[solved] QLocale - with atof - why doesn't it convert "3.3"?

[agold2012]

Hi, I've been having a problem for quite some while now with the Qt locale.
I'm using Qt 4.6.2 on Ubuntu 10.04 64. In my code I'm using a library that uses the function
atof (from stdlib.h), normally this would return for example:
atof("4.4") = 4.4; but in my case it works only with atof("4,4")=4.4
Since my System is set to ES locale, I understand that it uses commas, but when I try to set the locale to US-EN, it still doesn't work:

@
#include <QtCore/QCoreApplication>
#include <QLocale>

#include <iostream>
#include <cmath>
#include <cstdlib>

using namespace std;

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

QLocale::setDefault(QLocale(QLocale::English, QLocale::UnitedStates));

cout << "arg[1]   : " << argv[1] << endl;
cout << "atof(arg): " << atof(argv[1])<<endl;

return 0;
}
@

This gives:
@$ ./mtest 3.3
arg[1] : 3.3
atof(arg): 3

$ ./mtest 3,3
arg[1] : 3,3
atof(arg): 3.3
@

Anyone knows how I can change the locale such that I don't have to change the library's code?

Thanks in advance!

[goetz]

atof doesn't care about [[Doc:QLocale]] settings and QLocale doesn't change the posix locale of the process. You need to set the environment variable LANG (or LC_NUMERIC).

[agold2012]

Thanks! It worked using setlocale(..)!

@
#include <QtCore/QCoreApplication>
//#include <QLocale>
#include <locale.h>

#include <iostream>
#include <cmath>
#include <cstdlib>

using namespace std;

int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);

// QLocale::setDefault(QLocale(QLocale::English, QLocale::UnitedStates));
setlocale(LC_NUMERIC,"en_US");

cout << "arg[1] : " << argv[1] << endl;
cout << "atof(arg): " << atof(argv[1])<<endl;
return 0;
}
@