如何对接jsoncpp?
参考：https://www.cnblogs.com/cuish/p/3888657.html

下载源码

https://sourceforge.net/projects/jsoncpp/files/latest/download
https://sourceforge.net/projects/scons/files/latest/download

解压

$ ls
jsoncpp-src-0.5.0 
scons-2.3.4

编译脚本

cd jsoncpp-src-0.5.0
python ../scons-2.3.4/script/scons platform=linux-gcc
gccversion=`gcc --version | grep "^gcc"|awk ‘{print $3}‘`
libPath=`echo "linux-gcc-"${gccversion}`
cp -rf include/* /usr/local/include
cp -f  libs/${libPath}/*.a  /usr/local/lib/libjson.a
cd -

写个demo测试

(这个是抄别人的,网上有,省的自己写了,而且人家的demo写的还挺好的,一眼就让人知道怎么用了)

#include <stdio.h>
#include <unistd.h>
#include <iostream>
#include <string>
#include <json/json.h> 

using namespace std;

int main()
{ 

    string strStudent = "{ \"name\" : \"cuishihao\", \"age\" : 28, \"major\" : \"cs\" }";

    Json::Reader reader;
    Json::Value value;
    bool bRet = reader.parse(strStudent, value);
    if (false == bRet)
    {
        cerr << endl << "read value error \n";
        return -1;
    }

    cout << value["name"].asString()<<endl;
    cout << value["age"].asInt()<<endl;
    cout << value["major"].asString()<<endl;

    cout << endl;

    Json::Value json_temp;
    json_temp["name"] = Json::Value("cuihao");
    json_temp["age"] = Json::Value(28);

    Json::Value root;
    root["key_string"] = Json::Value("value_string");
    root["key_number"] = Json::Value(12345);
    root["key_boolean"] = Json::Value(true);
    root["key_double"] = Json::Value(12.345);
    root["key_object"] = json_temp;
    root["key_array"].append("array_string1");
    root["key_array"].append("array_string2");
    root["key_array"].append(12345);
    Json::ValueType type = root.type();

    Json::Value arrValue = root["key_array"];
    for (Json::Value::UInt i = 0; i < arrValue.size(); ++ i)
    {
        if (arrValue[i].isString()) 
            cout << arrValue[i].asString();

        else if (arrValue[i].isInt())
            cout << arrValue[i].asInt();

        cout << endl;
    }

    cout << endl << "----------------------------------- " <<endl;


    string strTemp =
        "{ \"name\" :  \"cuihao\" ,"         " \"age\" : 28 }";

    string strRoot = 
        "{ \"key_string\"  :  \"value_string\", "         "  \"key_number\"  :  28, "                       "  \"key_boolean\" :  false,  "                   "  \"key_double\"  :  12.345,  "                  "  \"key_object\"  :  json_temp, "                "  \"key_array\"   :  [\"array_string1\",  \"array_string2\", 12345]}";

    Json::StyledWriter writer;
    cout << endl << writer.write(root) << endl;

    cout << endl << "----------------------------"<<endl;
 
     
    Json::Value::Members members = root.getMemberNames();

    for(Json::Value::Members::const_iterator iter = members.begin();
        iter != members.end();
        ++ iter)
    {
        string strName = *iter; 
       
        if (root[strName].isInt())        
            cout << root[strName].asInt();
        
        else if (root[strName].isString()) 
            cout << root[strName].asString();

        else if (root[strName].isDouble()) 
            cout << root[strName].asDouble();

        else if(root[strName].isBool())
            cout << root[strName].asBool();

        else if(root[strName].isArray())
        {
            for(Json::Value::ArrayIndex i = 0; i < root[strName].size(); ++ i)
            { 
                if(root[strName][i].isInt())
                    cout << root[strName][i].asInt();
                else if(root[strName][i].isString())
                    cout << root[strName][i].asString();
                else 
                    cout << "others";

                cout << endl;
            }
        }
 
        else if (root[strName].isObject())
        {
            Json::Value::Members mbs = root[strName].getMemberNames();
            for (Json::Value::Members::const_iterator iter2 = mbs.begin();
                iter2 != mbs.end();
                ++ iter2)
            {
                string strName2 = *iter2;
                if(root[strName][strName2].isInt())
                    cout << root[strName][strName2].asInt();
                else if(root[strName][strName2].isString())
                    cout << root[strName][strName2].asString();
                else
                    cout << "others";

                cout << endl;  
            } //for
        } //else if
        else
            cout << "others";

        cout << endl;
    }

    return 0;
}

编译

g++ demo.cpp -I /usr/local/include/ -L/usr/local/lib/ -ljson -o demo
#或者
g++ demo.cpp -I /usr/local/include/ /usr/local/lib/libjson.a -o demo

运行

$ ./demo
cuishihao
28
cs

array_string1
array_string2
12345

----------------------------------- 

{
   "key_array" : [ "array_string1", "array_string2", 12345 ],
   "key_boolean" : true,
   "key_double" : 12.3450,
   "key_number" : 12345,
   "key_object" : {
      "age" : 28,
      "name" : "cuihao"
   },
   "key_string" : "value_string"
}


----------------------------
array_string1
array_string2
12345

1
12.345
12345
28
cuihao

value_string

如何对接jsoncpp?