qHash in Qt5

[htettey]

I have just migrated a project from qt4.8.5 to qt5.4.1, and it appears that the resulting value of a call to qHash() in qt4.8.5 to qt5.4.1 return different results. For example:

qHash ( "Hello" ) in qt4.8.5 returns a different result to the same function call in qt5.4.1.

Can someone please advise on this?

Thanks

[sneubert]

Hi htettey,

QHash is a template class for storing key, value pairs. The hash returned by qHash() is used for fast lookup and can change in every version of Qt. It´s not intended to be used as a hash to store a password for example.
If you want to have a hash of e.g. a QStringuse the QCryptographicHash class. You can choose the hash function to use.

QCryptographicHash hashObject(QCryptographicHash::Sha256);

hasObject.addData(QByteArray(QString("Hello").toStdString().c_str()));

QByteArray hashResult(hashObject.result());

[htettey]

@sneubert

Hi sneubert,

thanks very much for your reply. I was using it is store passwords which has now caused problems for me. I will do as you have recommended.

Thank you.