessor"># include <vector></span></div>
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<div class="line"> </div>
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<div class="line"><span class="keyword">namespace </span>masto = <a class="code" href="namespacemastodonpp.html">mastodonpp</a>;</div>
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<div class="line"><span class="keyword">using</span> json = nlohmann::json;</div>
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<div class="line"><span class="keyword">using</span> std::cerr;</div>
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<div class="line"><span class="keyword">using</span> std::cout;</div>
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<div class="line"><span class="keyword">using</span> std::exit;</div>
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<div class="line"><span class="keyword">using</span> std::string_view;</div>
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<div class="line"><span class="keyword">using</span> std::to_string;</div>
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<div class="line"><span class="keyword">using</span> std::vector;</div>
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<div class="line"> </div>
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<div class="line"><span class="keywordtype">void</span> handle_error(<span class="keyword">const</span> masto::answer_type &answer);</div>
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<div class="line"> </div>
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<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div>
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<div class="line">{</div>
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<div class="line"> <span class="keyword">const</span> vector<string_view> args(argv, argv + argc);</div>
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<div class="line"> <span class="keywordflow">if</span> (args.size() <= 1)</div>
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<div class="line"> {</div>
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<div class="line"> cerr << <span class="stringliteral">"Usage: "</span> << args[0] << <span class="stringliteral">" <instance hostname>\n"</span>;</div>
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<div class="line"> <span class="keywordflow">return</span> 1;</div>
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<div class="line"> }</div>
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<div class="line"> </div>
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<div class="line"> <span class="keywordflow">try</span></div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Initialize Instance and Connection.</span></div>
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<div class="line"> masto::Instance instance{args[1], {}};</div>
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<div class="line"> masto::Connection connection{instance};</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Get the last 4 public statuses of the instance.</span></div>
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<div class="line"> <span class="keyword">auto</span> answer{connection.get(masto::API::v1::timelines_public,</div>
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<div class="line"> {{<span class="stringliteral">"limit"</span>, <span class="stringliteral">"4"</span>}, {<span class="stringliteral">"local"</span>, <span class="stringliteral">"true"</span>}})};</div>
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<div class="line"> <span class="keywordflow">if</span> (answer)</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Parse JSON string.</span></div>
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<div class="line"> <span class="keyword">auto</span> statuses{json::parse(answer.body)};</div>
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<div class="line"> <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span> &status : statuses)</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Extract the info we want and print it.</span></div>
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<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> acct{status[<span class="stringliteral">"account"</span>][<span class="stringliteral">"acct"</span>].get<string_view>()};</div>
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<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> content{status[<span class="stringliteral">"content"</span>].get<string_view>()};</div>
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<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> <span class="keywordtype">id</span>{status[<span class="stringliteral">"id"</span>].get<string_view>()};</div>
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<div class="line"> cout << acct << <span class="stringliteral">" wrote status "</span> << <span class="keywordtype">id</span> << <span class="stringliteral">": \n"</span>;</div>
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<div class="line"> cout << <span class="stringliteral">" "</span> << content.substr(0, 76) << <span class="stringliteral">" …\n"</span>;</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Print tags if there are any.</span></div>
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<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> tags{status[<span class="stringliteral">"tags"</span>]};</div>
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<div class="line"> <span class="keywordflow">if</span> (!tags.empty())</div>
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<div class="line"> {</div>
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<div class="line"> cout << <span class="stringliteral">" Tags: "</span>;</div>
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<div class="line"> <span class="keywordflow">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span> &tag : tags)</div>
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<div class="line"> {</div>
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<div class="line"> cout << <span class="charliteral">'#'</span> << tag[<span class="stringliteral">"name"</span>].get<string_view>() << <span class="stringliteral">" "</span>;</div>
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<div class="line"> }</div>
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<div class="line"> cout << <span class="charliteral">'\n'</span>;</div>
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<div class="line"> }</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Print the number of attachments.</span></div>
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<div class="line"> <span class="keyword">const</span> <span class="keyword">auto</span> n_attachments{status[<span class="stringliteral">"media_attachments"</span>].size()};</div>
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<div class="line"> <span class="keywordflow">if</span> (n_attachments > 0)</div>
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<div class="line"> {</div>
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<div class="line"> cout << <span class="stringliteral">" "</span> << n_attachments << <span class="stringliteral">" attachment"</span>;</div>
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<div class="line"> <span class="keywordflow">if</span> (n_attachments > 1)</div>
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<div class="line"> {</div>
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<div class="line"> cout << <span class="stringliteral">"s"</span>;</div>
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<div class="line"> }</div>
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<div class="line"> cout << <span class="stringliteral">".\n"</span>;</div>
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<div class="line"> }</div>
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<div class="line"> }</div>
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<div class="line"> }</div>
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<div class="line"> <span class="keywordflow">else</span></div>
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<div class="line"> {</div>
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<div class="line"> handle_error(answer);</div>
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<div class="line"> }</div>
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<div class="line"> }</div>
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<div class="line"> <span class="keywordflow">catch</span> (<span class="keyword">const</span> masto::CURLException &e)</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Only libcurl errors that are not network errors will be thrown.</span></div>
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<div class="line"> <span class="comment">// There went probably something wrong with the initialization.</span></div>
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<div class="line"> cerr << e.what() << <span class="charliteral">'\n'</span>;</div>
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<div class="line"> }</div>
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<div class="line"> <span class="keywordflow">catch</span> (<span class="keyword">const</span> nlohmann::detail::exception &e)</div>
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<div class="line"> {</div>
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<div class="line"> cerr << <span class="stringliteral">"JSON exception: "</span> << e.what() << <span class="charliteral">'\n'</span>;</div>
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<div class="line"> }</div>
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<div class="line">}</div>
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<div class="line"> </div>
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<div class="line"><span class="keywordtype">void</span> handle_error(<span class="keyword">const</span> masto::answer_type &answer)</div>
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<div class="line">{</div>
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<div class="line"> <span class="keywordflow">if</span> (answer.curl_error_code == 0)</div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// If it is no libcurl error, it must be an HTTP error.</span></div>
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<div class="line"> cerr << <span class="stringliteral">"HTTP status: "</span> << answer.http_status << <span class="charliteral">'\n'</span>;</div>
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<div class="line"> }</div>
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<div class="line"> <span class="keywordflow">else</span></div>
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<div class="line"> {</div>
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<div class="line"> <span class="comment">// Network errors like “Couldn't resolve host.”.</span></div>
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<div class="line"> cerr << <span class="stringliteral">"libcurl error "</span> << to_string(answer.curl_error_code) << <span class="stringliteral">": "</span></div>
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<div class="line"> << answer.error_message << <span class="charliteral">'\n'</span>;</div>
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<div class="line"> }</div>
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<div class="line"> </div>
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<div class="line"> exit(1);</div>
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<div class="line">}</div>
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<div class="line"> </div>
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<div class="line"><span class="preprocessor">#else</span></div>
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<div class="line"> </div>
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<div class="line"><span class="preprocessor"># include <iostream></span></div>
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<div class="line"><span class="keywordtype">int</span> main()</div>
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<div class="line">{</div>
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<div class="line"> std::cout << <span class="stringliteral">"Example could not be compiled "</span></div>
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<div class="line"> <span class="stringliteral">"because nlohmann-json was not found.\n"</span>;</div>
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<div class="line">}</div>
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<div class="line"> </div>
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<div class="line"><span class="preprocessor">#endif // __has_include(<nlohmann/json.hpp>)</span></div>
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</div><!-- fragment --> </div><!-- contents -->
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<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:24</div></div>
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