[Solved]QNetworkAccessManager Upload Image to WebService

flaviomarcio

Hello, I try to upload an image with QNetworkAccessManager to webServiceREST, and I have no success.

I know he works with Delphi. Tested and confirmed.

With Qt I load all the bytes to the server, but the error occurs at the end.

what I did wrong in Qt?

Application message:

starting D:\projetos\Zdemos\qt\rest\Demo1\build-restDemo1-Desktop_Qt_5_2_1_MinGW_32bit-Debug\debug\restDemo1.exe...
bytesSent == 16384 == 85848 bytesTotal
bytesSent == 85848 == 85848 bytesTotal
299 == slotError
bytesSent bytesTotal == 0 == 0
statusCodeV. == "500"

web service error:
{"error": "TsmServerMethodsUnit.updateUploadImagem method not found in the list server method"}

Application terminate.

Notes:
1-Metode updateUploadImagem not exist in the webservice, is the correct metode UploadImagem I not then inform metode updateUploadImagem name, Qt did THAT?

2)The parameter in webservice is a Stream.

3)In example in delphi, I make execute perfect.

code:

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

ui->lineEdit->setText("http://www.mechame.homeip.net:8080/datasnap/rest/DSAdmin/GetPlatformName");

this->manager = new QNetworkAccessManager(this);
QObject::connect(this->manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(finishedSlot(QNetworkReply*)));

}
@

@

void MainWindow::on_pushButton_3_clicked()
{

QString filePath("C:/TEMP/0.jpg");
QUrl url("http://www.mechame.homeip.net:8080/datasnap/rest/TsmServerMethodsUnit/UploadImagem");


QFile *file = new QFile&#40;filePath&#41;;
file->open(QIODevice::ReadOnly&#41;;

QNetworkRequest request;
request.setUrl(url&#41;;
//request.setHeader(QNetworkRequest::ContentTypeHeader,"application/octet-stream"); //Required!
request.setHeader(QNetworkRequest::ContentTypeHeader,"text/plain"); //Required!

QNetworkReply *reply = this->manager->post(request,file->readAll());
file->setParent(reply);

QObject::connect(reply, SIGNAL(uploadProgress(qint64,qint64)), this, SLOT(onUploadProgress(qint64,qint64)));
QObject::connect(reply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(slotError(QNetworkReply::NetworkError)));

}

@

@void MainWindow::finishedSlot(QNetworkReply* reply)
{

QMessageBox msgBox;

QVariant statusCodeV =reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
// "200 OK" received?

qDebug()<<"statusCodeV.=="<<statusCodeV.toString();

QByteArray bytes = reply->readAll(); // bytes
const QString string(bytes); // string

ui->textBrowser->setText(string);


if (statusCodeV.toInt()==200)
{
    msgBox.setText("Successfull!...");
}
else
{
    msgBox.setText("UnSuccessfull!...");
}
msgBox.exec&#40;&#41;;

}

void MainWindow::slotReadyRead()
{
//Q_UNUSED(request);
}

void MainWindow::slotSslErrors(QList<QSslError> erros)
{
qDebug()<<"slotSslErrors=="<<erros;
}

void MainWindow::slotError(QNetworkReply::NetworkError error)
{
qDebug()<<"slotError=="<<error;
}

@

JKSH

Hi,

Please edit your post and add '@' before and after your code. It's very hard to read.

flaviomarcio

Sorry, I organize better.

ThatDude

It looks like "data snap requires the stream to be in JSON format":http://stackoverflow.com/questions/18110654/upload-file-to-datasnap-rest-server-via-tstream
It is required "to quote Method name":http://docwiki.embarcadero.com/RADStudio/XE5/en/DataSnap_REST_Messaging_Protocol - at least while I was testing with your server it didn't accept unquoted names/properties

Then all you have to do is to create/print the binary data/bytes to a JSON string e.g.: [37,80,68,70,45,49,46,51,13,10]

@
QUrl url("http://www.mechame.homeip.net:8080/datasnap/rest/TsmServerMethodsUnit/%22UploadImagem%22/");
// ...read a file
QByteArray baFile = file->readAll();
QString json("[");
json.reserve(baFile.size()*4);
for (int i=0; i<baFile.size(); ++i)
json.append(QString("%1,").arg((unsigned char)baFile[i]));
if (json.size() > 1)
json.resize(json.size()-1);
json.append("]");
QByteArray ba (json.toStdString().c_str());

QNetworkReply *reply = this->manager->post(request, ba);

@

@
finishedSlot()
{"result":["4D006A61EA3F37DD54E0A3C3DD85ADE9"]}
Successfull!...@

NB! If you copy and paste - remove the zero width space I had to insert between % and 22 otherwise it wouldn't print properly.

flaviomarcio

Wow, okay, thank you.