qt 获取字符串的md5加密值

#include "mainwindow.h"
#include <QApplication>
#include <QDebug>
#include <QString>
#include <QCryptographicHash>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    QString pwd="alibaba";
    QString md5;
    QByteArray ba,bb;
    QCryptographicHash md(QCryptographicHash::Md5);
    ba.append(pwd);
    md.addData(ba);
    bb=md.result();
    md5.append(bb.toHex());
    qDebug()<<md5;
    return a.exec();
}