#include <QCryptographicHash>

#include <QSettings>

#include <QDebug>

// generate MD5-Hash

QString test_string("a test string for MD5 hash");

QByteArray md5_hash;

md5_hash = QCryptographicHash::hash(test_string.toUtf8(), QCryptographicHash::Md5);

QString md5hash_string = md5_hash.toHex();

qDebug() << "MD5-Hash:" << md5hash_string;

// write to md5_hash.ini

QSettings md5writeFile(QString("md5_hash.ini"), QSettings::IniFormat);

md5writeFile.setValue(QLatin1String("MD5-Hash"), md5_hash);

md5writeFile.sync();

// read from md5_hash.ini

QSettings md5readFile(QString("md5_hash.ini"), QSettings::IniFormat);

md5readFile.sync();

if (true == md5readFile.contains("MD5-Hash")){

QByteArray md5_array = md5readFile.value("MD5-Hash").toByteArray();

qDebug() << "MD5-Hash read from file:" << md5_array.toHex();

}以上程式碼純手敲並且Qt上驗證透過的，請珍惜使用。