Question

如何借助QNetworkRequest创建目录。我知道它没有类似mkDir（）的函数在KFtp中击败，但不知何故它可以通过http请求，或者不同的东西。提前谢谢。

Answer 1

你应该使用QtFtp。它从Qt 5开始不再构建，因此您需要从源代码构建它并将其添加到Qt安装中。我用Qt 5.2在Windows和OSX上完成了它。它还不错。

我只在Qt 4.8下找到了它的在线文档。

http://doc.qt.io/qt-4.8/qftp.html#details

这是您正在寻找的功能。

http://doc.qt.io/qt-4.8/qftp.html#mkdir

Add QFtp in Qt 5.0

https://forum.qt.io/topic/45242/solved-how-to-do-an-ftp-client-with-qt5-what-classes-to-use

实施例

记录示例：

http://doc.qt.io/qt-4.8/qt-network-qftp-example.html

以下是我使用过的需要QtFtp访问的示例。

使用QtFtp的示例：

https://github.com/magist3r/QtWeb/blob/fffaddce36a594013f987e469dbf22d94a78dfa9/src/webview.cpp

webview.h

//////////////////////////////////////////////////// AC: FTP implementation
    QFtp*  m_ftp;
    QFile* m_ftpFile;
    QString m_ftpHtml;

    QProgressDialog         *m_ftpProgressDialog;
    QHash<QString, bool>    m_ftpIsDirectory;
    QString                 m_ftpCurrentPath;

private:
    void ftpCheckDisconnect();
    void ftpDownloadFile(const QUrl &url, QString filename );

private slots:
    void ftpCancelDownload();
    void ftpCommandFinished(int commandId, bool error);
    void ftpAddToList(const QUrlInfo &urlInfo);
    void ftpUpdateDataTransferProgress(qint64 readBytes, qint64 totalBytes);

webview.cpp

///////////////////////////////////////////////////////////////
// AC: FTP impl

void WebView::ftpCancelDownload()
{
    if (m_ftp)
        m_ftp->abort();
}


void WebView::ftpCheckDisconnect()
{
    if (m_ftp)
    {
        m_ftp->abort();
        m_ftp->deleteLater();
        m_ftp = NULL;
        setCursor(Qt::ArrowCursor);
    }
}

void WebView::loadFtpUrl(const QUrl &url)
{
    m_is_loading = true;

    m_ftpHtml.clear();
    setCursor(Qt::WaitCursor);

    m_ftp = new QFtp(this);
    connect(m_ftp, SIGNAL(commandFinished(int, bool)),
            this, SLOT(ftpCommandFinished(int, bool)));
    connect(m_ftp, SIGNAL(listInfo(const QUrlInfo &)),
            this, SLOT(ftpAddToList(const QUrlInfo &)));
    connect(m_ftp, SIGNAL(dataTransferProgress(qint64, qint64)),
            this, SLOT(ftpUpdateDataTransferProgress(qint64, qint64)));

    m_ftpHtml.clear();
    m_ftpCurrentPath.clear();
    m_ftpIsDirectory.clear();

    if (!url.isValid() || url.scheme().toLower() != QLatin1String("ftp")) {
        m_ftp->connectToHost(url.toString(), 21);
        m_ftp->login();
    } else {
        m_ftp->connectToHost(url.host(), url.port(21));

        if (!url.userName().isEmpty())
            m_ftp->login(QUrl::fromPercentEncoding(url.userName().toLatin1()), url.password());
        else
            m_ftp->login();
        if (!url.path().isEmpty())
        {
            if (!url.hasQuery())
            {
                m_ftp->cd(url.path());
            }
            else
            {
                // Downloading file
                QString f =  url.path();
                int ind = f.lastIndexOf('/');
                QString dir = "";
                if (ind != -1 )
                {
                    dir = f.left(ind + 1);
                }

                m_ftp->cd(dir);

                setStatusBarText(tr("Downloading file %1...").arg(url.toString()));
                return;
            }
        }
    }

    setStatusBarText(tr("Connecting to FTP server %1...").arg(url.toString()));
}

void WebView::ftpDownloadFile(const QUrl &url, QString fileName )
{
    if (!m_ftp)
        return;

    if (QFile::exists(fileName)) {
        QMessageBox::information(this, tr("FTP"),
                                 tr("There already exists a file called %1 in "
                                    "the current directory.")
                                 .arg(fileName));
        return;
    }

    QString downloadDirectory = dirDownloads(true);
    if (!downloadDirectory.isEmpty() && downloadDirectory.right(1) != QDir::separator())
        downloadDirectory += QDir::separator();

    QString fn = QFileDialog::getSaveFileName(this, tr("Save File"), downloadDirectory + fileName);
    if (fn.isEmpty()) 
    {
        QMessageBox::information(this, tr("FTP"), tr("Download canceled."));
        return;
    }


    m_ftpFile = new QFile(fn);
    if (!m_ftpFile->open(QIODevice::WriteOnly)) {
        QMessageBox::information(this, tr("FTP"),
                                 tr("Unable to save the file %1: %2.")
                                 .arg(fn).arg(m_ftpFile->errorString()));
        delete m_ftpFile;
        return;
    }

    m_ftp->get(fileName, m_ftpFile);

    m_ftpProgressDialog->setLabelText(QString("&nbsp;<br>" + tr("Downloading <b>%1</b>")).arg(fn));
    m_ftpProgressDialog->setWindowTitle(tr("FTP Download"));
    m_ftpProgressDialog->setModal(true);
}


