Re: NSKeyedArchiver finishEncoding takes forever
Re: NSKeyedArchiver finishEncoding takes forever
- Subject: Re: NSKeyedArchiver finishEncoding takes forever
- From: Markus Spoettl <email@hidden>
- Date: Wed, 18 Jun 2008 20:48:30 -0700
On Jun 18, 2008, at 2:41 PM, Michael Ash wrote:
Although it partially defeats the purpose of using NSCoder, you'll
avoid this whole path if you stuff all four doubles into a single
NSData. Don't forget to use the byte-swapping functions to ensure that
they all have a consistent representation across architectures.
Well, what can I say, you and Quincey Morris are absolutely right.
This is the way to go.
The same data set takes just 4 seconds to store with a file size of
17.2MB.
Thanks for all the help guys! For the record I'm posting the code below.
Regards
Markus
- (void)encodeDouble:(double)value forKey:(NSString *)key withCoder:
(NSCoder *)encoder
{
NSSwappedDouble sd = NSSwapHostDoubleToLittle(value);
[encoder encodeBytes:(const uint8_t *)&sd
length:sizeof(NSSwappedDouble) forKey:key];
}
- (double)decodeDoubleForKey:(NSString *)key withCoder:(NSCoder
*)decoder
{
double result = 0.0;
NSUInteger retsize;
NSSwappedDouble *sd = (NSSwappedDouble *)[decoder
decodeBytesForKey:key returnedLength:&retsize];
if (retsize == sizeof(NSSwappedDouble)) {
result = NSSwapLittleDoubleToHost(*sd);
}
return result;
}
--
__________________________________________
Markus Spoettl
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