I\O Copy & Delete

thats say there are two files

file abc.txt

file def.txt

and i wann delete the contents in abc.txt and copy the contents in def.txt to abc.txt then delete the def.txt file

any function to do that?

Delete - see if either foo.empty() or foo.clear() works, I don't have a compiler on this computer so I can't find out that answer for you

Copy - Don't know of a function but you could try something like this

Code:

while (!infile.eof())
{
     outfile << infile.get();
}

Try:

Code:

#include <cstdio>  //For rename()
#include <windows.h>  //For DeleteFile() - Windows specific.

...
DeleteFile("abc.txt");
rename("def.txt", "abc.txt");

Look up unlink(). It's in cstdlib I believe.
Or, you could use remove() in cstdio.

Originally Posted by Hunter2

Try:

Code:

#include <cstdio>  //For rename()
#include <windows.h>  //For DeleteFile() - Windows specific.

...
DeleteFile("abc.txt");
rename("def.txt", "abc.txt");

i dont find there is rename for cstdio @@

In cstdio:

Code:

int remove(const char* filename);

Removes specified file. Returns non-zero on failure.

Originally Posted by sean_mackrory

Actually that's a windows function too.

u mean like this?
system ("del abc.txt");
system ("ren def.txt abc.txt");

however i am trying to find other way out

but thank you all

And actually I had to correct myself, I got myself mixed up. system() is a bad idea when there are more portable options. Have a look at http://www.cprogramming.com/tips/ to find out why, but until then - just use the functions suggested to you above.