vpParseArgv Class Reference

#include <visp3/io/vpParseArgv.h>

Public Types
enum	vpArgvType {   ARGV_CONSTANT , ARGV_CONSTANT_INT , ARGV_CONSTANT_BOOL , ARGV_INT ,   ARGV_LONG , ARGV_STRING , ARGV_REST , ARGV_FLOAT ,   ARGV_DOUBLE , ARGV_FUNC , ARGV_GENFUNC , ARGV_HELP ,   ARGV_END }
enum	vpArgvFlags {   ARGV_NO_DEFAULTS = 0x1 , ARGV_NO_LEFTOVERS = 0x2 , ARGV_NO_ABBREV = 0x4 , ARGV_DONT_SKIP_FIRST_ARG = 0x8 ,   ARGV_NO_PRINT = 0x10 }

Static Public Member Functions
static bool	parse (int *argcPtr, const char **argv, vpArgvInfo *argTable, int flags)
static int	parse (int argc, const char **argv, const char *validOpts, const char **param)

Static Public Attributes
static vpArgvInfo	defaultTable [2]

Detailed Description

Command line argument parsing.

The code below shows a first way to parse command line arguments using vpParseArgv class. It allows to specify an option name with more than one character.

#include <stdio.h>
#include <visp3/core/vpMath.h>
#include <visp3/io/vpParseArgv.h>
 
// Usage : [-bool] [-int <integer value>] [-long <long value>]
//         [-float <float value>] [-double <double value>] [-string <string value>] [-h]
int main(int argc, const char ** argv)
{
  // Variables to set by command line parsing
  bool   b_val = false;
  int    i_val = 10;
  long   l_val = 123456;
  float  f_val = 0.1f;
  double d_val = M_PI;
  char   *s_val;
 
  // Parse the command line to set the variables
  vpParseArgv::vpArgvInfo argTable[] =
  {
    {"-bool", vpParseArgv::ARGV_CONSTANT_BOOL, 0, (char *) &b_val,
    "Flag enabled."},
    {"-int", vpParseArgv::ARGV_INT, (char*) nullptr, (char *) &i_val,
    "An integer value."},
    {"-long", vpParseArgv::ARGV_LONG, (char*) nullptr, (char *) &l_val,
    "An integer value."},
    {"-float", vpParseArgv::ARGV_FLOAT, (char*) nullptr, (char *) &f_val,
    "A float value."},
    {"-double", vpParseArgv::ARGV_DOUBLE, (char*) nullptr, (char *) &d_val,
    "A double value."},
    {"-string", vpParseArgv::ARGV_STRING, (char*) nullptr, (char *) &s_val,
    "A string value."},
    {"-h", vpParseArgv::ARGV_HELP, (char*) nullptr, (char *) nullptr,
    "Print the help."},
    {(char*) nullptr, vpParseArgv::ARGV_END, (char*) nullptr, (char*) nullptr, (char*) nullptr} } ;
 
  // Read the command line options
  if(vpParseArgv::parse(&argc, argv, argTable,
                        vpParseArgv::ARGV_NO_LEFTOVERS |
                        vpParseArgv::ARGV_NO_ABBREV |
                        vpParseArgv::ARGV_NO_DEFAULTS)) {
    return (false);
  }
 
  // b_val, i_val, l_val, f_val, d_val, s_val may have new values
}

The code below shows an other way to parse command line arguments using vpParseArgv class. Here command line options are only one character long.

#include <stdio.h>
#include <stdlib.h>
#include <visp3/core/vpMath.h>
#include <visp3/io/vpParseArgv.h>
 
// List of allowed command line options
#define GETOPTARGS "bi:l:f:d:h" // double point mean here that the preceding option request an argument
 
// Usage : [-b] [-i <integer value>] [-l <long value>]
//         [-f <float value>] [-d <double value>] [-s <string value>] [-h]
int main(int argc, const char ** argv)
{
  // Variables to set by command line parsing
  bool   b_val = false;
  int    i_val = 10;
  long   l_val = 123456;
  float  f_val = 0.1f;
  double d_val = M_PI;
  std::string s_val;
 
  // Parse the command line to set the variables
  const char *optarg;
  int c;
  while ((c = vpParseArgv::parse(argc, argv, GETOPTARGS, &optarg)) > 1) {
 
    switch (c) {
    case 'b': b_val = true; break;
    case 'i': i_val = atoi(optarg); break;
    case 'l': l_val = atol(optarg); break;
    case 'f': f_val = static_cast<float>(atof(optarg)); break;
    case 'd': d_val = atof(optarg); break;
    case 's': s_val = std::string(optarg); break;
    case 'h': printf("Usage: ...\n"); return EXIT_SUCCESS; break;
 
    default:
      printf("Usage: ...\n"); return EXIT_SUCCESS; break;
    }
  }
  if ((c == 1) || (c == -1)) {
    // standalone param or error
    printf("Usage: ...\n");
    return EXIT_FAILURE;
  }
 
  // b_val, i_val, l_val, f_val, d_val, s_val may have new values
}

Definition at line 144 of file vpParseArgv.h.

