Hi
I'm trying to write a thumbnailer class that takes a path to a photo
and creates a thumbnail at a user specified size. The code creates the
thumbnails OK, but there's this monster memory leak, to the tune of
about 100 MB every 3-4 seconds, that seems to be related to NSImage.
What's happening is that if I comment out the line that initializes a
new image, the memory leak disappears. I've tried forcibly releasing
the images, tried autoreleasing them, tried creating a fixed size
buffer into which all the images are read, nothing seems to work.
I'm using garbage collection, so that along with the deliberate
releasing of the images, makes me wonder why the collector isn't
getting the hint, that it's ok to release the memory for these photos.
Could someone point out what I'm doing in the following code that
prevents the images from getting released?
Thanks for any help
- (NSString *) createJPEGThumbnail:(NSString *) inPath
site:(NSString *) inSite
{
NSDictionary *siteRecord,
*pubRecord;
NSString *sourceName =
[inPath lastPathComponent],
*sourceRoot
= [sourceName stringByDeletingPathExtension],
*destName = [[sourceRoot
stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]
stringByAppendingPathExtension: @"jpg"],
*pubCode
= [self pubCodeFromPath: inPath],
*thumbPath;
NSFileManager *manager =
[NSFileManager defaultManager];
siteRecord = [thumbDirectories
objectForKey: inSite];
pubRecord = [[siteRecord objectForKey: @"publications"]
objectForKey: pubCode];
if (pubRecord == nil)
pubRecord = [[siteRecord objectForKey: @"publications"]
objectForKey: @"~MISCELLANEOUS"];
thumbPath = [[pubRecord objectForKey: @"thumb_path"]
stringByAppendingPathComponent: destName];
if (![manager fileExistsAtPath: thumbPath])
{
// I've tried both of these, didn't make the slightest
difference.
// Both leaked memory at a furious pace
// Option 1:
NSImage *image = [[[NSImage alloc] initWithContentsOfFile:
inPath] autorelease];
/* do some stuff */
// Option 2
NSImage *image = [[NSImage alloc] initWithContentsOfFile:
inPath];
/* do some stuff */
[image release];
}
// make sure it worked
if ([manager fileExistsAtPath: thumbPath])
return thumbPath;
else
return nil;
}
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