Re: NSImage and F_NOCACHE
Re: NSImage and F_NOCACHE
- Subject: Re: NSImage and F_NOCACHE
- From: Matt Neuburg <email@hidden>
- Date: Wed, 04 Oct 2006 11:38:46 -0700
- Thread-topic: NSImage and F_NOCACHE
On Wed, 4 Oct 2006 11:48:13 -0400, Alexander Cohen
<email@hidden> said:
>Hi,
>
>Im using F_NOCACHE with fcntl just before loading the file up as an
>NSImage so the data does not get cached and memory stays down. Im
>doing this because im converting thousands of images ( eps, tif, psd,
>pdf, anything... ). Thing is, memory never comes down. I though it
>might be a memory leak or something so i brought the code down to this:
>
>
>int err = 0;
>int fd = open( [self cString], O_RDWR );
>err = fcntl(fd, F_NOCACHE, 1);
>NSImage* img = [[NSImage alloc] initWithContentsOfFile:self];
>[img release];
>img = nil;
That's sort of like filling your car with gas and then driving away in a
*different* car and then being surprised that it runs out of gas right away.
Try it like this:
NSFileHandle* fh = [NSFileHandle fileHandleForReadingAtPath:myFile];
int fd = [fh fileDescriptor];
fcntl(fd, F_NOCACHE, 1);
fcntl(fd, F_RDAHEAD, 1);
NSData* pictureData = [fh readDataToEndOfFile];
[fh closeFile];
Now you've got the picture data and can make an NSImage out of it.
m.
--
matt neuburg, phd = email@hidden, <http://www.tidbits.com/matt/>
A fool + a tool + an autorelease pool = cool!
AppleScript: the Definitive Guide - Second Edition!
<http://www.amazon.com/gp/product/0596102119>
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