In which segment of a .jpeg stores QImageWriter the data?

PowerNow

Hi, I want to read via Javascript the data from a .jpeg file stored before with QImageWriter. How and in which segment are these data saved?

I searched in the commend segment (FF FE COM Comments) but i could't find any data.

Thxs...

mrjj

Hi
what data? the compression settings etc ?
to produce a valid jpg file, it must save the data as expected for the format.
So you should be able to open it like any other jpeg file ?

PowerNow

@mrjj The QImageWriter was succesful because I read the data via QImageReader. The point is I have to read this data in a browser via Javascript. The data are arbitrary, currently only for testing.

jsulm

@PowerNow Can you please explain what data you mean? It is really unclear what you mean and what your use case is...

PowerNow

@jsulm: The data are arbitrary strings. E.g. I saved them with

QImageWriter writer;
writer.setFileName("...jpg");
writer.setText("key1", "Teststring1");
writer.setText("key2", "Teststring2");
...
writer.write(image);

In Qt everthing is fine!
Is it possible that they are SEPERATELY saved under the commend segment (FF FE COM Comments)?

PowerNow

For who is interrested: The strings saved via QImageWriter are placed seperately in the commend section of a .jpeg as ascii characters.