Converting bytes to Strings

dermot

Hi,

Does anyone know how to convert bytes/words/longs to strings and strings to bytes/words/longs. Is there an object pre-written. I cant find any.

Bobb Fwed

Not quite sure what you mean, but strings are bytes. In SPIN, a string is an array of bytes that is zero terminated.

If you want to make a string of bytes you could (in a DAT section), do this:
byte string1 "I"," ","a","m"," ","h","e","r","e",0 'notice each letter is handled as a byte
or more simply:
byte string1 "I am here",0
these two are handled the same way. Both can be handled as bytes or as a string.

I have an object (in my signature) that does string manipulation, if that is what you are looking for.

EDIT: Possibly you are looking to convert numeric values to strings? Then look for the "Simple_Numbers" object in the OBEX (this one, I think...it has a different name), but you already have it, because it came with the Propeller Tool.

dermot

Thanks Bobb,

Sorry for confusion I was indeed trying to convert numeric values to strings

Duane Degn

Look at the "dec" method in FullDuplexSerial.

It shows how to convert a value to ASCII characters.

Duane

MagIO2

Several objects contain conversion functions. For example the FullDuplexSerial, I think TV Text/VGA drivers also allows to print numbers. Some LCD drivers can do the conversion. These usually are called .hex, .bin and .dec and convert from number to string.

I think there is also a string object somewhere which can also convert from string to number.

The ConfigReader object in the tools section also converts from string to number.

Duane Degn

I'd like to add one more method to MagIO2's list.

The Parallax Serial Terminal (PST) object has a very nice little method called StrToBase. Here's the method:

PRI StrToBase(stringptr, base) : value | chr, index
{Converts a zero terminated string representation of a number to a value in the designated base.
Ignores all non-digit characters (except negative (-) when base is decimal (10)).}
  value := index := 0
  repeat until ((chr := byte[stringptr][index++]) == 0)
    chr := -15 + --chr & %11011111 + 39*(chr > 56)                              'Make "0"-"9","A"-"F","a"-"f" be 0 - 15, others out of range     
    if (chr > -1) and (chr < base)                                              'Accumulate valid values into result; ignore others
      value := value * base + chr                                                  
  if (base == 10) and (byte[stringptr] == "-")                                  'If decimal, address negative sign; ignore otherwise
    value := - value
       

To bad it's a private method. I think it would be more useful if it had been a public method.

I just recently discovered this useful method; I thought I'd let others know about it.

Duane

tonyp12

dermot wrote: »

Sorry for confusion I was indeed trying to convert numeric values to strings

Really simple if you are Ok with a HEX representation of the value.
each 4 bits will be the 0 to F, so just add 48 to it and if that result is higher than 57 add another 8 to it.

Dec is a little harder, but if you know your value will always be between 0-99 (two digits) then some shortcuts could be implemented.