Problem:
- Product Name: Visibroker
- Product Version: 5.x and above
- Product Component: Unicode
- Platform: All
Do we need to change IDL file so as to use wstring instead of string type?
Is there some ways to achieve support for Unicode in string type?
Resolution:
Visibroker supports Unicode according to OMG Language mapping specification (C & IDLtoJava).
VisiBroker default native codeset for char is ISO 8859_1, and for wchar and wstring is UTF-16.
All codesets which are compatible with these 2 codesets are also supported.
To be more precise, ASCII is supported for char/strings & UCS-2 Level 1 for wchar/wstrings.
Conversion of codesets is not supported for VBC .
But VBJ supports UTF-8 as the conversion codesets for char.
================================
A brief introduction on codesets:
ISO 8859_1(Latin1 codeset): Extends ASCII. 8-bit encoding includes most western European languages.
-----------UCS-------------
UCS-2 code set: 2 bytes encoding per character
UCS-4 code set: 4 bytes encoding per character
---------- Unicode ---------
UTF-16: 2 bytes encoding for commonly used characters, 4 bytes encoding for others. Compatible with UCS-2.
UTF-32: 4 bytes encoding per character. Compatible with UCS-4.
UTF-8: variable length of 1 to 4 bytes encoding. Compatible with ASCII.
Unicode characters corresponding to the familiar ASCII set have the same byte values as ASCII.
For C , string is mapped to char* and wstring is mapped to wchar*, and refer to supported codesets (see above) for char/string and wchar/wstring, UTF-16 (Unicode/16 bits) is not for char (8 bits) but for wchar (16 bits). As the charset of UCS-2 Level 1 is compatible with UTF-16, UCS-2 Level 1 is also supported for both VisiBroker for Java and VisiBroker for C .
Please also take note that in 6.0, UTF-8 is not supported in VBC60 but is in VBJ60.
From VB 8.5 onwards, the native code set for char can be changed to UTF-8 by setting the property "vbroker.orb.ncsc=UTF8". Refer to Borland VisiBroker 8.5 Release Notes.
#VisiBroker
#UTF8
#Security
#unicode
#codeset
