redirecting stdin and stdout programatically

[Get_Free]

In order to redirect stdin and stdout in a shell environment I just do this:
./exefile < file.in >file.out

But how can I do this programatically, inside the program, that is, that a program redirect itself its own stdin and stdout??

thanx.

[SuperKoko]

There is no standard way, but OS specific ways.
Under Win32, you can use
SetStdHandle (http://msdn.microsoft.com/library/en-us/dllproc/base/setstdhandle.asp)

Or, when you launch another process, CreateProcess has a STARTUPINFO structure containing a flag, and fields for redirecting stdout, stdin, and stderr.

[earl]

If we're talking UNIX, look into the dup2() function. You can duplicate open file descriptors (file.in and file.out) across the stdin and stdout descriptors (0 and 1, or STDIN_FILENO and STDOUT_FILENO).

[Improving]

It can be done standardly (http://www.cuj.com/documents/s=7997/cujcexp1903hyslop/)

[Get_Free]

It can be done standardly (http://www.cuj.com/documents/s=7997/cujcexp1903hyslop/)
hehe, just that simple, assign a new stream to cin, cout and cerr :)

[Improving]

read it all.

[Get_Free]

read it all.
Oh, my mistake.
anyway... it can be done, that's the good thing