mmap quiet failure - all reads are 0x00
mmap quiet failure - all reads are 0x00
- Subject: mmap quiet failure - all reads are 0x00
- From: Trygve Inda <email@hidden>
- Date: Fri, 05 Feb 2016 10:09:31 -0800
- Thread-topic: mmap quiet failure - all reads are 0x00
I have image data that is stored in a 150mb file which I use mmap to read.
The image data is pulled into a NSBitmapImageRep pixel by pixel and
eventually shows on the screen. Only a subset of the pixel in the mmap file
are pulled into a single NSBitmapImageRep.
A few customers (and I have seen it happen here a couple times too) are
reporting that sometimes the image just turns solid black.
It seems like no matter what is in the mmap file, when I read from it I get
0x00 for every byte and no error or exception is generated. I can't
reproduce it as it is very random. Quitting and relaunching solves it.
Any ideas?
Trygve
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