Creating a NSArray from a C Array

Question

There are many threads about going the opposite way, but I am interested in converting from a primitive C array to a NSArray. The reason for this is that I want to create a NSString from the array contents. To create the NSString I will use:

NSArray *array;
NSString *stringFromArray = [array componentsJoinedByString:@","];

I am joining the elements of the array by commas because I will later be saving the string as a .csv file. I don't think it matters, but the C array I am dealing with is of type double and size 43.

double c_array = new double [43];

Thanks!

There's no automatic boxing in ObjC even for primitive types, let alone arrays. So you won't be able to do that without a loop. But if you're coding a loop, you might as well do your string concatenation within that loop - no need to spend time and memory on building a NSArray first. — Seva Alekseyev
– Seva Alekseyev, Commented Nov 10, 2011 at 21:47
double c_array = new double[43]; isn't any C array I've ever heard of. — Chris Lutz
– Chris Lutz, Commented Nov 10, 2011 at 22:20

Michael Dautermann · Accepted Answer · 2011-11-10 21:44:45Z

6

NSString * stringFromArray = NULL;
NSMutableArray * array = [[NSMutableArray alloc] initWithCapacity: 43];
if(array)
{
    NSInteger count = 0;

    while( count++ < 43 )
    {
        [array addObject: [NSString stringWithFormat: @"%f", c_array[count]]];
    }

    stringFromArray = [array componentsJoinedByString:@","];
    [array release];     
}

answered Nov 10, 2011 at 21:44

Michael Dautermann

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1 Comment

Kevin_TA Over a year ago

Great! Thanks! Only change I made was using a for loop instead of your while loop. The first count value was 1. I needed 0 to access the first element of c_array. Otherwise extremely helpful.

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