convert help

convert help

• Greg Dillon

  If I were you, I wouldn't convert from bytes to string and back, just use bytes.  Conversion of binary data with a particular encoding and back does not always work.  Each encoding does not support all byte values (0-255) and may get translated into a "glyph".

  But, if you don't care about that:

  // load the bytes byte[] bytes = { 65, 66, 66, 68, 69 }; // convert to string String s = System.Text.Encoding.ASCII.GetString(bytes); // modify the string s = s.Substring(0, 2) + 'C' + s.Substring(3,2); // convert back to bytes bytes = System.Text.Encoding.ASCII.GetBytes(s);

  Replace ASCII with another encoding if you wish.

  
  
  

• ZeeMan48

  A question: but if a char corresponds to 2 byte, the byte array must be double size char array

  It doen's work...i have a % = 25hex and Buffer.BlockCopy transform it in 2 byte: 37 (correct) and 0 ...

  HELP

  
  
  

• clivees

  After a quick check, it seems the Windows-1252 code page seems to convert all 255 bytes to/from Unicode without loss. My example revised:

  // load the bytes byte[] bytes = { 65, 66, 66, 68, 69 }; // convert to string System.Text.Encoding encoding = System.Text.Encoding.GetEncoding(1252); String s = encoding.GetString(bytes); // modify the string s = s.Substring(0, 2) + 'C' + s.Substring(3, 2); // convert back to bytes bytes = encoding.GetBytes(s);

  
  
  

• Fish-Dude

  Yes, it's a "magic" number. I don't like to use them, but there's no constants defined to make them more meaningful, as far as I can tell.

  1252 is a codepage ID for the Western European (Windows) codepage, also known as ISO-8859-1. A codepage is basically a lookup table for supported characters.

  
  
  

• arch82

  I used ASCII strictly as an example, I could have chosen a better Encoding class.

  ASCIIEncoding.Default should provide a good Encoding object to work with; but it will depend upon the current Window settings...

  
  
  

• stevelam

  A char in .NET is 2 bytes. A string is essentially an array of chars. If you're reading binary data you should always use byte, not char/string; your data will most likely get mangled.
  
  

• Balaam

  Are you looking for something like-

  string s = "Karthik";

  char[] chars = s.ToCharArray();

  byte[] bytes = new byte[chars.Length];

  Buffer.BlockCopy(chars, 0, bytes, 0, chars.Length);

  Not sure if this helps,but still...

  
  

• Konstantin Gonikman

  Unfortunately the ASCII will strictly truncate to 7bits, so any characters above 127 becomes ' '. You might get lucky by using the Default encoding which will adopt your default codepage. It's obsolete and dangerous, in view of internationalization and compatibility issues, but it's probably your best bet when handling files that were encoded without Unicode, or UTF's.

  This will allow you to get strings out of your byte buffers, manipulate them and then go back to bytes, with the nice side effect that the number of characters will always match the number of bytes.

  byte [] toBytes = ASCIIEncoding.Default.GetBytes ("a ");
  string backToString = ASCIIEncoding.Default.GetString (toBytes);

  HTH
  --mc

  
  

• glorfindel_i510

  i start from a filestream...then save it in byte array...convert in string (to replace some char)...then continue...
  
  

• vice

  Checking last solution... but i can't understand 1252...explain better

  What's the difference with the previous solution

  
  
  
• convert help