Converting an int[] to an NSArray?

That Don Guy · March 2010

I have an array of integers (i.e. an int[]) that I would like to saved into NSUserDefaults. However, when I try this:


// \"defaults\" is an NSUserDefaults variable, initialized to NSStandardUserDefaults
// int savingValues[100] has its values set dynamically in code
	
NSArray *savingArray = [[NSArray alloc] initWithObjects:savingValues count:100];
[defaults setObject:savingArray forKey:@\"thisApp_Defaults\"];

I get a "passing argument 1 from incompatible pointer type" warning in my initWithObjects call, and the values aren't saved correctly.
Isn't the intent of initWithObjects:count: to be able to create an NSArray from a C array? (Or does "C array" not include "Objective-C array"?)

Pretty much the same thing happens when I copy savingValues into an NSMutableArray and then try to create savingArray from that using initWithArray).

-- Don

BrianSlick · March 2010

A quick perusal of the documentation for that method indicates that the contents of the C array should be objects. They absolutely need to be objects for the NSArray.

flamingliquid · March 2010


int savingValues[100];
NSMutableArray *savingArray = [[NSMutableArray alloc] initWithCapacity:100];

for (int i = 1; i < 101; i++) {
      NSNumber *n = [[NSNumber alloc] initWithInt:savingValues[i]];
      [savingArray addObject:n];
      [n release];
}
[defaults setObject:savingArray forKey:@\"thisApp_Defaults\"];

Untested, but it works in my mind :P

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Converting an int[] to an NSArray?

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