Json

JsonCpp

下载：

https://github.com/open-source-parsers/jsoncpp

https://sourceforge.net/projects/jsoncpp/

https://github.com/open-source-parsers/jsoncpp/archive/1.7.4.zip

使用：

配置：

本人使用的是JsonCpp1.7.4，解压后直接把include与src复制到自己的项目下。

在项目中附加包含目录：../include;../src/lib_json;

把两个目录中的文件添加到项目中

json_reader.cpp、json_value.cpp和json_writer.cpp三个文件的预编译头改成“不使用预编译头”

代码：

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;

ggicci–json

发现JsonCpp竟然有内存泄露！！！可能我用法不对，放弃了。另外找了一个ggicci–json。

下载地址：

https://github.com/ggicci/ggicci–json

rapidjson

rapidjson更快,最终使用了rapidjson

下载地址：

https://github.com/miloyip/rapidjson/

使用方法：

#include "rapidjson/document.h"using namespace rapidjson;CString strTemp = _T("{\"form\": \"sysAdmin\",\"to\":\"caoyh\",\"msg\": \"NewPic\"}");CString strForm, strTo;Document json;json.Parse(strTemp);strForm = json[_T("form")].GetString();strTo = json[_T("to")].GetString();strMsg = json[_T("msg")].GetString();