void WebView::ftpCommandFinished(int res, bool error)
{
    setCursor(Qt::ArrowCursor);

    if (!m_ftp)
        return;

    if (m_ftp->currentCommand() == QFtp::ConnectToHost) {
        if (error) {
            QMessageBox::information(this, tr("FTP"),
                                     tr("Unable to connect to the FTP server at %1. Please check that the host name is correct.")
                                     .arg(m_initialUrl.toString()));
            ftpCheckDisconnect();
            return;
        }

        setStatusBarText(tr("Logged onto %1.").arg(m_initialUrl.host()));
        return;
    }

    if (m_ftp->currentCommand() == QFtp::Login)
    {
        setStatusBarText(tr("Listing %1...").arg(m_initialUrl.toString()));
        m_ftpHtml.clear();
        QString u = m_initialUrl.toString();
        int ind = u.lastIndexOf('/');
        if (ind != -1 && ind > 7 && ind < u.length() -1 )
        {
            u = u.left(ind);
        }
        else
            u = "";

        if ( !m_initialUrl.hasQuery() )
        {
            //<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\">
            m_ftpHtml = "<html><body><PRE><H2>Contents of " + m_initialUrl.toString() + "</H2>" + 
                (u.length() > 0 ? "<p> Go to <a href=\"" + u + "\">parent directory</a>" : QString(""))+
                "<p><table cellpadding=3 cellspacing=3><tr><td></td><td><b>Name</b></td><td width=70 align=right><b>Size</b></td><td width=110 align=center><b>Date/Time</b></td></tr><tr><td>&nbsp;</td><td></td></tr>";
            setCursor(Qt::WaitCursor);
            m_ftp->list();
        }
        else
        {
            QString f =  m_initialUrl.toString().left(m_initialUrl.toString().length() - 4);
            int ind = f.lastIndexOf('/');
            if (ind != -1 )
            {
                f = f.right(f.length() - ind - 1);
            }
            ftpDownloadFile(m_initialUrl, f );
        }
    }

    if (m_ftp->currentCommand() == QFtp::Get) 
    {
        if (error) 
        {
            setStatusBarText(tr("Canceled download of %1").arg(m_ftpFile->fileName()));
            m_ftpFile->close();
            m_ftpFile->remove();
        } 
        else 
        {
            DownloadManager* dm = BrowserApplication::downloadManager();
            setStatusBarText(tr("Successfully downloaded file %1").arg(m_ftpFile->fileName()));
            m_ftpFile->close();

            dm->addItem(m_initialUrl, m_ftpFile->fileName(), true );
        }
        delete m_ftpFile;
        m_ftpProgressDialog->hide();
    } 
    else 
    if (m_ftp->currentCommand() == QFtp::List) 
    {
        setStatusBarText(tr("Listed %1").arg(m_initialUrl.toString()));
        if (m_ftpIsDirectory.isEmpty()) 
        {
            m_ftpHtml += "<tr><td>Directory is empty</td></tr>";
        }
        m_ftpHtml += "</table></PRE></body></html>";
        setHtml(m_ftpHtml, m_initialUrl);
        //page()->mainFrame()->setHtml(m_ftpHtml, m_initialUrl);
        //QString html = page()->mainFrame()->toHtml () ;
        //page()->setViewportSize(size()); 
        m_is_loading = false;

    }

    urlChanged(m_initialUrl);
}


void WebView::ftpAddToList(const QUrlInfo &urlInfo)
{
    m_ftpHtml += "<tr><td>" + (urlInfo.isDir() ? QString("DIR") : QString("")) +  "</td>"; 
    m_ftpHtml += "<td>" + (urlInfo.isDir() ? QString("<b>") : QString("")) + 
        (urlInfo.isDir() ? QString("<a href=\"" + m_initialUrl.toString() + (m_initialUrl.toString().right(1) == "/" ? QString(""): QString("/"))
        + urlInfo.name() + "\">") : QString("")) + 
        urlInfo.name() + (urlInfo.isDir() ? QString("</a>") : QString("")) + "</td>";
    m_ftpHtml += "<td align=right>" + (urlInfo.isDir() ? "" : QString::number(urlInfo.size())) + "</td>";
    m_ftpHtml += "<td align=center>" + urlInfo.lastModified().toString("MMM dd yyyy") + "</td>";
    m_ftpHtml += "<td>" + 
        (!urlInfo.isDir() ? QString("<a href=\"" + m_initialUrl.toString() + (m_initialUrl.toString().right(1) == "/" ? QString(""): QString("/"))
        + urlInfo.name() + "?get\">") : QString("")) + 
        (!urlInfo.isDir() ? QString("GET FILE</a>") : QString("")) + "</td></tr>";

    m_ftpIsDirectory[urlInfo.name()] = urlInfo.isDir();

}

void WebView::ftpUpdateDataTransferProgress(qint64 readBytes,
                                           qint64 totalBytes)
{
    if (m_ftpProgressDialog)
    {
        m_ftpProgressDialog->setMaximum(totalBytes);
        m_ftpProgressDialog->setValue(readBytes);
    }
}

希望有所帮助。

Answer 2

嗯，简而言之，我决定在GitHub QtFtp上找到的问题编译并扔到正确的地方，并且它有效。这里是对存档的圈套（仅在草案qftp中移除子项目'示例'且不会编译）。https://codeload.github.com/qtproject/qtftp/zip/master

如何在Qt 5.5中在FTP服务器上创建目录

2 个答案:

实施例