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JsonCpp - JSON data format manipulation library
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<a href="http://sourceforge.net/projects/jsoncpp/">
JsonCpp project page
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<a href="http://jsoncpp.sourceforge.net">JsonCpp home page</a>
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<div class="title">JsonCpp Documentation</div> </div>
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<div class="textblock"><h2><a class="anchor" id="_intro"></a>
Introduction</h2>
<p><a href="http://www.json.org/">JSON (JavaScript Object Notation)</a> is a lightweight data-interchange format. It can represent integer, real number, string, an ordered sequence of value, and a collection of name/value pairs.</p>
<p>Here is an example of JSON data: </p>
<div class="fragment"><pre class="fragment">
// Configuration options
{
// Default encoding for text
"encoding" : "UTF-8",
// Plug-ins loaded at start-up
"plug-ins" : [
"python",
"c++",
"ruby"
],
// Tab indent size
"indent" : { "length" : 3, "use_space": true }
}
</pre></div><h2><a class="anchor" id="_features"></a>
Features</h2>
<ul>
<li>read and write JSON document</li>
<li>attach C and C++ style comments to element during parsing</li>
<li>rewrite JSON document preserving original comments</li>
</ul>
<p>Notes: Comments used to be supported in JSON but where removed for portability (C like comments are not supported in Python). Since comments are useful in configuration/input file, this feature was preserved.</p>
<h2><a class="anchor" id="_example"></a>
Code example</h2>
<div class="fragment"><pre class="fragment"><a class="code" href="class_json_1_1_value.html" title="Represents a JSON value.">Json::Value</a> root; <span class="comment">// will contains the root value after parsing.</span>
<a class="code" href="class_json_1_1_reader.html" title="Unserialize a JSON document into a Value.">Json::Reader</a> reader;
<span class="keywordtype">bool</span> parsingSuccessful = reader.<a class="code" href="class_json_1_1_reader.html#af1da6c976ad1e96c742804c3853eef94" title="Read a Value from a JSON document.">parse</a>( config_doc, root );
<span class="keywordflow">if</span> ( !parsingSuccessful )
{
<span class="comment">// report to the user the failure and their locations in the document.</span>
std::cout << <span class="stringliteral">"Failed to parse configuration\n"</span>
<< reader.<a class="code" href="class_json_1_1_reader.html#a95ab50aa789132e9dee0fc1475c85acf" title="Returns a user friendly string that list errors in the parsed document.">getFormattedErrorMessages</a>();
<span class="keywordflow">return</span>;
}
<span class="comment">// Get the value of the member of root named 'encoding', return 'UTF-8' if there is no</span>
<span class="comment">// such member.</span>
std::string encoding = root.<a class="code" href="class_json_1_1_value.html#a28282c9b76fa031eba7a1843c47c16fe" title="If the array contains at least index+1 elements, returns the element value, otherwise returns default...">get</a>(<span class="stringliteral">"encoding"</span>, <span class="stringliteral">"UTF-8"</span> ).<a class="code" href="class_json_1_1_value.html#a03ee3d5df576640c93ba683f140828bd">asString</a>();
<span class="comment">// Get the value of the member of root named 'encoding', return a 'null' value if</span>
<span class="comment">// there is no such member.</span>
<span class="keyword">const</span> <a class="code" href="class_json_1_1_value.html" title="Represents a JSON value.">Json::Value</a> plugins = root[<span class="stringliteral">"plug-ins"</span>];
<span class="keywordflow">for</span> ( <span class="keywordtype">int</span> index = 0; index < plugins.<a class="code" href="class_json_1_1_value.html#a4ca8ee6c48a34ca6c2f131956bab5e05" title="Number of values in array or object.">size</a>(); ++index ) <span class="comment">// Iterates over the sequence elements.</span>
loadPlugIn( plugins[index].asString() );
