DynamicStruct // 会排序 ,基于map
OrderedDynamicStruct / /不会排序 ,基于队列 dqueue
typedef Dynamic::Struct < std::string> DynamicStruct;
typedef Dynamic::Struct<std::string, Poco::OrderedMap<std::string, Dynamic::Var>, Poco::OrderedSet< std::string>> OrderedDynamicStruct;
template <typename K, typename M = std::map<K, Var>, typename S = std::set>
class Struct
1、map2json 流程
map–>DynamicStruct 或 OrderedDynamicStruct -->调用tostring函数
//map2json
std::map<string, int> stMap;
stMap["a1"] = 100;
stMap["a2"] = 99;
stMap["a0"] = 20;
//存在map 和 ordermap 的构造函数
DynamicStruct aStruct(stMap);
cout << aStruct.toString() << endl;
OrderedMap <string, int> st2Map;
st2Map["a1"] = 100;
st2Map["a2"] = 99;
st2Map["a0"] = 20;
OrderedDynamicStruct aStruct2(st2Map);
cout << aStruct2.toString() << endl;
void VarTest::testStructToString()
{
DynamicStruct aStruct;
aStruct["First Name"] = "Junior";
aStruct["Last Name"] = "POCO";
aStruct["Age"] = 1;
Var a1(aStruct);
std::string res = a1.convert<std::string>();
std::string expected = "{ \"Age\" : 1, \"First Name\" : \"Junior\", \"Last Name\" : \"POCO\" }";
assertTrue (res == expected);
assertTrue (aStruct.toString() == res);
}
void VarTest::testOrderedStructToString()
{
OrderedDynamicStruct aStruct;
aStruct["First Name"] = "Junior";
aStruct["Last Name"] = "POCO";
aStruct["Age"] = 1;
Var a1(aStruct);
std::string res = a1.convert<std::string>();
std::string expected = "{ \"First Name\" : \"Junior\", \"Last Name\" : \"POCO\", \"Age\" : 1 }";
assertTrue(res == expected);
assertTrue(aStruct.toString() == res);
}
2、json2map 流程
json–>parser–>var -->var的函数 extract(可以为对象或数组)–> 转换成DynamicStruct 或 OrderedDynamicStruct --> 通过赋值给map
std::string json = "{ \"name\" : \"Franky\", \"children\" : [ \"Jonas\", \"Ellen\" ] }";
Parser parser;
Var result;
try
{
result = parser.parse(json);
}
catch (JSONException& jsone)
{
std::cout << jsone.message() << std::endl;
}
//如果是对象的话,就使用这个
Object::Ptr object = result.extract<Object::Ptr>();
//下面之所以能够这样做,因为重载了 Poco::OrderedDynamiStruct 和 const Poco::DynamicStruct& (),
//可以可以赋值
//,C++中没有返回类型的函数有3个,构造函数、析构函数、类型转换函数
const DynamicStruct &ds = *object;
std::map<string, Var> st3Map;
Object::ConstIterator iter = ds.begin();
for (; iter != ds.end(); ++iter)
{
const string& key = iter->first;
const Var& var = iter->second ;
//在这里转换
st3Map[key] = var;
}
for (auto& m : st3Map)
{
cout << m.first << ": " << m.second.toString() << endl ;
}