Print to file in c++ - c++

Question

I have to print some objects fields to a file. I overloaded operator<<, and I have a method "draw" that uses it.
How can I print it to file?
ostream& operator <<(ostream& out, const Widget& obj)
{
int* colors2 = new int[3];
colors2 = obj.getbackgroundColor().getColor();
int* colors = new int[3];
colors = obj.getTextColor().getColor();
out << "[position (" << obj.getPosition().getX() << ","
<< obj.getPosition().getY() << ") ,";
out << "width (" << obj.getWidth() << ") ";
out << "height (" << obj.getHeight() << ") ,";
out << "text (" << obj.getText() << ") ,";
out << "colors (" << colors[0] << "," << colors[1] << "," << colors[2]
<< ") ,";
out << "background colors(" << colors2[0] << "," << colors2[1] << ","
<< colors2[2] << ") ,";
delete[] colors;
delete[] colors2;
return out;
}

Answer 1

You would want to use C++ ofstream (output file stream). You need to create an ofstream object, open the file you want to write to, and then you could use the default << operator already defined for output file stream in order to print to the file.
Take a look at the C++ documentation for ofstream; that should help you get a better understanding of file I/O.

Answer 2

Since you have operator<<() overloaded, use it:
std::ofstream my_file("data.s");
Widget w;
my_file << w;

Answer 3

The easy way to do this:
void draw(const std::string & filename)
{
std::ofstream file(filename.c_str()); //open a file for writing.
//Can use filename directly on newer compilers
file << wiget1; //use the << operator overload
file << wiget2;
...
}
The above version will open, overwrite, and close filename for every call to draw. This may not be what you want if you plan on having multiple calls to draw and the output of all those draws in the same file.
Rather than passing in the file name and opening file, you can open file elsewhere and pass it in to draw. This will allow multiple calls to draw for the same file.
Elsewhere:
std::ofstream file(filename.c_str());
new Draw:
void draw(std::ofstream & file)
{
file << wiget1; //use the << operator overload
file << wiget2;
...
}