ftp upload fails

[janbur]

On Qt 5.7.0 win10 UWP winrt x86 version I get the messages below when trying to upload a file on my ftp server:

qt.winrtrunner.app: Could not obtain NoDelay information from socket control
qt.winrtrunner.app: Uploaded 126 of 126

The result is the creation of an empty file with 0 bytes, the finished slot never fires.
It helps when I copy
data->deleteLater();
reply->deleteLater();
to the uploadProgress slot, 1 in 2 attempts succeed then with the creation of a 126 bytes file.

But this is not good enough of course, anyone any idea why the finished Signal never fires ?

class Uploader: public QObject
{
    Q_OBJECT
public:
    Uploader(QObject *p = 0): QObject(p)     {  }

    void start(const QString &file)     {
        QUrl url("ftp://ftp.xxxxxx.com/test.txt");
        url.setUserName("ftp_xxxx@yyyyy.com");
        url.setPassword("xxxxxx");
        url.setPort(21);

        data = new QFile(file, this);
        if (data->open(QIODevice::ReadOnly)) {
            reply = nam.put(QNetworkRequest(url), data);
            connect(reply, SIGNAL(uploadProgress(qint64, qint64)), SLOT(uploadProgress(qint64, qint64)));
            connect(reply, SIGNAL(finished()), SLOT(uploadDone()));
        }
        else
            qDebug() << "Oops";
    }

public slots:
    void uploadProgress(qint64 bytesSent, qint64 bytesTotal)    {
        qDebug() << "Uploaded" << bytesSent << "of" << bytesTotal;
    }

    void uploadDone()     {
        qDebug() << "Finished" << reply->error();
        data->deleteLater();
        reply->deleteLater();
    }

private:
    QNetworkAccessManager nam;
    QFile *data;
    QNetworkReply *reply;
};

[VRonin]

2 things:

• can you show us the snippet where you call start?
• can you connect QNetworkReply::error signal to a slot to debug what is happening?

one minor thing is make the two slots private as calling uploadDone() before calling start will operate on a dangling data pointer

[janbur]

I'm using the widgets/mainwindows/application example.

I've tried the Error signal + slot, but it didn't execute (like the finished slot).

In mainwindow.h I added the uploader object and in class MainWindow:

private:
    QString filenameup;
    QFile fileup;
    Uploader u3;

In mainwindow.cpp I added in bool MainWindow::save() :
(pressing the Save button of the app's menu starts the upload)

    str1 = str1.left(126);

    QByteArray qbarr;
    qbarr.clear();
    qbarr.append(str1);

    QString path = QStandardPaths::standardLocations(QStandardPaths::AppDataLocation).value(0);
    filenameup = path + "\\test.txt";
    fileup.close();
    fileup.setFileName(filenameup);
    fileup.open(QIODevice::ReadWrite);
    fileup.write(qbarr);
    fileup.close();

    u3.start(filenameup);

    QTime t; 
    t.start();
    while(t.elapsed() < 3000) {
       QCoreApplication::processEvents(QEventLoop::AllEvents, 3000-t.elapsed());
    }

    fileup.close();

    return 0;
}

[janbur]

Today I compiled this piece of coding with Qt 5.3 for Windows on a Windows 10 machine.
And it runs like a charm, it executes the Finished slot and does the ftp upload.

So it looks like it has sth to do with Qt 5.7 and winrt/uwp

Note: Qt 5.3 doesn't know QStandardPaths::standardLocations(QStandardPaths::AppDataLocation).value(0);
changed this to:
filenameup = "test.txt";