extracting the mantissa for a NSDecimal
extracting the mantissa for a NSDecimal
- Subject: extracting the mantissa for a NSDecimal
- From: Olivier <email@hidden>
- Date: Tue, 29 Oct 2002 12:37:35 -0600
i'm trying to save an NSDecimal in a dictionary.
I study the NSDecimal structure and decided that all i really need to
save are:
_exponent, _isNegative and _mantissa field
i'm trying to get the mantissa field, i want to store it as a NSNumber
in my dictionary.
the length field of the NSDecimal tells how many short of the mantissa
are relevant
so i'm building my data this way:
NSMutableData *theNumberData = [NSMutableData
dataWithLength:16];
for (i = 0; i < valueOfObject._length; i++)
{
[theNumberData replaceBytesInRange: NSMakeRange(16 -
(i+1) * 2, 2)
withBytes:
&valueOfObject._mantissa[i]];
}
so that the relevant field are put in the data object starting from the
end of the object (most significant bytes first)
then start the problem, converting it to an NSNumber i tried:
const char *theNumberPtr = [theNumberData bytes];
[NSNumber numberWithUnsignedLongLong: *theNumberPtr]
[NSNumber numberWithUnsignedLongLong: theNumberPtr[0]]
[NSNumber numberWithUnsignedLongLong: &theNumberPtr]
without any success.
Any idea of how to get that mantissa in a NSNumber?
Olivier
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