parse-argv1.cpp

Example of command line parsing.

/****************************************************************************
 *
 * This file is part of the ViSP software.
 * Copyright (C) 2005 - 2017 by Inria. All rights reserved.
 *
 * This software is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * ("GPL") version 2 as published by the Free Software Foundation.
 * See the file LICENSE.txt at the root directory of this source
 * distribution for additional information about the GNU GPL.
 *
 * For using ViSP with software that can not be combined with the GNU
 * GPL, please contact Inria about acquiring a ViSP Professional
 * Edition License.
 *
 * See http://visp.inria.fr for more information.
 *
 * This software was developed at:
 * Inria Rennes - Bretagne Atlantique
 * Campus Universitaire de Beaulieu
 * 35042 Rennes Cedex
 * France
 *
 * If you have questions regarding the use of this file, please contact
 * Inria at visp@inria.fr
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Description:
 * Example of  command line parsing.
 *
 * Author:
 * Fabien Spindler
 *
 *****************************************************************************/

#include <visp3/core/vpDebug.h>
#include <visp3/io/vpParseArgv.h>
#include <stdlib.h>
#include <stdio.h>
#include <sstream>
#include <iomanip>
// List of allowed command line options
#define GETOPTARGS  "d:f:i:h"

void usage(const char *name, const char *badparam, int i_val, float f_val, double d_val);
bool getOptions(int argc, const char **argv, int &i_val, float &f_val, double &d_val);

void usage(const char *name, const char *badparam, int i_val, float f_val, double d_val)
{
  fprintf(stdout, "\n\
Parsing command line arguments example.\n\
\n\
SYNOPSIS\n\
  %s [-i <integer>] [-f <float>] [-d <double> [-h]\n\
", name);

  fprintf(stdout, "\n\
OPTIONS:                                               Default\n\
  -i <integer>                                         %d\n\
     An integer value.\n\
\n\
  -f <float>                                           %f\n\
     A float value.\n\
\n\
  -d <double>                                          %g\n\
     A double value.\n\
\n\
  -h\n\
     Print the help.\n\n",
      i_val, f_val, d_val);

  if (badparam) {
    fprintf(stderr, "ERROR: \n" );
    fprintf(stderr, "\nBad parameter [%s]\n", badparam);
  }
}

bool getOptions(int argc, const char **argv, int &i_val, float &f_val, double &d_val)
{
  const char *optarg_;
  int   c;
  while ((c = vpParseArgv::parse(argc, argv, GETOPTARGS, &optarg_)) > 1) {

    switch (c) {
    case 'd': d_val = atof(optarg_); break;
    case 'f': f_val = (float) atof(optarg_); break;
    case 'i': i_val = atoi(optarg_); break;
    case 'h': usage(argv[0], NULL, i_val, f_val, d_val); return false; break;

    default:
      usage(argv[0], optarg_, i_val, f_val, d_val); return false; break;
    }
  }

  if ((c == 1) || (c == -1)) {
    // standalone param or error
    usage(argv[0], NULL, i_val, f_val, d_val);
    std::cerr << "ERROR: " << std::endl;
    std::cerr << "  Bad argument " << optarg_ << std::endl << std::endl;
    return false;
  }

  return true;
}

int
main(int argc, const char ** argv)
{
  try {
    using ::std::cout;
    using ::std::endl;

    int    i_val = 3;
    float  f_val = 3.14f;
    double d_val = 3.1415;

    // Read the command line options
    if (getOptions(argc, argv, i_val, f_val, d_val) == false) {
      return (-1);
    }

    cout << "Your parameters: " << endl;
    cout << "  Integer value: " << i_val << endl;
    cout << "  Float   value: " << f_val << endl;
    cout << "  Double  value: " << d_val << endl << endl;
    cout << "Call  " << argv[0]
         << " -h to see how to change these parameters." << endl;

    return 0;
  }
  catch(vpException &e) {
    std::cout << "Catch a ViSP exception: " << e << std::endl;
    return 1;
  }
}