Are there functions to make md5 hash

[learning_qt]

Hello,

I hope to hash a file name to 128bit with md5, which function can I use in Qt?

Thanks!

[yogeshgokul]

Use:

QCryptographicHash::hash

QCryptographicHash::hash

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[jpn]

Launch Qt Assistant and write "md5" to the Index-tab, please.

[learning_qt]

Use:

QCryptographicHash::hash

QCryptographicHash::hash

To copy to clipboard, switch view to plain text mode 

Thanks for your reply!
After I use this function, it seems that the hash value is binary. I hope to get text hash value with 256 bit long.
for example,
cab9941d1056e911ff775acdda43086a

How can we get it?

[yogeshgokul]

Use :

QCryptographicHash::hash(str,QCryptographicHash::Md5).toHex().constData();

QCryptographicHash::hash(str,QCryptographicHash::Md5).toHex().constData();

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[learning_qt]

Use :

QCryptographicHash::hash(str,QCryptographicHash::Md5).toHex().constData();

QCryptographicHash::hash(str,QCryptographicHash::Md5).toHex().constData();

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If I just hope to hash a file name like this: /home/ubuntu/pics/pic1.jpg, how can I do it?
Because when I use the function QCryptographicHash::hash(str,QCryptographicHash::M d5).toHex().constData();
It seems that it opens the file and hashes the binary file.

[yogeshgokul]

It seems that it opens the file and hashes the binary file.

Kill me

[learning_qt]

Kill me

This is the result I got with the file name /home/ubuntu/pics/pic1.jpg
Q┤␋┌┌::▒⎽┐I└▒±␊:├␤␊ ␤▒⎽␤ ┴▒┌┤␊ ␋⎽: °2␌00␊␌8␉°°␉653␍16978627␊␊▒30␌82
Q┤␋┌┌::▒⎽┐I└▒±␊:├␤␊ °␋┌␊ ┼▒└␊ ␋⎽: "/␤⎺└␊/┬␊┼⎻␊┼±/233.┘⎻±"
Q┤␋┌┌::▒⎽┐I└▒±␊:├␤␊ °┤┌┌ °␋┌␊ ┼▒└␊ ␋⎽: "°␋┌␊:////␤⎺└␊/┬␊┼⎻␊┼±/233.┘⎻±"
Q┤␋┌┌::▒⎽┐I└▒±␊:├␤␊ ␤▒⎽␤ ┴▒┌┤␊ ␋⎽: "5æF±ð—›Â� �ƒÂ¢YÃ*$␉ð"
Q┤␋┌┌::▒⎽┐I└▒±␊:├␤␊ ␤▒⎽␤ ┴▒┌┤␊ ␋⎽: 35␊646␉1°0979␉81␊2597°␌32▒2462°0

If removed .jpg from the file name, I could get nice result.
cab9941d1056e911ff775acdda43086a

[ChrisW67]

By combining the docs for QCryptographicHash and QString with a splash of QByteArray:

QString fileName("/home/ubuntu/pics/pic1.jpg");
QCryptographicHash hash(QCryptographicHash::Md5);
hash.addData(fileName.toLatin1());
qDebug() << hash.result().toHex();
 
qDebug() << QCryptographicHash::hash(fileName.toLatin1(), QCryptographicHash::Md5).toHex();

QString fileName("/home/ubuntu/pics/pic1.jpg");
QCryptographicHash hash(QCryptographicHash::Md5);
hash.addData(fileName.toLatin1());
qDebug() << hash.result().toHex();

qDebug() << QCryptographicHash::hash(fileName.toLatin1(), QCryptographicHash::Md5).toHex();

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you get

"d615b7ea2e9c46cc84125e638e6e16f0"
"d615b7ea2e9c46cc84125e638e6e16f0"

"d615b7ea2e9c46cc84125e638e6e16f0"
"d615b7ea2e9c46cc84125e638e6e16f0"

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Feel free to verify the correctness.