Read/Write struct containing string property to binary file

Question

I am running in to an issue while reading/writing a struct having complex data specifically string. my struct looks like below.

struct MyRecord {
  char name[80]         


        

Answer 1

Add these two functions

std::ostream & operator << ( std::ostream & os, const MyRecord & rec ) {
    os.write( rec.name, sizeof( rec.name ) );
    size_t sz = rec.location.size();
    os.write( & sz, iszeof( sz ) );
    os.write( rec.location.c_str(), sz );
    os.write( (char*) & balance, sizeof( rec.balance ) );
    os.write( (char*) & account_num, sizeof( rec.account_num ) );
    return os;
}
std::istream & operator >> ( std::ostream & is, MyRecord & rec ) {
    is.read( rec.name, sizeof( rec.name ) );
    size_t sz;
    is.read( & sz, iszeof( sz ) );
    rec.resize( sz );
    if ( sz != 0 ) {
        is.read( & rec.location[ 0 ], sz );
    }
    is.read( (char*) & balance, sizeof( rec.balance ) );
    is.read( (char*) & account_num, sizeof( rec.account_num ) );
}

And here is a usage

ofstream outbal("balance", ios::out | ios::binary);
outbal << acc;

ifstream inbal("balance", ios::in | ios::binary);
inbal >> acc;

This is poor handmade similarity of Boost.Serialization. Indeed, it would be better to use boost, then my vehicle.