将双数组存储为NSNumber

Question

I have a variable double * data = malloc(sizeof(double)) in objectiveC;

I am using this variable as an double array like data[] to store some data. Now I want to add this data variable (which is an double* array) as an object NSNumber in iOS. Any idea how I can turn it into iOS object like NSNumber in iOS. Any idea how I can turn it into iOS object like NSNumber`?

Answer 1

You can use NSData to wrap an arbitrary byte buffer into an Objective-C object.

Use dataWithBytes:length: to create an NSData object from your double array, and bytes: or getBytes:length: to retrieve the data bytes back from the NSData object.

Answer 2

Based on Mundi's answer, try this:

NSMutableArray *array = [[NSMutableArray alloc] initWithCapacity:0];
for (int i = 0; i < lengthOfDoublearray; i++) { // as premitive DataType array needs predefined length
    [array  addObject:[NSNumber numberWithDouble:data[i]]];
}

Here data is array of double (that you used).

Answer 3

You cannot turn an array of primitives into one NSNumber . This does not make any sense.

You can, however, turn an array of doubles into an array of NSNumbers . Iterate through your double* array and add each number to an NSMutableArray as NSNumber using its class method numberWithDouble: .