Command line parser for Qt4

Question

I am looking for a command line parser for Qt4.

I did a small google search, and found this: http://www.froglogic.com/pg?id=PublicationsFreeware&category=getopt how

Answer 1

A really simple method is to scan "key=value" args,
put them in a table say zz.map: QString -> QVariant,
and get their values with zz.map.value( key, default ). An example:

#include "ztest.h"
Ztest zz;  
int main( int argc, char* argv[] )
{
    zz.eqargs( ++ argv );  // scan  test=2 x=str ... to zz.map

    QString xx = zz.map.value( "xx", "" );
    if( Zint( Size, 10 ))  // a #def -> zz.map.value( "Size", 10 )
        ...

ztest.h is < 1 page, below; same for Python ~ 10 lines.

(Everybody has his/her favorite options parser; this one's about the simplest.
Worth repeating: however you specify options, echo them to output files --
"every scientist I know has trouble keeping track of what parameters they used last time they ran a script".)

To make QPoints etc work one of course needs a QString -> QPoint parser. Anyone know offhand why this doesn't work (in Qt 4.4.3) ?

QPoint pt(0,0);
QDataStream s( "QPoint(1,2)" );
s >> pt;
qDebug() << "pt:" << pt;  // QPoint(1364225897,1853106225) ??

Added 25nov --

// ztest.h: scan args x=2 s=str ... to a key -> string table
// usage:
// Ztest ztest;
// int main( int argc, char* argv[] )
// {
//     QApplication app( argc, argv );
//     ztest.eqargs( ++ argv );  // scan leading args name=value ...
//     int x = Zint( x, 10 );  // arg x= or default 10
//     qreal ff = Zreal( ff, 3.14 );
//     QString s = Zstr( s, "default" );
// care: int misspelled = Zint( misspellled ) -- you lose
//version: 2009-06-09 jun denis

#ifndef ztest_h
#define ztest_h

#include 
#include 
#include 
#include 

//------------------------------------------------------------------------------
class Ztest {
public:
  QHash< QString, QVariant > map;
  int test;  // arg test=num,  if( ztest.test )

  Ztest() : test( 0 ) {}

  QVariant val( const QString& key, const QVariant& default_ = 0 )
  {
    return map.value( key, default_ );
  }

  void setval( const QString& key, const QVariant& val )
  {
    map[key] = val;
    if( key == "test"  ||  key == "Test" )
        test = val.toInt();
  }

//------------------------------------------------------------------------------
    // ztest.eqargs( ++ argv )  scans test=2 x=3 ... -> ztest table
  void eqargs( char** argv )
  {
    char** argv0 = argv;
    char *arg;
    QRegExp re( "(\\w+)=(.*)" );  // name= anything, but not ./file=name
    for( ; (arg = *argv) && re.exactMatch( arg );  argv ++ ){
        setval( re.cap(1), re.cap(2) );
    }
        // change argv[0..] -> args after all name=values
    while(( *argv0++ = *argv++) != 0 ) {}
  }
};

extern Ztest ztest;

    // macros: int x = Zint( x, 10 ): x= arg or default 10
#define Zstr( key, default )    ztest.val( #key, default ).toString()
#define Zint( key, default )    ztest.val( #key, default ).toInt()
#define Zreal( key, default )   ztest.val( #key, default ).toDouble()

#endif