C++的JSON开发包 JsonCpp
openkk
13年前
JsonCpp 是一个 C++ 用来处理 JSON 数据的开发包。 <h3><a class="anchor" name="_features">功能特性:</a></h3> <ul> <li>读和写JSON文档</li> <li>在解析的时候添加C 和 C++ 风格的注释</li> <li>rewrite JSON document preserving original comments</li> </ul> <p>示例代码:</p> <pre class="brush:cpp; toolbar: true; auto-links: false;">Json::Value root; // will contains the root value after parsing. Json::Reader reader; bool parsingSuccessful = reader.parse( config_doc, root ); if ( !parsingSuccessful ) { // report to the user the failure and their locations in the document. std::cout << "Failed to parse configuration\n" << reader.getFormattedErrorMessages(); return; } // Get the value of the member of root named 'encoding', return 'UTF-8' if there is no // such member. std::string encoding = root.get("encoding", "UTF-8" ).asString(); // Get the value of the member of root named 'encoding', return a 'null' value if // there is no such member. const Json::Value plugins = root["plug-ins"]; for ( int index = 0; index < plugins.size(); ++index ) // Iterates over the sequence elements. loadPlugIn( plugins[index].asString() ); setIndentLength( root["indent"].get("length", 3).asInt() ); setIndentUseSpace( root["indent"].get("use_space", true).asBool() ); // ... // At application shutdown to make the new configuration document: // Since Json::Value has implicit constructor for all value types, it is not // necessary to explicitly construct the Json::Value object: root["encoding"] = getCurrentEncoding(); root["indent"]["length"] = getCurrentIndentLength(); root["indent"]["use_space"] = getCurrentIndentUseSpace(); Json::StyledWriter writer; // Make a new JSON document for the configuration. Preserve original comments. std::string outputConfig = writer.write( root ); // You can also use streams. This will put the contents of any JSON // stream at a particular sub-value, if you'd like. std::cin >> root["subtree"]; // And you can write to a stream, using the StyledWriter automatically. std::cout << root;</pre> <p><strong>项目主页:</strong><a href="http://www.open-open.com/lib/view/home/1324129892062" target="_blank">http://www.open-open.com/lib/view/home/1324129892062</a></p> <p></p>