IBM IDS ENTRP E / 5724L2304 / B15 - IDS 11.50

The CDC API sample program which is included in the CDC API 
Programmer's Guide works with an obsolete identifier for 
'PacketScheme' member of CDC record common header ('LGRC'): 
 
     mint 
    process_databuf(char *databuf, int bytesread) 
   { 
      int  logrectype; 
     char recsymb[17], recdesc[128]; 
 
   if (reminderBytes <= 0) 
{ 
/* Get the common header information from the CDC packet*/ 
cur_log_header.ch_size_hdr  = ldlong(databuf); 
cur_log_header.ch_size_payload = ldlong(databuf+4); 
memcpy((char*)(&cur_log_header.ch_payload_type), 
(databuf+8),4); 
 
/* Check what we got is a correct CDC packet */ 
if (memcmp((char*)&(cur_log_header.ch_payload_type), "LGRC", 
4)!= 0) 
  { 
  fprintf(stderr, "Unknow packet type.\n"); 
 return -1; 
       } 
.....            } 
 
 
However, the correct value of this identifier is 66 (0x42; 
CDC_PKTSCHEME_LRECBINARY), so the sample program ends 
prematurely with "Unknow packet type" error message. The sample 
program should be modified to use the correct value, for 
example: 
 
1. define the CDC_PKTSCHEME_LRECBINARY somewhere at the 
beginning: 
#define CDC_PKTSCHEME_LRECBINARY ((int4) 66) 
 
2. modify the process_databuf() function to: 
 
mint 
process_databuf(char *databuf, int bytesread) 
{ 
   int logrectype, size; 
  char recsymb[17], recdesc[128]; 
 
if (reminderBytes <= 0)          { 
           /* 
Get the common header information from the CDC packet*/ 
cur_log_header.ch_size_hdr  = ldlong(databuf); 
cur_log_header.ch_size_payload = ldlong(databuf+4); 
cur_log_header.ch_payload_type = ldlong(databuf+8); 
 
/* Check what we got is a correct CDC packet */ 
      if (cur_log_header.ch_payload_type != 
CDC_PKTSCHEME_LRECBINARY) 
       { 
fprintf(stderr, "Unknown packet type.\n"); 
      return -1; 
     } 
.....            }

**************************************************************** 
* USERS AFFECTED:                                              * 
* All users of documentation for IDS v11.50.xC4 and earlier.   * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* The identifier for the Packet Scheme member of the CDC       * 
* record common header is incorrect. This error occurs in the  * 
* Change Data Capture sample program of the Change Data        * 
* Capture API Programmer's Guide.                              * 
*                                                              * 
* The incorrect information in the sample program is:          * 
*                                                              * 
* mint                                                         * 
* process_databuf(char *databuf, int bytesread)                * 
* {                                                            * 
*     int  logrectype;                                         * 
*     char recsymb[17], recdesc[128];                          * 
*                                                              * 
*     if (reminderBytes <= 0)                                  * 
*  {                                                           * 
*  /* Get the common header information from the CDC packet*/  * 
*  cur_log_header.ch_size_hdr  = ldlong(databuf);              * 
*  cur_log_header.ch_size_payload  = ldlong(databuf+4);        * 
*  memcpy((char*)(&cur_log_header.ch_payload_type),            * 
* (databuf+8),4);                                              * 
*                                                              * 
*  /* Check what we got is a correct CDC packet */             * 
*  if (memcmp((char*)&(cur_log_header.ch_payload_type),        * 
* "LGRC", 4) != 0)                                             * 
*         {                                                    * 
*   fprintf(stderr, "Unknow packet type.\n");                  * 
*          return -1;                                          * 
*          }                                                   * 
*    .....                                                     * 
* }                                                            * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to IDS v11.50.xC5 documentation and above.           * 
****************************************************************

Modify the CDC API sample program as described in Error 
Description.

To correct the sample program, do the following: 
 
1. Define the CDC_PKTSCHEME_LRECBINARY early in the sample 
program: 
 
       #define CDC_PKTSCHEME_LRECBINARY ((int4) 66) 
 
2. Modify the process_databuf() function to the following: 
 
mint 
process_databuf(char *databuf, int bytesread) 
{ 
    int  logrectype, size; 
    char recsymb[17], recdesc[128]; 
 
    if (reminderBytes <= 0) 
 { 
 /* Get the common header information from the CDC 
packet*/ 
 cur_log_header.ch_size_hdr = ldlong(databuf); 
 cur_log_header.ch_size_payload = ldlong(databuf+4); 
 cur_log_header.ch_payload_type = ldlong(databuf+8); 
 
 /* Check what we got is a correct CDC packet */ 
 if (cur_log_header.ch_payload_type != 
CDC_PKTSCHEME_LRECBINARY) 
  { 
  fprintf(stderr, "Unknown packet type.\n"); 
  return -1; 
  } 
   ..... 
}

not known / see Local fix

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

08.06.2009
19.01.2010
19.01.2010