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I have an unsigned char* array1 with values >127 && <255. And I want to display it in UITextView* MyTextView and then read it back from UITextView to another unsigned char* array2. As result values in array1 should equal to values in array2.

I understand that text property of UITextView is NSString object with UTF16 encoding inside. And my codes greater then 127 are two-bite in UTF16 encoding. So if I want to display my array1 and receive read it back to array2 I need to proceed with steps:

  1. convert my one-byte char to two-byte with replacement of each char with mapping UTF18(as result my array1 will become twice bigger).
  2. convert my array1 to NSString using UTF16 encoding;
  3. convert my NSString back to array2 with UTF16encoding.
  4. convert each two-byte sequence to one byte char of array2.

How I can convert my non-ASCII chars >127 to UTF16? Use mapping?

Code:

UITextView* MyTextView;//assume this exists

unsigned char array1[] = {130,150,250};

unsigned char *array2 = malloc(4);

MyTextView.text = [NSString stringWithCString:array1 encoding: NSUTF16StringEncoding];
[MyTextView.text getCString:array2 length:MyTextView.text encoding:NSUTF8StringEncoding];

As result values of array1 and array2 differs.

Please help to understand and convert my chars >127 to UTF16.

Vetal
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  • What characters do 130, 150, 250 represent? In other words, which encoding or character set is used for the non-ASCII bytes? Without that information, it is impossible to answer your question properly. – Martin R Sep 18 '13 at 20:37
  • For example, 130 is hex 0x82, but the Unicode U+0082 is "BREAK PERMITTED HERE", which is a control character. - So just displaying arbitrary bytes does not make sense without any encoding information. – Martin R Sep 18 '13 at 20:56
  • Martin R, I just use array1 to hold values, it doesnt matter forme what charactters this values represent. Values are one-byte and I want to store them on the screen in the way that later i can read them back and receive 130 150 250in one byte each. For example i can store 130 as 127 in first byte and the remainder 3 in second byte.then display it in uitextview using utf16encod. After that read back to array2 using utf16encod (first byte 127 and second3) and just sum them and store in one-byte char.with value 130.?what do you think about ths? My algorith works with one byte values so need them – Vetal Sep 19 '13 at 08:16

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