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
";
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