mirror of https://github.com/fltk/fltk
94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
//
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// "$Id$"
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//
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// How to parse command line arguments - Duncan Gibson 2010-10-23
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// First posted in http://www.fltk.org/newsgroups.php?gfltk.general+v:31449
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//
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// Shows how to decode additional command line arguments using Fl::args()
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// on top of the "standard" options used by the toolkit itself.
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//
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// Note that this only handles "option separateValue" rather than the
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// usual *nix idiom of "option=value", and provides no validation nor
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// conversion of the paramter string into ints or floats.
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//
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// Copyright 1998-2010 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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#include <stdio.h>
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#include <string.h>
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#include <FL/Fl.H>
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#include <FL/Fl_Box.H>
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#include <FL/Fl_Window.H>
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int helpFlag = 0;
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char *optionString = 0;
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/*
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* callback function passed to Fl::args() to parse individual argument.
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* If there is a match, 'i' must be incremented by 2 or 1 as appropriate.
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* If there is no match, Fl::args() will then call Fl::arg() as fallback
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* to try to match the "standard" FLTK parameters.
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*
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* Returns 2 if argv[i] matches with required parameter in argv[i+1],
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* returns 1 if argv[i] matches on its own,
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* returns 0 if argv[i] does not match.
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*/
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int arg(int argc, char **argv, int &i)
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{
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if (strcmp("-h", argv[i]) == 0 || strcmp("--help", argv[i]) == 0) {
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helpFlag = 1;
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i += 1;
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return 1;
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}
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if (strcmp("-o", argv[i]) == 0 || strcmp("--option", argv[i]) == 0) {
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if (i < argc-1 && argv[i+1] != 0) {
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optionString = argv[i+1];
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i += 2;
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return 2;
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}
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}
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return 0;
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}
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int main(int argc, char** argv)
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{
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int i = 1;
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if (Fl::args(argc, argv, i, arg) < argc)
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// note the concatenated strings to give a single format string!
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Fl::fatal("error: unknown option: %s\n"
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"usage: %s [options]\n"
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" -h | --help : print extended help message\n"
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" -o | --option # : example option with parameter\n"
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" plus standard fltk options\n",
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argv[i], argv[0]);
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if (helpFlag)
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Fl::fatal("usage: %s [options]\n"
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" -h | --help : print extended help message\n"
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" -o | --option # : example option with parameter\n"
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" plus standard fltk options:\n"
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"%s\n",
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argv[0], Fl::help);
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Fl_Window* mainWin = new Fl_Window(300, 200);
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Fl_Box* textBox = new Fl_Box(0, 0, 300, 200);
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if (optionString != 0)
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textBox->label(optionString);
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else
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textBox->label("re-run with [-o|--option] text");
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mainWin->show(argc, argv);
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return Fl::run();
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}
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//
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// End of "$Id$".
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//
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