how save a structure object on a file and read it?

[Cambalinho]

see these code:

struct user
{
    string name;
    string  adress;
    image foto;//i must overloading ofstream and ifstream operators
    int age=0;
};

user usrName[2];
user usrName2[2];

//save a structure object to a file
template<typename structure>
void SaveDataBase(string filename,structure &StructureVariable )
{
    remove(filename.c_str());
    ofstream writefile;
    writefile.open(filename.c_str(), ios::out | ios::binary);
    writefile.write (reinterpret_cast<char*>(StructureVariable),sizeof(structure));
    writefile.close();
}

//read a structure object from a file
template<typename structure>
void ReadDataBase(string filename,structure &StructureVariable )
{
    ifstream readfile;
    readfile.open(filename.c_str(), ios::out | ios::binary);
    readfile.read (reinterpret_cast<char*>(StructureVariable),sizeof(structure));
    readfile.close();
}

on my image class i'm trying overloading ofstream\ifstream operators:

friend ofstream& operator << (ofstream &os, const image &img2)
    {
        int stringsize=img2.strfilename.size()+1;
        char chrFileName[img2.strfilename.size()+1];
        sprintf(chrFileName,"%s",img2.strfilename.c_str());
        os << stringsize << chrFileName;
        return os;
    }

    friend ifstream& operator >> (ifstream &is, image &img2)
    {
        DebugText("reading file");
        int stringsize;
        is >>stringsize;
        char chFileName[stringsize];
        is >>chFileName;
        img2.readimagefile(chFileName);
        DebugText("end of reading file");
        return is;
    }

but why these overloading operators aren't called?
i'm doing something wrong, but i'm confused
my objective is overloading the ofstream.write() and ifstream.read().
i can save the usrName on a file and read it to usrName2. but when i close the application, the Windows give me an error: 'the program stop responding' and then close it. i'm trying fix these error

[monarch_dodra]

You are not calling the overload because for the simple reasons that:
1. You are casting your object's address to char*, doing a raw read/wrtie, meaning you never actually call anything on it.
2. You are never calling << or >> anyways.

Note that what you are doing will virtually never work, as you are writing the literal memory contents of your object. The issue is that:
1. It's layout is depends on the platform and release the binary was compiled with. Even on a same machine!
2. It completely bypasses constructors on reading, potentially filling your objects with junk.
3. It has no knowledge of memory layout: A string is usually a pointer to a char buffer, but all you will be saving is a pointer (utterlly useless).

I suggest you read about: http://www.parashift.com/c++-faq/serialization.html

Using an actual serizalization library could help, in particular, http://www.boost.org/doc/libs/1_59_0...doc/index.html

If this is meant for class, or something very lightweight, then I'd suggest you simply go for something more like a CSV/TSV.