Re: write to the console
Re: write to the console
- Subject: Re: write to the console
- From: Chris Kane <email@hidden>
- Date: Wed, 23 Apr 2003 11:47:38 -0700
NSLog() and fprintf(stderr, ...) are both sending output to the same
place, the stderr file of your process. When you run in a shell in a
Terminal window, this output goes to the shell which spews it on to
Terminal. (Well, that's somewhat simplified...) When you run, say, an
app by double-click, it's stderr is redirected by "Finder" (it's
perhaps simplest to think of Finder running the program, though that's
not correct) as it is started, to point to /var/tmp/console.log (and
again, this is not actually what is going on, but it's a much
easier-to-understand explanation).
Look at freopen() in the stdio subsystem (see the man page), as a
reasonable way to point your stderr at /var/tmp/console.log. Of
course, it is always possible that the OS may change the name of that
file in the future or put it somewhere else. Using freopen you can
point stderr at whatever file you like, it wouldn't have to be the
console log. Remember to use an append-without-truncation option, or
you'll be blowing away the file when you run your tool.
You may only want to redirect your stderr when it is going to a
Terminal or remote-logged-in-shell or similar. The simplest way to
detect this is to use the often-overlooked function isatty() (again,
see the man page) with STDERR_FILENO as the argument (<unistd.h>).
Chris Kane
Cocoa Frameworks, Apple
On Tuesday, April 22, 2003, at 23:40, Lloyd Dupont wrote:
well, I'm testing with a simple tool.
when I invoke it from the terminal NSLog() write in my terminal, but
there is no output in the system console.
I tried fprintf(stderr, ...); too, but it doesn't work either ...
On Wednesday, April 23, 2003, at 04:34 PM, email@hidden wrote:
NSLog() is what I use
On Wed, 23 Apr 2003 16:19:34 +1000, Lloyd Dupont wrote:
how to write to the console ?
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