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I would like to concatenate the two ( /tmp/somedir/anotherdir/file.txt ) with QDir but I am not quite sure what the proper way of doing that is.

According to the documentation for QDir::absoluteFilePath :

"Returns the absolute path name of a file in the directory."

This would be ideal if all I had was a filename, but I have a relative path as well. I looked at some of the other functions on the page, but none of them seemed to be what I was looking for.

What function should I be using?

Small addition if the relative file path starts with a dot:

QString absoluteDirPath = "/tmp/somedir";
QString relativeFilePath = "./anotherdir/file.txt";
QString incorrectPath = QDir{absoluteDirPath}.filePath(relativeFilePath);
qDebug() << "incorrect path:" << incorrectPath;
QString correctPath = QFileInfo{incorrectPath}.absoluteFilePath(); // removes the .
qDebug() << "correct path:" << correctPath;
Output:
incorrect path: "/tmp/somedir/./anotherdir/file.txt"
correct path: "/tmp/somedir/anotherdir/file.txt"
        
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