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ANSI Characters in DB and Paradox

Using non-ASCII characters in
DBIII and Paradox
ANSI (8bit) - OEM (8bit) conversion
There is a certain problem of using national alphabets characters (Russian, German, French, Spanish etc.) in DBIII and Paradox databases. They use OEM coding instead of Windows ANSI ones, i.e text records exported from MS Access to DB3 format will be converted from ANSI to OEM. As far as characters 128-255 in OEM and ANSI coding tables occupy different positions you need to decode information after reading it by ToolBook application back to ANSI.

The easiest way to do this is use special function OemToAnsi() from KEYBOARD driver (DLL).

ScriptScript contains OemToAnsi(str) function for string conversion.

However there is another problem associated with KEYBOARD driver. Many API's string functions including mentioned above OemToAnsi() are language dependent. Algorithm of OemToAnsi and AnsiToOem conversion depends on Windows language settings. For example, German text being exported to db3 file from Russian Windows will be unreadable (in the non-ASCII part)  in German Windows.

This problem, actual for multilanguage products, could be solved with the ANSI-ASCII encoding/decoding algorithms, similar to the Internet BASE64 standard.

ANSI (8bit) - ASCII (7bit) conversion
  An example of such algorithm that converts each 3 ANSI (8bit) characters to 4 ASCII (7bit) printable characters with increasing the length of text string by 33% is presented here.

ScriptOpenScript ANSItoASCII() and ASCIItoANSI() functions.

 

VBAVBA (MS Access) ANSItoASCII() and ASCIItoANSI() functions.

ANSI (BINARY) - ASCII encoding/decoding
  To export text from MS Access with ANSI-ASCII encoding you can use a special query, converting database fields using VBA function ANSItoASCII(). By export ofthis query you'll get db file that can be transferred to any localized version of Windows. For the backward decoding of database in Toolbook use ASCIItoANSI() this time written in OpenScript.

Similar algorithms  of ASCII encoding can be used with binary data when the task is to convert data into the text format.

See also
  Other Data Conversion algorithms.

     
   

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