Member Enumeration Documentation

vpArgvFlags

enum vpParseArgv::vpArgvFlags

Flag bits.

Enumerator
ARGV_NO_DEFAULTS	No default options like -help.
ARGV_NO_LEFTOVERS	Print an error message if an option is not in the argument list.
ARGV_NO_ABBREV	No abrevation. Print an error message if an option is abrevated (ie "-i" in place of "-int" which is requested).
ARGV_DONT_SKIP_FIRST_ARG	Don't skip first argument.
ARGV_NO_PRINT	No printings.

Definition at line 170 of file vpParseArgv.h.

vpArgvType

enum vpParseArgv::vpArgvType

Legal values for the type field of a vpArgvInfo.

Enumerator
ARGV_CONSTANT	Stand alone argument. Same as vpParseArgv::ARGV_CONSTANT_INT.
ARGV_CONSTANT_INT	Stand alone argument associated to an int var that is set to 1.
ARGV_CONSTANT_BOOL	Stand alone argument associated to a bool var that is set to true.
ARGV_INT	Argument is associated to an int.
ARGV_LONG	Argument is associated to a long.
ARGV_STRING	Argument is associated to a char * string.
ARGV_REST
ARGV_FLOAT	Argument is associated to a float.
ARGV_DOUBLE	Argument is associated to a double.
ARGV_FUNC
ARGV_GENFUNC
ARGV_HELP	Argument is for help displaying.
ARGV_END	End of the argument list.

Definition at line 150 of file vpParseArgv.h.

Member Function Documentation

parse() [1/2]

bool vpParseArgv::parse ( int *  argcPtr, const char **  argv, vpArgvInfo *  argTable, int  flags  )

static

Process an argv array according to a table of expectedvcommand-line options.

The return value is a boolean value with true indicating an error. If an error occurs then an error message is printed on stderr. Under normal conditions, both *argcPtr and *argv are modified to return the arguments that couldn't be processed here (they didn't match the option table, or followed an vpParseArgv::ARGV_REST argument).

Parameters

argcPtr	Pointer to the count of command line arguments.
argv	Array of command line argument strings.
argTable	Array of command-specific argument descriptions.
flags	This parameter is to set with vpParseArgv::vpArgvFlags values or combinations of these values using the OR operator (vpParseArgv::ARGV_NO_LEFTOVERS | vpParseArgv::ARGV_NO_DEFAULTS). If the vpParseArgv::ARGV_NO_DEFAULTS bit is set, then don't generate information for default options.

