Set metadata for imageCapture of camera

[neda]

Hi,
I use Qt version 5.6.0 with qml from windows 8.1.
I want to set metadata for captured images in QML.
I've tried the following code, the program runs on desktop takes the picture and saves it.
After I open it up with Preview and check the metadata... and nothing special there (no Author key).


camera.imageCapture.setMetadata("Author", "Neda")
camera.imageCapture.capture()

[anda_skoa]

The code for this is a bit complicated since this is plugin based, but maybe the service or the target format don't have meta data capabilities.
Do you get the imageMetaDataAvailable() signal?

Cheers,
_

[neda]

The code for this is a bit complicated since this is plugin based, but maybe the service or the target format don't have meta data capabilities.
Do you get the imageMetaDataAvailable() signal?

Cheers,
_

No.
Also I used this code, but it does not work.

Camera {
id: camera
metaData.author: "neda"

[anda_skoa]

No.

Then metadata might not be supported.

As you can see here (https://code.woboq.org/qt5/qtmultimedia/src/imports/multimedia/qdeclarativecameracapture.cpp.html#_ZN25QDeclarati veCameraCaptureC1EP7QCameraP7QObject), the metadata writer can be 0 and QDeclarativeCameraCapture::setMetadata() (same file) just forwards the values to that object if it is not 0.

You could run the application in the debugger, set a break point in setMetadata() and see if that is the case.

Cheers,
_

[neda]

QImageWriter has a method for adding text to an image file:

http://doc.qt.io/qt-5/qimagewriter.html#setText

I've tried using QImageWriter::setText(const QString & key, const QString & text) for storing copyright information or other information about the image.
But It does not work.


QImage image("c:/1.png");
QImageWriter writer("c:/11.png", "png");
writer.setText("Author", "neda");
writer.write(image);



QImage image("c:/1.jpg");
QImageWriter writer("c:/11.jpg", "jpg");
writer.setText("Author", "neda");
writer.write(image);


QImage image("c:/1.jpg");
QImageWriter writer("c:/11.png", "png");
writer.setText("Author", "neda");
writer.write(image);

[anda_skoa]

Have you checked if the image writer for the given format supports that?
See QImageWriter::supportsOption().

Cheers,
_

[neda]

Have you checked if the image writer for the given format supports that?
See QImageWriter::supportsOption().

_

This function returns true. But, none of my tries gave me any success (change data in Image Details tab properties).


void ImageSaver::save(const QString &path) const
{
QImage image("c:/3.jpeg");
QImageWriter writer("c:/3.jpg", "jpg");
if (writer.supportsOption(QImageIOHandler::Descriptio n)) ==>true
{
writer.setText("Author", "John Smith"); ==>
writer.write(image);
}
else
img_.save(path);

}