Re: I want to write a simple log file app in c++

From:

=?ISO-8859-1?Q?Erik_Wikstr=F6m?= <Erik-wikstrom@telia.com>

Newsgroups:

comp.lang.c++

Date:

Sun, 12 Aug 2007 22:57:34 GMT

Message-ID:

<yfMvi.6087$ZA.2760@newsb.telia.net>

On 2007-08-12 19:15, Jorgen Grahn wrote:

On Sat, 11 Aug 2007 19:19:25 GMT, Erik Wikstr?m <Erik-wikstrom@telia.com> wrote:

On 2007-08-11 20:33, CodeGrommet wrote:

I'm testing out the system() command. I coded the following. How can
I output the results into the given output file? Your help will be
appreciated.

Generally, system() should be avoided. If you have to execute external
programs uses some of the platform-specific sys-calls designed for this
purpose.

I'd put it this way: if you're going to use system(), be aware how it
works on your target platforms. It's not trivial, with the
interactions with the Unix shell and everything ...

If you want to keep the code portable stick to the sys-calls
defined in POSIX, such as exec() etc.

But they are messy (and POSIX-specific).

Someone should (or maybe already has?) implement the popen/subprocess
stuff from Python -- some kind of limited portability, but also access
to the best the OS can provide.

A bit off-topic, but ever tried man 3 popen on a POSIX compatible
machine? It's a but limited since it's only one way communication but I
seem to recall that you can create your own two-way communication popen
quite easily.

--
Erik Wikstr?m