Examples

AROgre.cpp, AROgreBasic.cpp, BSpline.cpp, SickLDMRS-Process.cpp, displayD3D.cpp, displayGTK.cpp, displayOpenCV.cpp, displaySequence.cpp, grab1394CMU.cpp, grab1394Two.cpp, grabDirectShow.cpp, grabDirectShowMulti.cpp, grabDisk.cpp, grabFlyCapture.cpp, grabV4l2.cpp, grabV4l2MultiCpp11Thread.cpp, histogram.cpp, homographyHLM2DObject.cpp, homographyHLM3DObject.cpp, homographyHartleyDLT2DObject.cpp, homographyRansac2DObject.cpp, imageDiskRW.cpp, imageSequenceReader.cpp, mbtEdgeKltTracking.cpp, mbtEdgeTracking.cpp, mbtGenericTracking.cpp, mbtGenericTracking2.cpp, mbtGenericTrackingDepth.cpp, mbtGenericTrackingDepthOnly.cpp, mbtKltTracking.cpp, moveAfma4.cpp, moveBiclops.cpp, parallelPort.cpp, parse-argv1.cpp, parse-argv2.cpp, photometricMappingVisualServoing.cpp, photometricVisualServoing.cpp, photometricVisualServoingWithoutVpServo.cpp, poseVirtualVS.cpp, readRealSenseData.cpp, ringLight.cpp, saveRealSenseData.cpp, servoAfma4Point2DCamVelocityKalman.cpp, servoBiclopsPoint2DArtVelocity.cpp, servoSimu3D_cMcd_CamVelocity.cpp, servoSimu3D_cMcd_CamVelocityWithoutVpServo.cpp, servoSimu3D_cdMc_CamVelocity.cpp, servoSimu3D_cdMc_CamVelocityWithoutVpServo.cpp, servoSimu4Points.cpp, servoSimuAfma6FourPoints2DCamVelocity.cpp, servoSimuCircle2DCamVelocity.cpp, servoSimuCircle2DCamVelocityDisplay.cpp, servoSimuCylinder.cpp, servoSimuCylinder2DCamVelocityDisplay.cpp, servoSimuCylinder2DCamVelocityDisplaySecondaryTask.cpp, servoSimuFourPoints2DCamVelocity.cpp, servoSimuFourPoints2DCamVelocityDisplay.cpp, servoSimuFourPoints2DPolarCamVelocityDisplay.cpp, servoSimuLine2DCamVelocityDisplay.cpp, servoSimuPoint2DCamVelocity1.cpp, servoSimuPoint2DCamVelocity2.cpp, servoSimuPoint2DCamVelocity3.cpp, servoSimuPoint2DhalfCamVelocity1.cpp, servoSimuPoint2DhalfCamVelocity2.cpp, servoSimuPoint2DhalfCamVelocity3.cpp, servoSimuPoint3DCamVelocity.cpp, servoSimuSphere.cpp, servoSimuSphere2DCamVelocity.cpp, servoSimuSphere2DCamVelocityDisplay.cpp, servoSimuSphere2DCamVelocityDisplaySecondaryTask.cpp, servoSimuSquareLine2DCamVelocityDisplay.cpp, servoSimuThetaUCamVelocity.cpp, servoSimuViper850FourPoints2DCamVelocity.cpp, simulateCircle2DCamVelocity.cpp, simulateFourPoints2DCartesianCamVelocity.cpp, simulateFourPoints2DPolarCamVelocity.cpp, templateTracker.cpp, testAutoThreshold.cpp, testClick.cpp, testConnectedComponents.cpp, testContours.cpp, testConversion.cpp, testCrop.cpp, testCropAdvanced.cpp, testDisplayPolygonLines.cpp, testDisplayRoi.cpp, testDisplays.cpp, testFeatureSegment.cpp, testFloodFill.cpp, testGenericTracker.cpp, testGenericTrackerDepth.cpp, testHistogram.cpp, testImageComparison.cpp, testImageFilter.cpp, testImageNormalizedCorrelation.cpp, testImageTemplateMatching.cpp, testImgproc.cpp, testIoPGM.cpp, testIoPPM.cpp, testKeyPoint-2.cpp, testKeyPoint-3.cpp, testKeyPoint-4.cpp, testKeyPoint-5.cpp, testKeyPoint-6.cpp, testKeyPoint-7.cpp, testKeyPoint.cpp, testMatrixDeterminant.cpp, testMatrixInverse.cpp, testMatrixPseudoInverse.cpp, testMouseEvent.cpp, testNurbs.cpp, testPerformanceLUT.cpp, testPolygon.cpp, testReadImage.cpp, testRobust.cpp, testSvd.cpp, testTrackDot.cpp, testUndistortImage.cpp, testVideoDevice.cpp, testVideoDeviceDual.cpp, testXmlParser.cpp, trackDot.cpp, trackDot2WithAutoDetection.cpp, trackMeCircle.cpp, trackMeEllipse.cpp, trackMeLine.cpp, trackMeNurbs.cpp, tutorial-panda3d-renderer.cpp, videoReader.cpp, and wireframeSimulator.cpp.

Definition at line 70 of file vpParseArgv.cpp.

References ARGV_CONSTANT, ARGV_CONSTANT_BOOL, ARGV_CONSTANT_INT, ARGV_DONT_SKIP_FIRST_ARG, ARGV_DOUBLE, ARGV_END, ARGV_FLOAT, ARGV_FUNC, ARGV_GENFUNC, ARGV_HELP, ARGV_INT, ARGV_LONG, ARGV_NO_ABBREV, ARGV_NO_LEFTOVERS, ARGV_REST, ARGV_STRING, and defaultTable.

parse() [2/2]

int vpParseArgv::parse ( int  argc, const char **  argv, const char *  validOpts, const char **  param  )

static

Get next command line option and parameter.

Parameters

argc	Count of command line arguments.
argv	Array of command line argument strings.
validOpts	String of valid case-sensitive option characters, a ':' following a given character means that option can take a parameter.
param	Pointer to a pointer to a string for output.

Returns

If valid option is found, the character value of that option is returned, and *param points to the parameter if given, or is nullptr if no param.

If standalone parameter (with no option) is found, 1 is returned, and *param points to the standalone parameter

If option is found, but it is not in the list of valid options, -1 is returned, and *param points to the invalid argument.

When end of argument list is reached, 0 is returned, and *param is nullptr.

Definition at line 511 of file vpParseArgv.cpp.

Member Data Documentation

defaultTable

BEGIN_VISP_NAMESPACE vpParseArgv::vpArgvInfo vpParseArgv::defaultTable

static

Initial value:

= {
      {"-help", ARGV_HELP, (char *)nullptr, (char *)nullptr, "Print summary of command-line options and abort.\n"},
      {nullptr, ARGV_END, (char *)nullptr, (char *)nullptr, (char *)nullptr} }

Definition at line 196 of file vpParseArgv.h.

Referenced by parse().