Generate and Write unicode characters to file
The genearted characters looks OK (up to x00FF) but after writing them to file those characters and their values are different. Also the characters after 0x00FF are not coming proper.
Any idea?
Solved!
Go to Solution.
You should probably give this page a thorough read if you are intending on using Unicode in your application. Here is a relevant excerpt:
ASCII technically only defines a 7-bit value and can accordingly represent 128 different characters including control characters such as newline (0x0A) and carriage return (0x0D). However ASCII characters in most applications including LabVIEW are stored as 8-bit values which can represent 256 different characters. The additional 128 characters in this extended ASCII range are defined by the operating system code page aka "Language for non-Unicode Programs". For example, on a Western system, Windows defaults to the character set defined by the Windows-1252 code page. Windows-1252 is an extension of another commonly used encoding called ISO-8859-1.
Windows-1252 gives you characters up to 0xFF (ÿ) but not anything greater than 8-bits (e.g. no 0x0100). By default LabVIEW only supports these 8-bit characters uses multi-byte character strings--interpretation is based on the current code page selected in the operating system. You may turn on Unicode through the instructions provided in my first link (it is unsupported and can be a bit buggy on occasion...) to obtain multibyte unicode character support to allow for multibyte characters not in the OS code page.
Unicode has multiple encodings, and the raw bits for a given character depend on the encoding used. LabVIEW's limited unicode support appears to use UTF-16LE (little-endian) encoding for anything displayed within the UI. So to get the characters to show up on the UI, you must enable unicode (instructions shown in my first link) and write the proper UTF-16LE codes:
UTF-8 is more common and thus easier to work with outside of LabVIEW (e.g. my version of Notepad++ evidently does not support UTF-16LE). I usually end up using UTF-8 encoded strings for files and converting them to UTF-16LE for display in LabVIEW.
The unicode library in my first link has the necessary subVIs for converting between UTF-8 and "Unicode" (i.e. UTF-16LE).
Best Regards,
John Passiak
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SET SERVEROUTPUT ON;
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Filename varchar2(1000); -- nvarchar2(1000);
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exception
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Error: ORA-29283: invalid file operation
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anonymous block completed
Opening file [test-s.txt]
Closing file
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- look at this thread -> [ http://stackoverflow.com/questions/480849/windows-codepage-interactions-with-standard-c-c-filenames]
So if your code page is a Windows ANSI 1252, these characters are treated as:
ś -> c5 is "Å" , 9b is "›" --> Å›
ć -> c4 -> Ä, 87 -> ‡ --> ć
so instead of a 'teść', Windows converts it to 'teŘć' ;)
Here is a table of codes of CP-1252 -> [http://en.wikipedia.org/wiki/Windows-1252]
CP 1525 doesn't support polish characters, the only Windows ANSII code page that supports them is CP 1250
I've changed the system code page to 1250 on the server side, and this have worked fine:
declare
fh UTL_FILE.FILE_TYPE;
strbuffer NVARCHAR2(1000);
begin
fh := UTL_FILE.FOPEN_NCHAR( 'DIR_USER_FILES', CONVERT('teść.txt', 'EE8MSWIN1250' ), 'w' );
utl_file.put_line_nchar( fh, 'chrząszcz brzmi w trzcinie');
utl_file.put_line_nchar( fh, 'teść żócał mięśńęm');
utl_file.fclose( fh );
fh := UTL_FILE.FOPEN_NCHAR( 'DIR_USER_FILES', CONVERT('teść.txt', 'EE8MSWIN1250' ), 'r' );
LOOP
BEGIN
utl_file.get_line_nchar( fh, strbuffer );
dbms_output.put_line( strbuffer );
EXCEPTION
WHEN OTHERS THEN
EXIT;
END;
END LOOP;
utl_file.fclose( fh );
END;
/I've leaved untouched the users locale as "English (United States), only *the system locale* has been changed to "Polish"
- there are two different locales, look at this thread for details [http://mihai-nita.net/2005/06/11/setting-the-user-and-system-locales/]
If you change the server's system locale, this will affect all other non-unicode programs running on this server,
so something other may stop running properly.
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