C++ Read and write multiple objects of same class

Question

airport air(1,2,3); //an airport constructor
ofstream myfile;
myfile.open(\"rishab\",ios::app||ios::binary);
myfile.write((char*)air,sizeof(airport);
myfile.close();         


        

Answer 1

What you are trying to do is serialization. This way of serializing objects is not stable, and highly depends on what airport is. It's better to use explicit serialization.

Here's a description of what serialization is and why is it made this way.

In MessagePack a typical serialization-deserialization scenario would look like this:

struct airport {
 std::string name; //you can name your airports here
 int planeCapacity;
 int acceptPlanesFrom;
 MSGPACK_DEFINE(name,planeCapacity,acceptPlanesFrom);
};

...

// define your airports
std::vector airports;
airport a={"BLA",1,2};
airport b={"BLB",3,4};
airports.push_back(a);
airports.push_back(b);

// create a platform-independent byte sequence from your data
msgpack::sbuffer sbuf;
msgpack::pack(sbuf, airports) ;
std::string data=sbuf.data();//you can write that into a file

msgpack::unpacked msg;
// get your data safely back
msgpack::unpack(&msg, sbuf.data(), sbuf.size());
msgpack::object obj = msg.get();

std::cout< read_airports;
obj.convert(&read_airports);
std::cout<

with the console output:

[["BLA", 1, 2], ["BLB", 3, 4]]
2

• some more