파일 입출력 Binary

자료형이나 객체를 바이너리 파일로 입출력할 수 있다.

 

 int 자료형 입출력

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

int main()
{
    int i = 12;
    ofstream fileBinary("MyBinary.bin", ios_base::out | ios_base::binary);
//    fileBinary.write((const char *)(&i), sizeof(i));
    fileBinary.write(reinterpret_cast<const char *>(&i), sizeof(i));
    fileBinary.close();

    int getI;
    ifstream inputFileBinary("MyBinary.bin", ios_base::in | ios_base::binary);
    inputFileBinary.read(reinterpret_cast<char *>(&getI), sizeof(getI));
    cout << "getI: " << getI << endl;
    inputFileBinary.close();

    return 0;
}

 

객체 입출력

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

class Human
{
private:
    char *name;
    int age;
public:
    Human(){};
    Human(const char* inName, int intAge)
        :age(intAge)
    {
        name = new char[strlen(inName)];
        strcpy(name, inName);
    }
    ~Human()
    {
        delete[] name;
    }
    void ShowInfo()
    {
        cout << "이름: " << name << endl;
        cout << "나이: " << age << endl;
    }
};

int main()
{
    Human dae("daegil.kim", 25);
    dae.ShowInfo();

    ofstream fsOut("MyBinary.bin", ios_base::out | ios_base::binary);
    if (fsOut.is_open())
    {
        cout << "Writing one object of Human to a binary file" << endl;
        fsOut.write(reinterpret_cast<const char*>(&dae), sizeof(dae));
        fsOut.close();
    }

    ifstream fsIn("MyBinary.bin", ios_base::in | ios_base::binary);
    if (fsIn.is_open())
    {
        Human somePerson;
        cout << "Reading one object of Human from a binary file" << endl;
        fsIn.read(reinterpret_cast<char*>(&somePerson), sizeof(somePerson));

        somePerson.ShowInfo();
        fsIn.close();
    }

    return 0;
}