Upload file with progress

AliReza Beytari

Hey guys!
As title says, How to upload a file with progress?!
I have seen this links:
https://forum.qt.io/topic/11086/solved-qnetworkaccessmanager-uploading-files
http://www.qtcentre.org/threads/17564-file-upload-using-QNetworkRequest-amp-QNetworkAccessManager

But I couldn't understand somethings. For example, what is the "boundary"?!
This the html form that I want to post:

<form action="upload.php" method="post" id="upload_form" enctype="multipart/form-data">
    <input name="userfile[]" type="file" size="50">
    <br>
    <input name="userfile[]" type="file" size="50">
    <br>
    <input name="userfile[]" type="file" size="50">
    <br>
    <input name="userfile[]" type="file" size="50">
    <br>
    <input name="userfile[]" type="file" size="50">
    <br>
    <span id="more_file_inputs"></span>
    <br>
    <div>
        <center>
            <div id="upload_options">
                Upload type:
                <input type="radio" name="private_upload" value="0" checked="checked"> Public
                <input type="radio" name="private_upload" value="1"> Private
            </div>
        </center>
    </div>
    <br>
    <input class="button1" type="submit" value="Upload" />
</form>

As you can see, we have to send some other inputs too; like "private_upload" beside "userfile" input.

Please help to do that.
Thanks.

SGaist

Hi,

Something is not clear. Are you trying to upload a file through C++ or are you trying to mix C++ and HTML ?

raven-worx

in case you want to do the same like the browser with a HTML-form would do take a look at QHttpMultiPart class (it takes care of the request boundary and you can compose your custom parts together and send them via QNAM):

QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);

QHttpPart textPart;
textPart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"text\""));
textPart.setBody("my text");

QHttpPart imagePart;
imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/jpeg"));
imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"image\""));
QFile *file = new QFile("image.jpg");
file->open(QIODevice::ReadOnly);
imagePart.setBodyDevice(file);
file->setParent(multiPart); // we cannot delete the file now, so delete it with the multiPart

multiPart->append(textPart);
multiPart->append(imagePart);

QUrl url("http://my.server.tld");
QNetworkRequest request(url);

QNetworkAccessManager manager;
QNetworkReply *reply = manager.post(request, multiPart);
multiPart->setParent(reply); // delete the multiPart with the reply
// here connect signals etc.

Then use QnetworkAccessManager::post() to send the request and connect to the returned QNetworkReply's uploadProgress() signal.

AliReza Beytari

@SGaist Upload a file through Qt.

AliReza Beytari

@raven-worx I use your code like this:

mainwindow.cpp:

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
    textPart.setHeader(QNetworkRequest::ContentDispositionHeader,
                       QVariant("form-data; name=\"private_upload\""));
    textPart.setBody("0");

    imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/png"));
    imagePart.setHeader(QNetworkRequest::ContentDispositionHeader,
                        QVariant("form-data; name=\"userfile\""));

    file = new QFile("test.png");
    file->open(QIODevice::ReadOnly);
    imagePart.setBodyDevice(file);
    file->setParent(multiPart);

    multiPart->append(textPart);
    multiPart->append(imagePart);

    url = QUrl("http://8pic.ir/upload.php");
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_btnUploadFile_clicked()
{
    QNetworkRequest request(url);
    QNetworkAccessManager manager;
    QNetworkReply *reply = manager.post(request, multiPart);
    multiPart->setParent(reply);
    delete multiPart;
    connect(&manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(onReqFinished(QNetworkReply*)));
}

void MainWindow::onReqFinished(QNetworkReply *reply)
{
    QMessageBox::information(this, "Response", reply->readAll());
}

mainwindow.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

#include <QUrl>
#include <QFile>
#include <QHttpPart>
#include <QMessageBox>
#include <QNetworkReply>
#include <QHttpMultiPart>
#include <QNetworkRequest>
#include <QNetworkAccessManager>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_btnUploadFile_clicked();
    void onReqFinished(QNetworkReply *reply);

private:
    Ui::MainWindow *ui;
    QHttpMultiPart *multiPart;
    QHttpPart textPart;
    QHttpPart imagePart;
    QFile *file;
    QUrl url;
};

#endif // MAINWINDOW_H

But unfortunately, it didn't work!!
I couldn't get any response!!

