Am 11.11.2013 20:27, schrieb Michael Gius:
Hi List,
below code allows me to deserialize json like this:
{
"d_a": 24.25,
"d_b": 25.5,
"d_c": 23.2
}
but can I also use cxxtools to deserialize the following json array
into a vector of Mystruct (size unknown):
[
{
"d_a": 24.25,
"d_b": 25.5,
"d_c": 23.2
},
{
"d_a": 24.5,
"d_b": 25.5,
"d_c": 23.2
}
//more objects of the same type can follow
]
Thanks in advance for any pointers.
Best regards,
Michael
#include <iostream>
#include <cxxtools/jsondeserializer.h>
#include <cxxtools/serializationinfo.h>
struct Mystruct {
double d_a;
double d_b;
double d_c;
};
void operator<<= (cxxtools::SerializationInfo& si, const Mystruct&
mystruct)
{
si.addMember("d_a") <<= mystruct.d_a;
si.addMember("d_b") <<= mystruct.d_b;
si.addMember("d_c") <<= mystruct.d_c;
}
void operator>>= (const cxxtools::SerializationInfo& si, Mystruct&
mystruct)
{
si.getMember("d_a") >>= mystruct.d_a;
si.getMember("d_b") >>= mystruct.d_b;
si.getMember("d_c") >>= mystruct.d_c;
}
int main(int argc, char* argv[])
{
try
{
// define an empty mystruct object
Mystruct vmystruct;
// read json mystruct struct from stdin:
cxxtools::JsonDeserializer deserializer(std::cin);
deserializer.deserialize(vmystruct);
//for (unsigned n = 0; n < vmystruct.size(); ++n)
std::cout << vmystruct.d_a << ' ';
}
catch (const std::exception& e)
{
std::cerr << e.what() << std::endl;
}
}
just deserialize a std::vector of the struct:
int main(int argc, char* argv[])
{
try
{
std::vector<Mystruct> vmystruct;
// read json mystruct struct from stdin:
cxxtools::JsonDeserializer deserializer(std::cin);
deserializer.deserialize(vmystruct);
for (unsigned n = 0; n < vmystruct.size(); ++n)
std::cout << vmystruct[n].d_a << ' ';
}
catch (const std::exception& e)
{
std::cerr << e.what() << std::endl;
}
}
There is a predefined deserialization operator for std::vector<T> for
each type T, which is deserializable. You can also deserialize e.g. a
std::vector<std::pair<std::string, std::map<int, Mystruct> > > or some
other complex structure if you want.
Tommi
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