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#include <QSettings>
#include <QDebug>
#include <QStringList>
#include <QTextCodec>
#include <QObject>

int main(int argc, char **argv)
{


    QTextCodec *codec = QTextCodec::codecForName("UTF-8");
    QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("UTF-8"));
    QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));

    QSettings set(app.applicationDirPath()+"/programs/cats.ini",QSettings::IniFormat);
    set.setIniCodec(codec);
    QString key = "секция/ключ";
    QVariant value = "валуе";

    set.setValue(key,value);

}

QString key = QString::fromUtf8("секция/ключ");

#include <QtGui/QApplication>
#include <QTextCodec>
#include <QSettings>
#include <QDebug>

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

 QTextCodec *codec = QTextCodec::codecForName("Windows-1251");

 QSettings ini(qApp->applicationDirPath()+"/programs/cats.ini",QSettings::IniFormat);
 ini.setIniCodec( codec );


 ini.beginGroup(codec->toUnicode("группа"));
 ini.setValue(codec->toUnicode("ключ"),codec->toUnicode("валуя"));
 ini.endGroup();

 return 0;
}

void QSettings::setIniCodec ( const char * codecName )

        QtJsonSettings::setIniCodec( "UTF-8" );
	QString section_test = tr( "SECTION/TEST" );
	
	QString section_1 = section_test + tr( "/NUMBER_1" );
	QString section_2 = section_test + tr( "/NUMBER_2" );
	
	QString value_rus = tr( "Значение" );
	QString value_en = tr( "Value" );
	
	QtJsonSettings::setValue( section_1, value_en );
	QtJsonSettings::setValue( section_2, value_rus );
	
	QtJsonSettings::sync();

        QTextCodec* codec = QTextCodec::codecForName( "UTF-8" );
	
	if ( codec != 0 )
	{
		QTextCodec::setCodecForCStrings( codec );
		QTextCodec::setCodecForLocale( codec );
		QTextCodec::setCodecForTr( codec );
	}