Here is an example of JSON data:
// 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 } }
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.getFormatedErrorMessages(); 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 explicitely 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 );
Permanent link to the lastest revision of the file in subversion: lastest README.txt