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获取文件MD5码(支持大文件)

第七根弦 2015 年 7 月 21 日 QT 发表评论 (0)

支持大文件md5的获取
废话不说,直接上代码

C++
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#include <QString>
#include <QByteArray>
#include <QCryptographicHash>
#include <QFile>
#include <QDebug>
 
QByteArray getFileMd5(QString filePath)
{
    QFile localFile(filePath);
    if (!localFile.open(QFile::ReadOnly))
    {
        qDebug() << "file open error.";
        return 0;
    }
 
    QCryptographicHash ch(QCryptographicHash::Md5);
 
    quint64 totalBytes = 0;
    quint64 bytesWritten = 0;
    quint64 bytesToWrite = 0;
    quint64 loadSize = 1024 * 4;
    QByteArray buf;
 
    totalBytes = localFile.size();
    bytesToWrite = totalBytes;
 
    while (1)
    {
        if(bytesToWrite > 0)
        {
            buf = localFile.read(qMin(bytesToWrite, loadSize));
            ch.addData(buf);
            bytesWritten += buf.length();
            bytesToWrite -= buf.length();
            buf.resize(0);
        }
        else
        {
            break;
        }
 
        if(bytesWritten == totalBytes)
        {
            break;
        }
    }
 
    localFile.close();
    QByteArray md5 = ch.result();
    return md5;
}

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