Reading/ Writing from/to a file

Question

I am working on an OOP project and I need to write into a file and I faced a problem that each time I do it the file is over written with only one object. How can I make it to write data of all the objects? I tried this but didnt work.

virtual void save(ofstream outfile) = 0;`// the base class

void AND2::save(ofstream outf) //derived
{
    outf.open("test.txt");
    outf << Component::getype() << " ";
    outf<< Component::getid() << " ";
    outf << Component:: graphicsinfomration().x1 << " ";
    outf<< Component::graphicsinfomration().x2 << " ";
    outf << graphicsinfomration().y1 << " ";
    outf << graphicsinfomration().y2 << " ";
    outf << endl;
    outf.close();
}
else          
{
    ofstream outf;
    for (int i = 0; i < (pApp->getcompcount()); i++)
    {
        //ask user to enter text name
        c[i]->save( outf);
    }
    pOut->ClearStatusBar();
}

Answer 1

Because you're opening the file again and again you overwrite the contents again and again.

You probably want to open the stream outside the for loop once and pass it by reference.