Upload file to HTTP server

[produktdotestow]

Hi.
I'm trying to write class for uploading files to HTTP server. I have a one, which uses QNetworkAccessManager::post(const QNetworkRequest & request, const QByteArray & data) method, but all the time when i want to upload file - i have to load entire(!) of file content into memory (QByteArray). I decided to find a better way to do the same. I stumbled on this project:
http://code.google.com/p/datacod-qt-tools/

and in uploader.cpp file
(http://code.google.com/p/datacod-qt-...r/uploader.cpp, from line no. 85)

i found that i can do it better by creating class that inherits QIODevice and reimplementing virtual qint64 readData(char *data, qint64 maxlen) and virtual qint64 size() methods. When you want to upload file - just create instance of this class and pass it to QNetworkAccessManager::post(const QNetworkRequest & request, QIODevice * data) method. Here's prepared class:
http://code.google.com/p/datacod-qt-...er/qupfile.cpp

It seems to be a good solution and i thought that it'll work. Unfortunately - it doesn't. QUpFile::readData(char *data, qint64 maxlen) is not called even once and uploadProgress(qint64 bytesWritten, qint64 bytesTotal) signal is emitted only one time (bytesWritten = bytesTotal = 0).

Anybody have idea what's wrong with it or have another way to upload file without loading entire of its content into memory?

Thank you in advance.
Greet.

[produktdotestow]

Solved. If somebody needs help with similar problem - just write here :)

[kosasker]

I need a simple solution about this... I Keeping search too.
Regards.
Kos Asker.

[kosasker]

Here is a complete code about this thread. There is no authentication progress with this code.

void MainWindow::sendfile()
{
 
    QFile file("licensefile"); //lets get the file by filename
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))             //accessibility controll for file
    {
        qDebug() << "file open failure";   //send message if file cant open
    }
    QByteArray line;   //a qbytearray object for read file line by line
    while (!file.atEnd())
    {
        line.append(file.readLine());
    }
       //we read file line by line with no error handling for reading time!!
 
    file.close();         
    QByteArray boundary;  //actually i cant understand that why we are using a second byte array for file sending.
// if someone know this trick please write below. I write this code like the other examples.
 
    QByteArray datas(QString("--" + boundary + "\r\n").toAscii());
    datas += "Content-Disposition: form-data; name=\"file\"; filename=\""+file.fileName()+"\"\r\n";
//here is the http header for manuplate a normal http form and form file object
 
    datas += "Content-Type: image/jpeg\r\n\r\n"; //file type is here
    datas += line; //and our file is giving to form object
    datas += "\r\n";
    datas += QString("--" + boundary + "\r\n\r\n").toAscii();
    datas += "Content-Disposition: form-data; name=\"upload\"\r\n\r\n";         
    datas += "Uploader\r\n";
    datas += QString("--" + boundary + "--\r\n").toAscii();
 
    QNetworkRequest req;
    req.setUrl(QUrl("http://192.168.0.167/input.php"));    //my virtual servers' ip address and tiny php page url is here
    req.setRawHeader("Content-Type", "multipart/form-data; boundary=" + boundary);  // we must set the first header like this. its tell the server, current object is a form
 
    QNetworkAccessManager *manager = new QNetworkAccessManager;     //using qnetwork access manager for post data
 
    connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(erroron_filesend(QNetworkReply*)));    //connecting manager object for errors here
    manager->post(req,datas); //send all data    
 
}
 
void MainWindow::erroron_filesend(QNetworkReply *replye)
{
    if (replye->error() !=0)
        {
            QMessageBox::information(this,"Connection Error",replye->errorString());
            return;
        }
        else
        {
            QString message_d = QString("Upload Complete");
            QMessageBox::information(this, "Upload Complete", message_d);
            return;
        }
}

void MainWindow::sendfile()
{

    QFile file("licensefile"); //lets get the file by filename
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))             //accessibility controll for file
    {
        qDebug() << "file open failure";   //send message if file cant open
    }
    QByteArray line;   //a qbytearray object for read file line by line
    while (!file.atEnd())
    {
        line.append(file.readLine());
    }
       //we read file line by line with no error handling for reading time!!

    file.close();         
    QByteArray boundary;  //actually i cant understand that why we are using a second byte array for file sending.
// if someone know this trick please write below. I write this code like the other examples.

