Re: how to cache images
Re: how to cache images
- Subject: Re: how to cache images
- From: "Gerriet M. Denkmann" <email@hidden>
- Date: Sun, 09 Jun 2013 07:39:02 +0700
On 9 Jun 2013, at 06:23, Jens Alfke <email@hidden> wrote:
>
> On Jun 8, 2013, at 12:24 PM, Ken Thomases <email@hidden> wrote:
>
>> I haven't done the experiment, but I don't believe this is necessarily true. NSBitmapImageRep is documented (in the Snow Leopard release notes) as keeping the original image data and not re-encoding or exploding file sizes on being saved.
>
> I did not know this — guess I haven’t been reading the release notes closely enough.
url = some/picture.gif
NSDataReadingOptions mask = 0; // NSDataReadingUncached
NSData *data = [ NSData dataWithContentsOfURL: url options: mask error: &outError ];
got 19420 bytes
NSImage *image = [ [ NSImage alloc ] initWithContentsOfURL: url ];
BOOL ok = [ NSArchiver archiveRootObject: image toFile: @"/tmp/anImage" ];
got 307559 bytes (NSKeyedArchiver adds another half kB)
This 16-fold increase of data is - regardless of image quality - not acceptable for my purposes.
So I will use dataWithContentsOfURL (and switch to NSURLConnection once the unresponsiveness of the app becomes annoying).
I still have no idea why my image delegate never gets messaged. But not important anymore.
Kind regards,
Gerriet.
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