SGaist

In on_btnUploadFile_clicked you are creating a local QNetworkAccessManager, it will be destroyed at the end of the function.

You are also deleting the multipart before it's been sent.

AliReza Beytari

@SGaist Thank you. Now I can get the response, but response returns that file are not selected to upload!!

AliReza Beytari

@AliReza-Beytari Oh, I forgot to send "filename" !! Now it completely works.

imagePart.setHeader(QNetworkRequest::ContentDispositionHeader,
                        QVariant("form-data; name=\"userfile[]\"; filename=\"test.png\""));

AliReza Beytari

I use this code for parsing the HTML codes:

void MainWindow::onReqFinished(QNetworkReply *reply)
{
	QString source = QString::fromUtf8(reply->readAll());
	QWebPage page;
	page.mainFrame()->setHtml(source);
	QWebElement parse = page.mainFrame()->documentElement();
	QString count = QString::number(parse.findAll("a").count());
	QMessageBox::information(this, "Count", src);
}

But "count" returns "0"; even though html code has "a" tag !!
Where is the problem?!

SGaist

How do you count returns 0 ?

AliReza Beytari

@SGaist Because the QMessageBox shows "0" !!

raven-worx

@AliReza-Beytari
now the question is what reply->readAll() really returns.
Or possibly the response is a HTTP redirect? In such a case you would need check that for yourself and reissue a new request to the redirected url.

SGaist

You don't pass count to your message box but src.

AliReza Beytari

@raven-worx I have checked reply->readAll(). It completely works and returns the HTML contents.

@SGaist Yes. I forgot to change the code in forum. I pass the count variable but still returns "0" :(

AliReza Beytari

This is the HTML contents that I get (it has some Persian words [utf-8]):

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript">
</script>
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    <meta http-equiv="Content-Language" content="fa" />
    <meta http-equiv="imagetoolbar" content="no" />
    <meta name="google-site-verification" content="_DnZc06HuVAYaR1HLuYKYIgs9j8ofaXd2FgBrNX9Pd8" />
    <meta name="version" content="Mihalism Multi Host v5.0.3" />
    <meta name="subject" content="آپلود تصاویر" />
    <meta name="Revisit-After" content="1 Days" />
    <meta name="Distribution" content="Global" />
    <meta name="Author" content="Hadi Behgam" />
	<meta name="ROBOTS" content="INDEX, FOLLOW, ALL" />
	<meta name="generator" content="آپلود , آپلود عكس , آپلود سنتر , آپلود فايل , آپلود دائمي , آپلود نامحدود , آپلود رايگان , آپلود تصوير" />
    <meta name="keywords" content="آپلود عکس,آپلود رایگان عکس,آپلود سنتر عکس,آپلودعکس,سایت آپلود عکس,آپلود عکس دائمی,آپلود عکس رایگان,آپلود,آپلود تصاویر" />
    <meta name="description" content="آپلود عکس,آپلود سنتر عکس,سایت آپلود عکس,آپلود عکس دائمی,آپلود عکس رایگان,آپلود,آپلود عکس عمومی,عکس,آپلود تصاویر" />
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I also get this error: "QNetworkReplyImplPrivate::error: Internal problem, this method must only be called once."

raven-worx

@AliReza-Beytari said:

I also get this error: "QNetworkReplyImplPrivate::error: Internal problem, this method must only be called once."

This warning is raised when you call error() multiple times on the network reply.
Do you use a custom network reply or similar?

AliReza Beytari

@raven-worx said:

@AliReza-Beytari said:

I also get this error: "QNetworkReplyImplPrivate::error: Internal problem, this method must only be called once."

This warning is raised when you call error() multiple times on the network reply.
Do you use a custom network reply or similar?

No.

AliReza Beytari

"QWebElement parse" cannot return any element!!