setIndentLength( root[<span class="stringliteral">"indent"</span>].<span class="keyword">get</span>(<span class="stringliteral">"length"</span>, 3).asInt() );
setIndentUseSpace( root[<span class="stringliteral">"indent"</span>].<span class="keyword">get</span>(<span class="stringliteral">"use_space"</span>, <span class="keyword">true</span>).asBool() );
<span class="comment">// ...</span>
<span class="comment">// At application shutdown to make the new configuration document:</span>
<span class="comment">// Since Json::Value has implicit constructor for all value types, it is not</span>
<span class="comment">// necessary to explicitly construct the Json::Value object:</span>
root[<span class="stringliteral">"encoding"</span>] = getCurrentEncoding();
root[<span class="stringliteral">"indent"</span>][<span class="stringliteral">"length"</span>] = getCurrentIndentLength();
root[<span class="stringliteral">"indent"</span>][<span class="stringliteral">"use_space"</span>] = getCurrentIndentUseSpace();
<a class="code" href="class_json_1_1_styled_writer.html" title="Writes a Value in JSON format in a human friendly way.">Json::StyledWriter</a> writer;
<span class="comment">// Make a new JSON document for the configuration. Preserve original comments.</span>
std::string outputConfig = writer.<a class="code" href="class_json_1_1_styled_writer.html#a56f0fd80f60272b3f3c85690aae66e7d" title="Serialize a Value in JSON format.">write</a>( root );
<span class="comment">// You can also use streams. This will put the contents of any JSON</span>
<span class="comment">// stream at a particular sub-value, if you'd like.</span>
std::cin >> root[<span class="stringliteral">"subtree"</span>];
<span class="comment">// And you can write to a stream, using the StyledWriter automatically.</span>
std::cout << root;
</pre></div><h2><a class="anchor" id="_pbuild"></a>
Build instructions</h2>
<p>The build instructions are located in the file <a href="README.txt">README.txt</a> in the top-directory of the project.</p>
<p>Permanent link to the latest revision of the file in subversion: <a href="http://jsoncpp.svn.sourceforge.net/viewvc/jsoncpp/trunk/jsoncpp/README.txt?view=markup">latest README.txt</a></p>
<h2><a class="anchor" id="_pdownload"></a>
Download</h2>
<p>The sources can be downloaded from <a href="http://sourceforge.net/projects/jsoncpp/files/">SourceForge download page</a>.</p>
<p>The latest version of the source is available in the project's subversion repository: <a href="http://jsoncpp.svn.sourceforge.net/svnroot/jsoncpp/trunk/">http://jsoncpp.svn.sourceforge.net/svnroot/jsoncpp/trunk/</a></p>
<p>To checkout the source, see the following <a href="http://sourceforge.net/scm/?type=svn&group_id=144446">instructions</a>.</p>
<h2><a class="anchor" id="_news"></a>
What's New?</h2>
<p>The description of latest changes can be found in <a href="NEWS.txt">NEWS.txt</a> in the top-directory of the project.</p>
<p>Permanent link to the latest revision of the file in subversion: <a href="http://svn.sourceforge.net/viewcvs.cgi/jsoncpp/README.txt?view=markup">latest NEWS.txt</a></p>
<h2><a class="anchor" id="_plinks"></a>
Project links</h2>
<ul>
<li><a href="http://jsoncpp.sourceforge.net">json-cpp home</a></li>
<li><a href="http://www.sourceforge.net/projects/jsoncpp/">json-cpp sourceforge project</a></li>
</ul>
<h2><a class="anchor" id="_rlinks"></a>
Related links</h2>
<ul>
<li><a href="http://www.json.org/">JSON</a> Specification and alternate language implementations.</li>
<li><a href="http://www.yaml.org/">YAML</a> A data format designed for human readability.</li>
<li><a href="http://www.cl.cam.ac.uk/~mgk25/unicode.html">UTF-8 and Unicode FAQ</a>.</li>
</ul>
<h2><a class="anchor" id="_license"></a>
License</h2>
<p>See file <a href="LICENSE">LICENSE</a> in the top-directory of the project.</p>
<p>Basically JsonCpp is licensed under MIT license, or public domain if desired and recognized in your jurisdiction.</p>
<dl class="author"><dt><b>Author:</b></dt><dd>Baptiste Lepilleur <<a href="mailto:blep@users.sourceforge.net">blep@users.sourceforge.net</a>> </dd></dl>
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