void FileUploader::postProcesser3()
{
    qDebug() << "uploading 3";

    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\"; filename=\"1.jpg\""));
    QFile *file = new QFile("1.jpg");
    qDebug() << 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://localhost/medialinks/ci/index.php/data/fileupload_test/");
    QNetworkRequest request(url);

    //QNetworkAccessManager manager;
    QNetworkAccessManager * manager = new QNetworkAccessManager();
    QNetworkReply *reply = manager->post(request, multiPart);
    multiPart->setParent(reply); // delete the multiPart with the reply

    // here connect signals etc.
    connect(manager, SIGNAL(finished(QNetworkReply*)), SLOT(replyFinished(QNetworkReply*)));
    connect(reply, SIGNAL(uploadProgress(qint64,qint64)), this, SLOT(SlotSetProgressLevel(qint64, qint64)));

    connect(reply, SIGNAL(error(QNetworkReply::NetworkError)),
             this, SLOT  (uploadError(QNetworkReply::NetworkError)));
}

void FileUploader::uploadError(QNetworkReply::NetworkError)
{
    qDebug() << "error";
}

void FileUploader::SlotSetProgressLevel(qint64, qint64)
{
    qDebug() << "uploading progress";
}

void FileUploader::replyFinished(QNetworkReply* reply)
{
    qDebug() << "upload finished";

    qDebug() << reply->readAll();
}

but I don't get any error or finished signal but the file also not uploaded. This is the debugging result

uploading 3
true
qt.network.ssl: QSslSocket: cannot resolve SSLv2_client_method
qt.network.ssl: QSslSocket: cannot resolve SSLv2_server_method

this is server script it's in codeigniter(php)

public function fileupload_test()
	{
		$this->load->library('upload');
		$config['upload_path'] = $this->config->item('server_path').'data/event/'.'w_full';
		$config['file_name'] = "f.jpg";

		$config['allowed_types'] = '*';
		$this->upload->initialize($config);
		if(!$this->upload->do_upload('image')){

			//upload error
			echo "file uploading failed";
			//var_dump($this->upload->display_errors());
			
			// remove created posts
			//$this->teamdb->remove_unsuccesfull_post($ids);
			exit;
		} else {

			// success, add data to database
			echo 'success';
		}
	}

Thanks