CODEWITHSUNDEEP
iosobjective-cunicodehex
iGagan Kumar
iGagan Kumar

Reputation: 406

Convert an string to unicode in objective C

I need to convert a string to unicode (hex) char, I am to to do unicode to string using the below code

[NSString stringWithFormat:@"%C",0x2665];

but I am not able to exactly reverse of this.

What will be the code snippet for this

Upvotes: 1

Views: 3270

Answers (3)

RGB_DS
RGB_DS

Reputation: 118

custom unicode to emoji


#define EmojiCodeToSymbol(c) ((((0x808080F0 | (c & 0x3F000) >> 4) | (c & 0xFC0) << 10) | (c & 0x1C0000) << 18) | (c & 0x3F) << 24)

/// convert hexadecimal to unicode
/// NSString *v = omgEmojiConvertCode(@"0x1F580");
/// v is 🖀 (cannot be displayed), 

static inline NSString *omgEmojiConvertCode(NSString * code) {
    char *charCode = (char *)code.UTF8String;
    long intCode = strtol(charCode, NULL, 16);
    NSString *s = [NSString stringWithFormat:@"%ld",intCode];

    int symbol = EmojiCodeToSymbol([s intValue]);
    NSString *string = [[NSString alloc] initWithBytes:&symbol length:sizeof(symbol) encoding:NSUTF8StringEncoding];
    return string;
}

cannot be displyed is enter image description here

now you can replace this to imageName enter image description here

Upvotes: 1

Jaimish
Jaimish

Reputation: 629

Thanks to objective C. It has encoding methods which helps the Unicode to string and string to Unicode. Here is the sample.

NSString *str = @"♥";
    NSData *dataenc = [str dataUsingEncoding:NSNonLossyASCIIStringEncoding];
    NSString *encodevalue = [[NSString alloc]initWithData:dataenc encoding:NSUTF8StringEncoding];

    NSData *data = [encodevalue dataUsingEncoding:NSUTF8StringEncoding];
    NSString *decodevalue = [[NSString alloc] initWithData:data encoding:NSNonLossyASCIIStringEncoding];

    NSLog(@"%@",decodevalue);

Upvotes: 4

zneak
zneak

Reputation: 138261

It depends on what your definition of a character is. Given your example, I'd assume that [string characterAtIndex:0] is what you're looking for (get the first unichar value contained in the string, which would be 0x2665 for the string created in your first example).

However, you're getting an UTF-16 code point out of it, which may or may not be a complete logical character, and which may or may not be a complete character as printed. For instance, this will fail to represent some emojis, and will definitely fail to represent any emoji with a special skin color, or country flags. (Importantly, it can also fail to represent the characters of some languages.)

Upvotes: 1

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