JsonCpp Documentation
0.6.0-rc2
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.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 }}
- read and write JSON document
- attach C and C++ style comments to element during parsing
- rewrite JSON document preserving original comments
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.
The build instructions are located in the file in the top-directory of the project.root; // will contains the root value after parsing. reader;bool parsingSuccessful = reader.( 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.(); return;}// Get the value of the member of root named 'encoding', return 'UTF-8' if there is no// such member.std::string encoding = root.("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 plugins = root["plug-ins"];for ( int index = 0; index < plugins.(); ++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(); writer;// Make a new JSON document for the configuration. Preserve original comments.std::string outputConfig = writer.( 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;Permanent link to the latest revision of the file in subversion:
The sources can be downloaded from .The latest version of the source is available in the project's subversion repository:
To checkout the source, see the following .
The description of latest changes can be found in in the top-directory of the project.Permanent link to the latest revision of the file in subversion:
See file in the top-directory of the project.
- Specification and alternate language implementations.
- A data format designed for human readability.
- .
Basically JsonCpp is licensed under MIT license, or public domain if desired and recognized in your jurisdiction.
posted on 2013-06-21 10:44 阅读( ...) 评论( ...) 收藏