Is it possible to access the Exif thumbnail of a JPEG file using only Qt 5.8 functionality and not an external library?
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1Given that `libjpeg` itself is written in C, the answer should be pretty obvious... – Andrew Henle Apr 04 '17 at 11:20
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`libjpeg` is an extarnal library. Does Qt itself provide such functionality? (By C++ or C I meant that I don't search for a Python etc. solution.) – user3224237 Apr 04 '17 at 11:25
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maybe this will help you -> http://stackoverflow.com/questions/1286662/is-there-any-sample-code-to-read-thumbnail-from-jpeg-exif-header – baddger964 Apr 04 '17 at 11:30
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Possible duplicate of http://stackoverflow.com/questions/15128656/read-exif-metadata-of-images-in-qt – Massimo Callegari Apr 04 '17 at 12:36
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I think you need to import the old Nokia times sources when there was a Qt Extended module, with classes like QExifImageHeader, which had a thumbnail() method. See also QTBUG-9414
Massimo Callegari
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So this means that Qt 5.8 does not provide a way to extract the Exif thumbnail _by itself_? – user3224237 Apr 04 '17 at 20:16
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Qt doesn't do everything. That's why specialized libraries/classes exist. It's like asking if Qt does FFT. Answer: no. – Massimo Callegari Apr 04 '17 at 21:35
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There is a objection. You did mention that Qt 4.4 did provide a way. I don't care if Qt does the work itself or if it uses libjpeg. – user3224237 Apr 04 '17 at 22:16
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Objection rejected. Qt extended was not part of the Qt framework. It was an external module provided only in the Qtopia project when Nokia attempted to build phones with an OS based on Qt. In any case **I did** provided an answer which uses **only Qt functionality** so you should accept/vote it. If you're afraid to drag 1 additional class in your project, then it's another story. – Massimo Callegari Apr 05 '17 at 07:09