How to Send QML image to C++ side

isan

I want to send the image from qml to c++ to be stored in the SQL database
This is my code, but when I click the save button, my program crashes
How can I fix it?

c++ side:

void ImageProvider::saveToDatabase(QObject *imageObj) {
QQuickItemGrabResult *item = nullptr;
  item = qobject_cast<QQuickItemGrabResult *>(imageObj);
  QImage img(item->image());
  QByteArray imageArray;
  QBuffer buffer(&imageArray);
  buffer.open(QIODevice::WriteOnly);
  img.save(&buffer, "PNG");
 dbModify->dbinsertRecords(imageArray);
}

qml side:

Page {
  property alias url: screenshoot.source //set source from another place
 Image {
         id: screenshoot
         }
 Button {
            id: button
            onClicked: {
                imgProvider.saveToDatabase(screenshoot)
            }
        }
}

SGaist

Are you trying to implement something like described here ?

SGaist

Hi,

You don't check that item is a valid pointer.

isan

@SGaist said in How to Send QML image to C++ side:

item is a valid pointer

You mean this?

void ImageProvider::saveToDatabase(QObject *imageObj) {
 QQuickItemGrabResult *item = nullptr;
  item = qobject_cast<QQuickItemGrabResult *>(imageObj);
  if (item) {
    QImage img(item->image());
  QByteArray imageArray;
  QBuffer buffer(&imageArray);
  buffer.open(QIODevice::WriteOnly);
  img.save(&buffer, "PNG");
 dbModify->dbinsertRecords(imageArray);
    }
}

The program does not crash, but nothing is stored in the database, the way that I send image to c++ is true?

SGaist

Are you trying to implement something like described here ?

isan

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