Cover Browser goes blank.

Ericp · 06-17-2012, 09:26 AM

Sorry if this has a discussion somewhere, but I cannot find anything.

Trying to manipulate a large database using the cover browser, I have discovered that the browser breaks down and goes blank if a certain number of records is passed.

This number is 32768. Up to this record number the browser works well but passing this number results in a blank browser.

The number 32768 is familiar for some reason, perhaps I exceed a set variable?

Any ideas please?

Thanks

kovidgoyal · 06-17-2012, 11:29 AM

32768 = 2**15

Sounds like an integer overflow, however since the cover browser use the int datatype which is capable of storing much larger numbers, I dont see why 2**15 should overflow, and I really dont feel like creating such a large library to track it down.

kovidgoyal · 06-17-2012, 11:47 PM

I remembered I had a script to generate large database with random data and used it to generate a library with 40k entries. Covers for entries number 40,000 and 39,999 showed up in the cover browser for me.

06-17-2012, 09:26 AM	#1
Ericp Junior Member Posts: 5 Karma: 10 Join Date: Feb 2011 Device: Kindle and Sovos Reader	Cover Browser goes blank. Sorry if this has a discussion somewhere, but I cannot find anything. Trying to manipulate a large database using the cover browser, I have discovered that the browser breaks down and goes blank if a certain number of records is passed. This number is 32768. Up to this record number the browser works well but passing this number results in a blank browser. The number 32768 is familiar for some reason, perhaps I exceed a set variable? Any ideas please? Thanks

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06-17-2012, 11:29 AM	#2
kovidgoyal creator of calibre Posts: 43,871 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	32768 = 215 Sounds like an integer overflow, however since the cover browser use the int datatype which is capable of storing much larger numbers, I dont see why 215 should overflow, and I really dont feel like creating such a large library to track it down.

06-17-2012, 11:47 PM	#3
kovidgoyal creator of calibre Posts: 43,871 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	I remembered I had a script to generate large database with random data and used it to generate a library with 40k entries. Covers for entries number 40,000 and 39,999 showed up in the cover browser for me.

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