(How do )I set EOF to an ofstream obj

[Guest_imported]

I wish to use ofstream::seekp() to point and set
there the new EOF, but...

I tried:
{
ofstream o("blah.txt", ios::in | ios:ut);

o.seekp(-30L, ios::end);
//set the ptr 30 bytes back from EOF.
//I want to set (the new) EOF HERE!
}
10x.

 

[joeGrammar]

I don't understand your logic, why do you want to do this?

 

[Cagliostro]

Joe, maybe he/she wants to truncate file? I don't know how to do it, but is possible by copying needed amount of data in other file and remove or leave the old one. John Fill

ivfmd@mail.md