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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