It is best to create a file stream object at any time. Do not become a class member.

Source: Internet
Author: User

Class is better not to own fstream members:

The opening, closing, and other operations of file objects are prone to Imperceptible operation failures due to various environmental changes in the runtime.

This makes the test difficult.

 

Therefore, it is best to use the file stream object as needed.

For example, if the function body of the function Member of the next object is more desirable, the fstream object OUTFILE is not a member of the class.

Fstream OUTFILE;
OUTFILE. Open (fname, IOS: Binary | IOs: APP );
If (OUTFILE. Fail ())
{
Cout <"can't open file! "<Endl;
Return;
}
OUTFILE. seekp (0, IOS: End );
T. writetofile (OUTFILE );
OUTFILE. Close ();

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