Hello,
i have reported last year on the tracker a strange behaviour with this
function : https://bugreports.qt-project.org/browse/QTBUG-23139.
in fact a string empty is also null.
For exemple :
#include <QCoreApplication>
#include <QTextCodec>
#include <QDebug>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QTextCodec *_code =
QTextCodec::codecForName(QString(QLatin1String("Windows-1252")).toLocal8Bit());
QString _t = _code->toUnicode("");
qWarning() << "codec toUnicode" << _t.isEmpty() << _t.isNull();
// return true and true; bad
_t = QString::fromUtf8("");
qWarning() << "fromUtf8" << _t.isEmpty() << _t.isNull();
// return true and false; good
return a.exec();
}
it causes problems with database driver because when a QString is empty
the driver database can put null into the database.
as i say in the bug tracker the problem seems to be in qsimplecodec.cpp
in the function convertToUnicode.
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