Yes, you can redirect it to an std::stringstream: std::stringstream buffer; std::streambuf * old = std::cout.rdbuf(buffer.rdbuf()); std::cout << “Bla” << std::endl; std::string text = buffer.str(); // text will now contain “Bla\n” You can use a simple guard class to make sure the buffer is always reset: struct cout_redirect { cout_redirect( std::streambuf * new_buffer ) : old( … Read more
popen gives you a file handle on a process’ stdout, not its stderr. Its first argument is interpreted as a shell command, so you can do redirections in it: FILE *p = popen(“prog 2>&1”, “r”); or, if you don’t want the stdout at all, FILE *p = popen(“prog 2>&1 >/dev/null”, “r”); (Any other file besides … Read more
You can use the backtics to execute your external program and capture its stdout and stderr. By default the backticks discard the stderr and return only the stdout of the external program.So $output = `cmd`; Will capture the stdout of the program cmd and discard stderr. To capture only stderr you can use the shell’s … Read more
update-client 2>&1 | tee my.log 2>&1 redirects standard error to standard output, and tee sends its standard input to standard output and the file.
You can do this with subprocess, but it’s not trivial. If you look at the Frequently Used Arguments in the docs, you’ll see that you can pass PIPE as the stderr argument, which creates a new pipe, passes one side of the pipe to the child process, and makes the other side available to use … Read more
If you have a Fortran 2003 compiler, the intrinsic module iso_fortran_env defines the variables input_unit, output_unit and error_unit which point to standard in, standard out and standard error respectively. I tend to use something like #ifdef f2003 use, intrinsic :: iso_fortran_env, only : stdin=>input_unit, & stdout=>output_unit, & stderr=>error_unit #else #define stdin 5 #define stdout 6 … Read more
I have a piece of software I wrote for work that captures stderr to a file like so: import sys sys.stderr = open(‘C:\\err.txt’, ‘w’) so it’s definitely possible. I believe your problem is that you are creating two instances of writer. Maybe something more like: import sys class writer(object): log = [] def write(self, data): … Read more
To redirect the stdout to stderr, use your command as follows :- $ command-name 1>&2 where command-name is the command you’re going to feed, 1 represents stdout and 2 represents stderr .
For example: PSKILL NOTEPAD >output.txt 2>&1 This will direct stdout and stderr to a file name output.txt. See Underused features of Windows batch files for more details.
This seems to do what I want: #!/usr/bin/python import sys import logging class InfoFilter(logging.Filter): def filter(self, rec): return rec.levelno in (logging.DEBUG, logging.INFO) logger = logging.getLogger(“__name__”) logger.setLevel(logging.DEBUG) h1 = logging.StreamHandler(sys.stdout) h1.setLevel(logging.DEBUG) h1.addFilter(InfoFilter()) h2 = logging.StreamHandler() h2.setLevel(logging.WARNING) logger.addHandler(h1) logger.addHandler(h2)