10-13-2016
C, UNIX: How to redirect 'stdout' to a file from a C code?
I am looking for a way to redirect standard output to a file from a C-code;
so, any 'cout<<..' or 'printf(...)' will be written into a file.
I have a server source that I need to debug.
That program called by RPC (remote procedure call) and has no any session to print out anything.
I have some my source with set of macro and functions that are useful for debugging any source; but, it is writing into the standard output.
Therefore I would like to redirect the stdout to a file to use those debug-tools into the server source.
How that could be done?
Thanks.
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LEARN ABOUT DEBIAN
onekey
FBB::OneKey(3bobcat) One keystroke input FBB::OneKey(3bobcat)
NAME
FBB::OneKey - Single keystroke input, not requiring `Return'
SYNOPSIS
#include <bobcat/onekey>
Linking option: -lbobcat
DESCRIPTION
OneKey objects may be used to realize `direct keyboard input': a pressed key becomes available without the need for pressing Enter. The
characters are obtained from the standard input stream. Direct key entry remains in effect for as long as the OneKey object exists. Once
the object is destroyed the standard input stream will return to its default mode of operation, in which input is `confirmed' by a newline
character.
NAMESPACE
FBB
All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB.
INHERITS FROM
-
ENUMERATION
The OneKey::Mode enumeration is used to control echoing of returned characters. It has two values:
o OFF: returned characters are not echoed to the standard output stream;
o ON: returned characters are echoed to the standard output stream.
CONSTRUCTORS
o OneKey(OneKey::Mode state = OneKey::OFF):
This constructor initializes the OneKey input object. By default, entered characters are not echoed. By constructing the object with
the OneKey::ON argument, entered characters are echoed to the standard output stream.
This construct throws an Errno exception if it not properly complete. The constructor may fail for the following reasons:
o the standard input stream is not a tty (e.g., when the standard input stream is redirected to a file);
o the current state of the standard input stream can't be determined;
o the standard input stream's state can't be changed to the `direct keyboard input' mode. The copy constructor (and the overloaded
assignement operator) are not available.
MEMBER FUNCTIONS
o int get() const:
Returns the next character from the standard input stream, without the need for pressing Enter.
o void setEcho(OneKey::Mode state):
Changes the echo-state of the OneKey object. The argument may be either OneKey::ON or OneKey::OFF.
o void verify() const:
Obsoleted, will be removed in a future Bobcat release.
EXAMPLE
/*
driver.cc
*/
#include <iostream>
#include <string>
#include <bobcat/onekey>
using namespace std;
using namespace FBB;
int main()
{
try
{
OneKey onekey;
onekey.verify();
cout << "Usage: 1: next chars are echoed, 0: no echo, q: quits
";
while (true)
{
char c;
cout << "ready...
";
cout << "Got character '" << (c = onekey.get()) << "'
";
switch (c)
{
case '1':
onekey.setEcho(OneKey::ON);
break;
case '0':
onekey.setEcho(OneKey::OFF);
break;
case 'q':
return 0;
}
}
}
catch (Errno const &e)
{
cout << e.why() << endl;
return e.which();
}
}
FILES
bobcat/onekey - defines the class interface
SEE ALSO
bobcat(7)
BUGS
None Reported.
DISTRIBUTION FILES
o bobcat_3.01.00-x.dsc: detached signature;
o bobcat_3.01.00-x.tar.gz: source archive;
o bobcat_3.01.00-x_i386.changes: change log;
o libbobcat1_3.01.00-x_*.deb: debian package holding the libraries;
o libbobcat1-dev_3.01.00-x_*.deb: debian package holding the libraries, headers and manual pages;
o http://sourceforge.net/projects/bobcat: public archive location;
BOBCAT
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
COPYRIGHT
This is free software, distributed under the terms of the GNU General Public License (GPL).
AUTHOR
Frank B. Brokken (f.b.brokken@rug.nl).
libbobcat1-dev_3.01.00-x.tar.gz 2005-2012 FBB::OneKey(3bobcat)