06-29-2008
Quote:
Originally Posted by
fox_hound_33
Hello all,
I need to develop an application that would be used as a simulator to test various custom algorithms. As I have never embarked on this kind of work, I need some advice:
1. Which GUI library to use in Linux, GTK+ or FLTK? The simulator application needs to output various non-standard GUI widgets like time line plots, various graphs like trees, bar charts, pie charts etc. The input from the user can also be visual, for example the user must be able to draw small circles or rectangles or arrows, drag to move these to a new location, expand/contract them etc. I guess these won't come already built-in, meaning, I will be coding them. In such a case which of the libraries would be easier? Or is there any library that has these non-standard features already built-in?
You may also want to look at Qt or wxWidgets
Quote:
2. C or C++? I have experience in C, however not much in C++. For the kind of application mentioned above which would offer a better, meaning, a more intuitive and flexible means of programming?
I believe the one you are more comfortable with.
Quote:
3. Does Linux have the equivalent of dll files as in Windows?
Thanks.
Yes, they are called shared objects files and with the extension .so
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LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS
--debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.8.4 2005-05-03 SHELL-QUOTE(1p)