    QByteArray datas(QString("--" + boundary + "\r\n").toAscii());
    datas += "Content-Disposition: form-data; name=\"file\"; filename=\""+file.fileName()+"\"\r\n";
//here is the http header for manuplate a normal http form and form file object
                                                                                                                                                   
    datas += "Content-Type: image/jpeg\r\n\r\n"; //file type is here
    datas += line; //and our file is giving to form object
    datas += "\r\n";
    datas += QString("--" + boundary + "\r\n\r\n").toAscii();
    datas += "Content-Disposition: form-data; name=\"upload\"\r\n\r\n";         
    datas += "Uploader\r\n";
    datas += QString("--" + boundary + "--\r\n").toAscii();

    QNetworkRequest req;
    req.setUrl(QUrl("http://192.168.0.167/input.php"));    //my virtual servers' ip address and tiny php page url is here
    req.setRawHeader("Content-Type", "multipart/form-data; boundary=" + boundary);  // we must set the first header like this. its tell the server, current object is a form

    QNetworkAccessManager *manager = new QNetworkAccessManager;     //using qnetwork access manager for post data
      
    connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(erroron_filesend(QNetworkReply*)));    //connecting manager object for errors here
    manager->post(req,datas); //send all data    
    
}

void MainWindow::erroron_filesend(QNetworkReply *replye)
{
    if (replye->error() !=0)
        {
            QMessageBox::information(this,"Connection Error",replye->errorString());
            return;
        }
        else
        {
            QString message_d = QString("Upload Complete");
            QMessageBox::information(this, "Upload Complete", message_d);
            return;
        }
}

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Php Code

<?php
$filename = $_FILES['file']['name'];
$source = $_FILES['file']['tmp_name'];
$target = 'upload/'.$filename;
move_uploaded_file($source, $target)
?>

<?php
$filename = $_FILES['file']['name'];
$source = $_FILES['file']['tmp_name'];
$target = 'upload/'.$filename;
move_uploaded_file($source, $target)
?>

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Its a very simple code and dont try to upload big files (up to 1 Mbyte) with this code.
This one is very dirty i know. Its will be helpfull, i wish... Sorry for bad English. Regards.

[hugocongtu]

Hi produktdotestow,

I'm quite interested in your project http://code.google.com/p/datacod-qt-tools/ because I'm currently developing an upload manager with Qt and using .NET web service at the server side. I read your code but I realized that you use a form at the server side. So in my case, how can pass parameters (username and password) and QUpFile to web service.

thank you very much!
Trung

[produktdotestow]

This
http://code.google.com/p/datacod-qt-tools/
is not my project, but it's not important.

As i understood you want to upload file and pass username and password to server, yes?

1. Get working QUpFile class
2. Create instance
3. Set head and tail using setHead and setTail methods

upfile->setHead("------------hKdQAaQIL4zeExpbXAmwlW\r\nContent-Disposition: form-data; name=\"username\"\r\n\r\nusername\r\n------------hKdQAaQIL4zeExpbXAmwlW\r\nContent-Disposition: form-data; name=\"password\"\r\n\r\npassword\r\n------------hKdQAaQIL4zeExpbXAmwlW\r\nContent-Disposition: form-data; name=\"file\"; filename=\"yourFileName\"\r\nContent-Type: application/octet\r\n\r\n");
upfile->setTail("\r\n------------hKdQAaQIL4zeExpbXAmwlW--");

upfile->setHead("------------hKdQAaQIL4zeExpbXAmwlW\r\nContent-Disposition: form-data; name=\"username\"\r\n\r\nusername\r\n------------hKdQAaQIL4zeExpbXAmwlW\r\nContent-Disposition: form-data; name=\"password\"\r\n\r\npassword\r\n------------hKdQAaQIL4zeExpbXAmwlW\r\nContent-Disposition: form-data; name=\"file\"; filename=\"yourFileName\"\r\nContent-Type: application/octet\r\n\r\n");
upfile->setTail("\r\n------------hKdQAaQIL4zeExpbXAmwlW--");

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4. Create QNetworkRequest object and set Content-Type header like that:

request.setHeader(QNetworkRequest::ContentTypeHeader, "multipart/form-data; boundary=----------hKdQAaQIL4zeExpbXAmwlW");

request.setHeader(QNetworkRequest::ContentTypeHeader, "multipart/form-data; boundary=----------hKdQAaQIL4zeExpbXAmwlW");

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5. Use

QNetworkReply* QNetworkAccessManager::post(const QNetworkRequest &request, QIODevice *data)

QNetworkReply* QNetworkAccessManager::post(const QNetworkRequest &request, QIODevice *data)

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to post your request to server:

QNetworkReply *reply = networkAccessManager->post(request, upfile);

QNetworkReply *reply = networkAccessManager->post(request, upfile);

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