Am 25.04.2013 11:47, schrieb Jean-Michel Caricand:
> Hello,
>
> I have this json string : { "a": 10, "b": { "c": "AZERTY", "d": "QWERTY" } }
>
> Without struct or C++ class, I want to get b's value as std::string. I
> tried :
>
> #include <iostream>
> #include <fstream>
> #include <cxxtools/jsondeserializer.h>
>
> int main()
> {
> std::string s("{ \"a\": 10, \"b\": { \"c\": \"AZERTY\", \"d\":
> \"QWERTY\" } }");
> std::stringstream is(s);
> cxxtools::JsonDeserializer deserializer(is);
>
> cxxtools::SerializationInfo si;
> deserializer.deserialize(si, "b");
>
> std::string b1;
> si.getMember("c") >>= b1; // ----> OK :)
>
> std::cout << "b1: " << b1 << std::endl;
>
> std::string b2;
> deserializer.deserialize(b2, "b"); // ----> NOT OK, b2 is empty :(
>
> std::cout << "b2: " << b2 << std::endl;
> }
>
> Is it possible to get b's value as string ?
>
> Thanks,
>
> Jean-Michel
>
Hello again,
let me add some hint. I really suggest not to use SerializationInfo
directly. It is much easier to use the serialization framework. Here is
a example based on the code above, how to do it:
#include <iostream>
#include <cxxtools/jsondeserializer.h>
#include <cxxtools/jsonserializer.h>
struct B
{
std::string c;
std::string d;
};
void operator>>= (const cxxtools::SerializationInfo& si, B& b)
{
si.getMember("c") >>= b.c;
si.getMember("d") >>= b.d;
}
void operator<<= (cxxtools::SerializationInfo& si, const B& b)
{
si.addMember("c") <<= b.c;
si.addMember("d") <<= b.d;
}
struct A
{
int a;
B b;
};
void operator>>= (const cxxtools::SerializationInfo& si, A& a)
{
si.getMember("a") >>= a.a;
si.getMember("b") >>= a.b;
}
void operator<<= (cxxtools::SerializationInfo& si, const A& a)
{
si.addMember("a") <<= a.a;
si.addMember("b") <<= a.b;
}
int main()
{
try
{
std::string s("{ \"a\": 10, \"b\": { \"c\": \"AZERTY\", \"d\":
\"QWERTY\" } }");
std::istringstream is(s);
cxxtools::JsonDeserializer deserializer(is);
A a;
deserializer.deserialize(a);
std::cout << "a=" << a.a << "\n"
<< "b.c=" << a.b.c << "\n"
<< "b.d=" << a.b.d << "\n";
std::cout << "json again:\n";
cxxtools::JsonSerializer serializer(std::cout);
serializer.beautify(true);
serializer.serialize(a).finish();
}
catch (const std::exception& e) // always good to catch all
exceptions
{
std::cerr << e.what() << std::endl;
}
}
You just need to write the deserialization and serialization operators.
I started to write a howto for the serialization framework but I'm not
finished with it. But that is a nice example for it. Thank you for that.
Tommi
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