Informix CDC API errors - informix

Question

I am getting errors while trying to run Informix CDC api.
I copied the code https://www.ibm.com/support/knowledgecenter/SSGU8G_11.50.0/com.ibm.cdc.doc/ids_cdc_060.htm into cdcapi_INFORMIX.ec
Ran as informix user login, I am getting error CDC_ERRORCODE = CDC_E_APIVERS
I got few warnings while compiling the program but it compiled into a program CDCEXE. But doent seem to work. Could anyone provide me few pointers
check_version csdk
Currently installed version: 3.50.FC5
ifx_getversion dmi
IBM/Informix-Client SDK Version 3.50.FC5
ifx_getversion esql
IBM/Informix-Client SDK Version 3.50.FC5
IBM/Informix EMBEDDED SQL for C Version 3.50.FC5
Copyright (C) 1991-2009 IBM
esql -g -static -o CDCEXE cdcapi_INFORMIX.ec /opt/inf/sdk/lib/dmi/libdmi.a "cdcapi_INFORMIX.ec", line 492:
warning #2223-D: function "ldlong" declared
implicitly
c_int8.data[0] = ldlong(databuf+INT8_LO_OFFSET);
^
"cdcapi_INFORMIX.ec", line 558: warning #2223-D: function "ldbigint"
declared
implicitly
ldbigintx(&c_bigint, databuf);
^
"cdcapi_INFORMIX.ec", line 587: warning #2223-D: function "lddecimal"
declared
implicitly
lddecimal(databuf, coldesc.colobj[col].colsize, &c_decimal);
^
"cdcapi_INFORMIX.ec", line 687: warning #2223-D: function "rtypsize"
declared
implicitly
colsize = rtypsize(sqlda->sqlvar[col].sqltype,
^
"cdcapi_INFORMIX.ec", line 747: warning #2223-D: function "ldlong"
declared
implicitly
lsn_hi = ldlong(databuf + TRUNCATE_LSN_HI_OFFSET);
^
"cdcapi_INFORMIX.ec", line 778: warning #2223-D: function "ldlong"
declared
implicitly
tabid = ldlong(databuf+TABSCHEMA_USERDATA_OFFSET);
^
"cdcapi_INFORMIX.ec", line 873: warning #2223-D: function "ldlong"
declared
implicitly
lsn_hi = ldlong(databuf + TXN_LSN_HI_OFFSET);
^
"cdcapi_INFORMIX.ec", line 908: warning #2223-D: function "ldlong"
declared
implicitly
lsn_hi = ldlong(databuf + DISCARD_LSN_HI_OFFSET);
^
"cdcapi_INFORMIX.ec", line 947: warning #2223-D: function "ldlong"
declared
implicitly
lsn_hi = ldlong(databuf + IUD_LSN_HI_OFFSET);
^
"cdcapi_INFORMIX.ec", line 1019: warning #2223-D: function "ldlong"
declared
implicitly
cur_log_header.ch_size_hdr = ldlong(a_recordbuf);
^
"cdcapi_INFORMIX.ec", line 1342: warning #2549-D: variable "recptr" is
used
before its value is set
memcpy(databuf, recptr, bytes_left_over_in_previous_buf);
^
"cdcapi_INFORMIX.ec", line 1387: warning #2223-D: function "ldlong"
declared
implicitly
hdrsize = ldlong(recptr);
Ran the program as
./CDCEXE -D db1 -T "bill.t1" -C "a,b" -T t2 -C "a,c" INFORMIXSERVER [server1] Connected to syscdcv1#server1 CDC_OPENSESS for server1
server1 with Timeout 300 Max recs per read 1
CDC API 'cdc_opensess' Failed at cdcapi_INFORMIX.ec:1277.
CDCAPI_RETVAL = -83702, CDC_ERRORCODE = CDC_E_APIVERS CDC Error Description is
The requested CDC API behavior version is not valid or is unsupported.
Total buffers read: 0 Total records extracted: 0 Average recs per
buffer: 0.000000

Answer 1

The CDC error -83702 refers to a mismatch in the API version. Since your version of ESQL/C is 3.50.FC5 I presume your Informix server version is 11.50.FC5. This uses an earlier version (1.0) of the CDC API whilst the example code from the IBM Knowledge Center uses API version 1.1.
This problem can be resolved by upgrading the Informix server to 11.50.FC6 or later. The latest 11.50 version is 11.50.FC9W3.