计算文件或一段内容的md5值

// 计算text内容MD5
QByteArray gAppTextChecksum(const QString& text) {
    QCryptographicHash crypto(QCryptographicHash::Md5);
    crypto.addData(text.toLocal8Bit());
    return crypto.result().toHex();
}

// 计算文件MD5
QByteArray gAppFileChecksum(const QString& filePath) {
    QCryptographicHash crypto(QCryptographicHash::Md5);
    QFile file(filePath);
    file.open(QFile::ReadOnly);
    while(!file.atEnd()){
        crypto.addData(file.read(8192));
    }
    file.close();

    return crypto.result().toHex();
}