文件下載問題

Question

我有使用webkit的這個QT腳本。我可以下載文件沒有問題，但我無法在文件對話框中移動進度條。我認爲在我打電話給進度對話框之前已經發送了網絡回覆，因爲點擊下載鏈接有延遲，然後​​被回送到控制檯。如何在完成之前攔截網絡回覆並調用unsupportedContent（）方法？

編輯： 我可以剝離出來，並使用reply = manager.get(QNetworkRequest(url));，但我真的不知道這可能是URL鏈接的任何用戶點擊，沒有預定義的URL？

void MainWindow::unsupportedContent(QNetworkReply *reply) { 

    qDebug() << "Left click - download!"; 
    qDebug() << "Bytes to download: " << reply->bytesAvailable(); 

    QString str = reply->rawHeader("Content-Disposition"); 

    QString end = str.mid(21); 
    end.chop(1); 

    qDebug() << "File name: " << end; 
    qDebug() << "File type: " << reply->rawHeader("Content-Type"); 
    qDebug() << "File size (bytes): " << reply->bytesAvailable(); 
    QString defaultFileName = QFileInfo(end).fileName(); 
    QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"), defaultFileName); 
    if (fileName.isEmpty()) return; 

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

    downloadRequestAborted = false; 

    connect(reply, SIGNAL(finished()), this, SLOT(downloadFinished())); 
     connect(reply, SIGNAL(readyRead()), this, SLOT(downloadReadyRead())); 
     connect(reply, SIGNAL(downloadProgress(qint64,qint64)), this, SLOT(downloadProgress(qint64,qint64))); 
     connect(progressDialog, SIGNAL(canceled()), this, SLOT(cancelDownload())); 
     progressDialog->setLabelText(tr("Downloading %1...").arg(fileName)); 
     //downloadButton->setEnabled(false); 
     progressDialog->exec(); 


    //QFile file(fileName); 
    //file.open(QIODevice::WriteOnly); 
    //file.write(reply->read(reply->bytesAvailable())); 
    //file.close(); 
} 

void MainWindow::downloadProgress(qint64 bytesReceived, qint64 bytesTotal) 
{ 
    qDebug() << bytesReceived << bytesTotal; 
    if(downloadRequestAborted) 
     return; 
    progressDialog->setMaximum(bytesTotal); 
    progressDialog->setValue(bytesReceived); 
} 

void MainWindow::downloadReadyRead() 
{ 
    if(file) 
     file->write(reply->read(reply->bytesAvailable())); 
} 

void MainWindow::downloadFinished() 
{ 
    qDebug() << "Download finished!"; 
    if(downloadRequestAborted) 
    { 
     if(file) 
     { 
      file->close(); 
      file->remove(); 
      delete file; 
      file = NULL; 
     } 
     reply->deleteLater(); 
     progressDialog->hide(); 
     //downloadButton->setEnabled(true); 
     return; 
    } 

    downloadReadyRead(); 
    progressDialog->hide(); 
    //downloadButton->setEnabled(true); 
    file->flush(); 
    file->close(); 

    if(reply->error()) 
    { 
     //Download failed 
     QMessageBox::information(this, "Download failed", tr("Failed: %1").arg(reply->errorString())); 
    } 

    reply->deleteLater(); 
    reply = NULL; 
    delete file; 
    file = NULL; 
} 

void MainWindow::cancelDownload() 
{ 
    downloadRequestAborted = true; 
    reply->abort(); 
    progressDialog->hide(); 
    //downloadButton->setEnabled(true); 
} 

Answer 1

上述方法工作的全部時間，問題是它接收這麼小，你不能告訴它在所有下載的字節數，一旦我嘗試下載較大的文件的字節被下載了充分顯示:)

這裏是我結束了可以收到請求並保存磁盤的方法。

void MainWindow::unsupportedContent(QNetworkReply *reply) { 

    QString str = reply->rawHeader("Content-Disposition"); 

    QString end = str.mid(21); 
    end.chop(1); 

    QString defaultFileName = QFileInfo(end).fileName(); 
    QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"), defaultFileName); 
    if (fileName.isEmpty()) return; 

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

    downloadRequestAborted = false; 
    if(!reply->isFinished()){ 
    connect(reply, SIGNAL(downloadProgress(qint64, qint64)), SLOT(downloadProgress(qint64, qint64))); 

    connect(progressDialog, SIGNAL(canceled()), SLOT(cancelDownload())); 
    progressDialog->setLabelText(tr("Downloading %1...").arg(fileName)); 
    progressDialog->exec(); 
    //return; 
    } 

    if(downloadRequestAborted) 
    { 
     if(file) 
     { 
      file->close(); 
      file->remove(); 
      delete file; 
      file = NULL; 
     } 
     reply->abort(); 
     reply->deleteLater(); 
     progressDialog->hide(); 
     return; 
    } 

    file->write(reply->read(reply->bytesAvailable())); 
    file->flush(); 
    file->close(); 
    file = NULL; 

    if(file == NULL){ 
     isDownload = true; 
     fileURL = fileName; 
    systray->showMessage("CytoViewer v1.0", "Download finished - Click to open", QSystemTrayIcon::NoIcon, 10000); 
    } 
}