Json

JsonCpp

下載：

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，解壓後直接把include與src複製到自己的項目下。

在項目中附加包含目錄：../include;../src/lib_json;

把兩個目錄中的文件添加到項目中

json_reader.cpp、json_value.cpp和json_writer.cpp三個文件的預編譯頭改成“不使用預編譯頭”

代碼：

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

發現JsonCpp竟然有內存泄露！！！可能我用法不對，放棄了。另外找了一個ggicci–json。

下載地址：

https://github.com/ggicci/ggicci–json

rapidjson

rapidjson更快,最終使用了rapidjson

下載地址：

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();