How to convert binary files context into int/long value in C++ - c++

Question

I am storing a value in a binary file with fstream. The value is unsigned short type.
unsigned shord value=1750; //2 byte variable
file.write((char*)&value,sizeof(value));
My problem is that I want to read this binary file in another function, but it gives me some weird symbols (Obviously because it is binary).
Is there any way to get those two bytes and convert them to my old value (1750) ?
Here's what I have tried:
cout <<(unsigned short)(unsigned char)(s2[8]);//s2 variable where the whole body is stored
cout <<(unsigned short)(char*)(s2[8]);
I have tried other things, too, but they were just chickenscratch and aren't worth including here.

Answer 1

Here's how you might do it (note uses C++11 features):
#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
void write_shorts(string filename, vector<unsigned short> shorts)
{
ofstream f;
f.open(filename, ofstream::trunc|ofstream::binary);
for(auto s: shorts)
f.write(reinterpret_cast<char*>(&s), sizeof(s));
}
auto read_shorts(string filename)
{
ifstream f(filename);
vector<unsigned short> res;
short x;
while(f.read(reinterpret_cast<char*>(&x), sizeof(x)))
res.push_back(x);
return res;
}
int main()
{
// Write 3 shorts to a file
write_shorts("myshorts", {4711, 1, 0xffff});
// Read them back into a vector
auto v = read_shorts("myshorts");
cout << "Read " << v.size() << "shorts: " << endl;
for(auto x: v)
cout << x << endl;
}