Converting NSString to unichar in iOS

Question

I have seen questions in stackoverflow that convert unichar to NSString but now I would like to do the reverse.

How do i do it?

Need some guidance.. Thanks

For example, I have an array of strings:[@"o",@"p",@"q"];

These are strings inside. How do i convert it back to unichar?

You mean an array of `unichar`? There's a method on `NSString` that will do that. — jscs, Mar 06 '13 at 17:38
Possible duplicate of [this question](http://stackoverflow.com/questions/1354388/unichar-and-nsstring-how-interchangeable-are-these) — bdesham, Mar 06 '13 at 17:39

score 13 · Accepted Answer · answered Mar 06 '13 at 17:39

13

The following will work as long as the first character isn't actually two composed characters (in other words as long as the character doesn't have a Unicode value greater than \UFFFF):

unichar ch = [someString characterAtIndex:0];

answered Mar 06 '13 at 17:39

rmaddy

314,917
42
532
579

score 2 · Answer 2 · answered Mar 06 '13 at 17:45

2

You could convert it to a buffer in NSData:

if ([string canBeConvertedToEncoding:NSUnicodeStringEncoding]) {
    NSData * data = [string dataUsingEncoding:NSUnicodeStringEncoding];
    const unichar* const ptr = (const unichar*)data.bytes;
    ...
}

answered Mar 06 '13 at 17:45

justin

104,054
14
179
226

1

Does this produce a different result than just casting the return value of `[string cStringUsingEncoding:NSUnicodeStringEncoding]`? – Seamus Campbell Mar 06 '13 at 17:48
@SeamusCampbell the `NSData` variant is not terminated – justin Mar 06 '13 at 17:57
Beware: this add a BOM which may or may not be desired! – ceztko Feb 28 '20 at 14:25

Converting NSString to unichar in iOS

2 Answers2