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Status Delivered
Workspace Informix
Components Informix Client Products
Created by Guest
Created on Feb 12, 2021

RELATED IDEAS

Informix ESQL/C ifx_var_getdata() should do charset conversion when binding with CLVCHARPTRTYPE

Environment: Linux Debian 10.7 or Windows 10 Informix server: IDS-14.10.FC5 Informix client: CSDK 4.50.FC5

With the DB in UTF-8 (DB_LOCALE = en_us.utf8) and client app in another character encoding (CLIENT_LOCALE=en_us.8859-15):

When fetching an LVARCHAR column, and binding with ifx_sqlvar_t sqltype=CLVCHARPTRTYPE, after the fetch we want to get the character string with ifx_var_getdata().

But it appears that the sequence of bytes returned by the ifx_var_getdata() function is pure UTF-8, and is not converted to ISO-8859-15 ...

Documentation says that this function returns ASCII data ... we assume that no conversion is done at all and it returns just the UTF-8 byte sequence.

The string should be converted to the charset of CLIENT_LOCALE, just as when binding with CVCHARTYPE and a self-allocated buffer. But that solution is not acceptable for LVARCHAR because we would need to allocate large buffers to cover the max LVARCHAR size!

https://informix.hcldoc.com/14.10/help/index.jsp?topic=%2Fcom.ibm.esqlc.doc%2Fids_esqlc_0007.htm

"..The lvarchar pointer type is not equivalent to a C-language char pointer. Informix® ESQL/C maintains its own internal representation for the lvarchar pointer type. This representation is identical to the representation of a var binary host variable, except that it supports ASCII data as opposed to binary data..."

Needed by Date May 1, 2021
  • Guest
    Reply
    |     Aug 7, 2023

    Hello,

    I had a chance to install IDS 14.10.FC10 + CSDK 4.50.FC10 to test the charset conversion for CLVCHARPTRTYPE.

    Bad news: I get an error:

    SQL statement error number -23103.
    Code-set conversion function failed due to illegal sequence or invalid value.

    Happens when using DB_LOCALE=en_us.utf8 / CLIENT_LOCALE=en_us.8859-15

    We let the Informix client allocate the required memory for the fetch buffer : ifx_var_flag(&lvarchar, 1)

    Where can I provide an ESQL/C sample to reproduce?

    Is this the right place to report bugs?

    Seb


  • Admin
    Karen Qualley
    Reply
    |     Apr 3, 2023

    Delivered as part of 4.50.xC10 CSDK

    1 reply

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