Question

Simple question: why the following code isn’t working? I would expect a string to be saved and read, but this just doesn’t happen…

#include <iostream>
#include <fstream>
using namespace std;

static string path = "/Users/john/Desktop/file";


main() {
string a;

a = "one\n";

fstream outStream(path.c_str(), ios::out | ios::binary);
outStream.write((char *) &a, sizeof(a));
outStream.close();

a = "two\n";

fstream inStream(path.c_str(), ios::in | ios::binary);
inStream.read((char *) &a, sizeof(a));
inStream.close();

cout << a;
return 0;}

Thanks a lot!

Answer 1

You cant write a string as a pointer. Either use the normal stream operators (<<) or use

outStream.write(a.c_str(), a.size());