7、JsonCpp简单使用(3)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <vector>
#include <iostream>
#include "json/json.h"
using namespace std;

typedef struct piece 
{
string letter;
string wild;    
}piece;

string encode_msg(string token,int game_id,vector<piece> piece_array)
{
//Json::Value root;
    Json::Value var;
//apply “token” and “game_id” value to json struct
    var["token"] = token;
var["game_id"] = game_id;

    Json::Value pieces;//store all pieces
    for (int i=0;i < piece_array.size();i++)
    {
        Json::Value piece_ex;//here it store just one piece
//next 4 lines to apply piece value to json struct
        piece_ex["letter"] = piece_array[i].letter;
        piece_ex["wild"] = piece_array[i].wild;
//ok,yes we just have apply One piece ,then push back to the array
        pieces.append(piece_ex);
    }
var["piece_array"] = pieces;//yes,store pieces in var [Value]
//root.append(var);

    Json::FastWriter writer;
return writer.write(var);//generate json string:),here all is done
}
int main()
{
    piece one, two;
    one.letter = "1";
    one.wild = "ont";
    two.letter = "2";
    two.wild = "two";
    vector<piece> myp;
    myp.push_back(one);
    myp.push_back(two);
string ret = encode_msg("mytoken", 123, myp);
    cout << ret << endl;
return 1;
}

{"game_id":123,"piece_array":[{"letter":"1","wild":"ont"},{"letter":"2","wild":"two"}],"token":"mytoken"}

// 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.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;