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| -rw-r--r-- | examples/Makefile | 1 | ||||
| -rw-r--r-- | examples/howto-parse-args.cxx | 86 |
2 files changed, 87 insertions, 0 deletions
diff --git a/examples/Makefile b/examples/Makefile index c55891a3c..82f737e6e 100644 --- a/examples/Makefile +++ b/examples/Makefile @@ -1,6 +1,7 @@ include ../makeinclude ALL = howto-add_fd-and-popen$(EXEEXT) \ + howto-parse-args$(EXEEXT) \ tabs-simple$(EXEEXT) \ tree-simple$(EXEEXT) \ wizard-simple$(EXEEXT) diff --git a/examples/howto-parse-args.cxx b/examples/howto-parse-args.cxx new file mode 100644 index 000000000..e2d8d9f72 --- /dev/null +++ b/examples/howto-parse-args.cxx @@ -0,0 +1,86 @@ +// +// "$Id:$" +// +// How to parse command line arguments - Duncan Gibson 2010-10-23 +// First posted in http://www.fltk.org/newsgroups.php?gfltk.general+v:31449 +// +// Shows how to decode additional command line arguments using Fl::args() +// on top of the "standard" options used by the toolkit itself. +// +// Copyright 1998-2010 by Bill Spitzak and others. +// +// This library is free software; you can redistribute it and/or +// modify it under the terms of the GNU Library General Public +// License as published by the Free Software Foundation; either +// version 2 of the License, or (at your option) any later version. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// Library General Public License for more details. +// +// You should have received a copy of the GNU Library General Public +// License along with this library; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 +// USA. +// +// Please report all bugs and problems on the following page: +// +// http://www.fltk.org/str.php +// +#include <FL/Fl.H> +#include <FL/Fl_Box.H> +#include <FL/Fl_Window.H> +#include "stdio.h" +#include "string.h" + +int helpFlag = 0; +char *optionString = 0; + +int arg(int argc, char **argv, int &i) +{ + if (strcmp("-h", argv[i]) == 0 || strcmp("--help", argv[i]) == 0) { + helpFlag = 1; + i += 1; + return 1; + } + if (strcmp("-o", argv[i]) == 0 || strcmp("--option", argv[i]) == 0) { + if (i < argc-1 && argv[i+1] != 0) { + optionString = argv[i+1]; + i += 2; + return 2; + } + } + return 0; +} + +int main(int argc, char** argv) +{ + int i = 1; + if (Fl::args(argc, argv, i, arg) < argc) + // note the concatenated strings to give a single format string! + Fl::fatal("error: unknown option: %s\n" + "usage: %s [options]\n" + " -h | --help : print extended help message\n" + " -o | --option # : example option with parameter\n" + " plus standard fltk options\n", + argv[i], argv[0]); + if (helpFlag) + Fl::fatal("usage: %s [options]\n" + " -h | --help : print extended help message\n" + " -o | --option # : example option with parameter\n" + " plus standard fltk options:\n" + "%s\n", + argv[0], Fl::help); + + Fl_Window* mainWin = new Fl_Window(300, 200); + Fl_Box* textBox = new Fl_Box(0, 0, 300, 200); + if (optionString != 0) + textBox->label(optionString); + mainWin->show(argc, argv); + return Fl::run(); +} + +// +// End of "$Id:$". +// |