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Objective-C Encoding Enumerations

The constants listed in Table 2.4 are the string encodings provided by the NSString class. You’ll use these encodings for the specified operating system so that the characters being encoded have the proper, understandable codes so that they are appropriately displayed. For example, if you are exporting text from your app that you know is going to a platform that does not support Unicode, you should encode it to the ASCII format using the NSASCIIStringEncoding constant.

Table 2.4 Encoding Formats

Enum

Name

Value Description

NSASCIIStringEncoding

1

Supports only lower-value, 0–127, ASCII characters. No support for higher-bit characters. You’ll want to use this only if characters need to be in 7-bit ASCII.

NSNEXTSTEPStringEncoding

2

Supports encoding used by NeXT.

NSJapaneseEUCStringEncoding

3

Supports a variable-width encoding used to represent the elements of three Japanese character set standards (JIS X 0208, JIS X 0212, JIS X 0201).

NSUTF8StringEncoding

4

Allows for full Unicode support. Characters display as ASCII when the text is plain English.

NSISOLatin1StringEncoding

5

Encoding for European characters as high-bit ASCII (values 128–255). Also cross-platform international standard. Very common for Web sites to deliver their text in this format.

NSSymbolStringEncoding

6

Way for symbol characters to be encoded.

NSNonLossyASCIIStringEncoding

7

Similar to NSASCIIStringEncoding. Reinforces no high-bit characters.

NSShiftJISStringEncoding

8

Supports Shift Japanese Industrial Standards encoding.

NSISOLatin2StringEncoding

9

Supports ISO/IEC 8859 encoding of European languages.

NSUnicodeStringEncoding

10

Encodes all characters as two bytes. Marker bytes exist at the beginning of the file stream to signify whether the byte order is little or big endian.

NSWindowsCP1251StringEncoding

11

Supports Cyrillic text. This is the same as AdobeStandardCyrillic.

NSWindowsCP1252StringEncoding

12

Supports “WinLatin1” encoding. This is the most common for European/English text. Windows boxes that host Web sites deliver their context in this format.

NSWindowsCP1253StringEncoding

13

Supports “Greek” encoding.

NSWindowsCP1254StringEncoding

14

Supports “Turkish” encoding.

NSWindowsCP1250StringEncoding

15

As with Latin1, supports “WinLatin2” encoding.

NSISO2022JPStringEncoding

21

Japanese encoding for e-mail.

NSMacOSRomanStringEncoding

30

Default encoding for the Mac.

NSUTF16StringEncoding =

Supports UTF16.

NSUnicodeStringEncoding

NSUnicodeStringEncoding is an alias for NSUTF16qStringEncoding.

NSUTF16BigEndianStringEncoding

0x90000100

NSUTF16StringEncoding encoding with explicit endianness specified.

NSUTF16LittleEndianStringEncoding

0x94000100

NSUTF16StringEncoding encoding with explicit endianness specified.

NSUTF32StringEncoding

0x8c000100

Convert NSString to NSUTF32StringEncoding.

NSUTF32BigEndianStringEncoding

0x98000100

NSUTF32StringEncoding encoding with explicit endianness specified.

NSUTF32LittleEndianStringEncoding

0x9c000100

NSUTF32StringEncoding encoding with explicit endianness specified.

NSProprietaryStringEncoding

65536

As the name of the enum infers, used for custom, proprietary encodings.

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