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Resolved How can I identify if a string contains UTF-8 characters or not?

  1. How-to
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  1. Frank Zettanucci
    Frank Zettanucci
  2. PowerBuilder
  3. Tuesday, 2 May 2023 14:19 PM UTC

Is anyone aware of a reliable PowerBuilder Powerscript way to identify if a string contains UTF-8 characters or not ?

 

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Responses (3)
William Hong
William Hong Accepted Answer Pending Moderation
  1. Thursday, 4 May 2023 06:25 AM UTC
  2. PowerBuilder
  3. # 1

A string is always composed of Unicode characters encoded in UTF-16

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Chris Pollach @Appeon
Chris Pollach @Appeon Accepted Answer Pending Moderation
  1. Tuesday, 2 May 2023 20:19 PM UTC
  2. PowerBuilder
  3. # 2

Hi Frank;

  I have not tried this approach personally but, this might work (in theory) ...

String ls_data, ls_data_ansi

ls_data = "<Your Data>"
ls_data_ansi = String ( Blob (ls_data, EncodingANSI! ))
IF ls_data = ls_data_ansi  THEN
   MessageBox ("ANSI", "Data Found!")
ELSE
   MessageBox ("Unicode", "Data Found!")
END IF

HTH

Regards ... Chris

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Benjamin Gaesslein
  1. Benjamin Gaesslein
  2. Wednesday, 3 May 2023 06:54 AM UTC
This will not compile, String( x, Encoding...! ) is for blobs, not strings. You must first convert ls_data to a blob like so:

ls_data_ansi = String ( Blob(ls_data, EncodingUTF8!), EncodingANSI! )



If the resulting string matches the original it is indeed safe to assume that it contains only ASCII characters.
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Francisco Martinez @Appeon
Francisco Martinez @Appeon Accepted Answer Pending Moderation
  1. Tuesday, 2 May 2023 14:50 PM UTC
  2. PowerBuilder
  3. # 3

Hi Frank,

A string itself is nothing more than a sequence of bytes (in theory). These bytes have no particular meaning until you decide to interpret them under a particular schema (ASCII, UTF8, UTF16, etc). As such, based on my (very) limited understanding, a sequence of bytes can very well be a valid ASCII or UTF8 string depending on which schema you choose to interpret the byte sequence with. Whether or not this string will make sense, is another very different issue.

I would love to be proven wrong, however.

Regards,
Francisco

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