RE: Rreadl - finding last active RRN in a file

Try or-ing your mask with __DATA_ONLY:
  fb = _Rreadl(forward,NULL,0,__NO_LOCK | __DATA_ONLY); 

Idea being that perhaps your last record is deleted record.  The above mask
should take care of that.

Also, in your verification code you could do:
    printf("RRN: %d. \n",forward->riofb.rrn);

but what you have already should work also.

Let us know how it goes.

Elvis

-----Original Message-----
From: c400-l-bounces@xxxxxxxxxxxx [mailto:c400-l-bounces@xxxxxxxxxxxx] On
Behalf Of David C. Shea
Sent: Thursday, September 30, 2004 4:11 PM
To: C programming iSeries / AS400
Subject: [C400-L] Rreadl - finding last active RRN in a file

I have been playing with Rreadl lately.  Bear in mind that I'm not a C
programmer...  RPG, yes, but not C.  But... I can cut and paste pretty well,
and I can figure things out if I see enough examples.  It's still pretty
much Greek to me, but it's starting to sink in.
 
According to the documentation I've seen, Rreadl is supposed to find the
last active record in a file member.  When it does this, it is supposed to
return the RRN of the record found amongst other things.
 
I have figured out how to execute this program, and it is, in fact, finding
the last record in the file.  I can get the buffer of the record to confirm
that it is, in fact, the right record.  I can get the buffer length from
RIOFB_T, and that is correct.  So, it appears that RIOFB_T is getting
populated with some stuff.  But... I'm not seeing anything in the rrn field
in RIOFB_T.  For some reason it's always coming back zero.  I have tried
printing the value with various flavors of field definitions, but that's not
helping either.
 
So... either I'm doing something wrong in my program, or I'm reading the
docs wrong and Rreadl does not, in fact, return the RRN of the record that
it found.
 
Can anyone tell me what I'm doing wrong?  The last active record in the file
is at RRN 30.
 
Here's the code I'm running:
 
#include <limits.h>

#include <stdlib.h>

#include <string.h>

#include <stdio.h>

#include <recio.h>

#include <xxfdbk.h>

 

static _RFILE *forward;

static char open_fwd_optionsÝ100¨ =

      "rr+ blkrcd=n riofb=n arrseq=y";

 

int main(int argc, char * argvݨ)

{

/*_RIOFB_T  * riofb_fwd;        */

  _RIOFB_T  * fb;

  _XXOPFB_T * opnfb;

  char * file_name;

 void ** p;

 int i,

     j;

 

 if (argc > 1)

 {

   file_name = argvÝ1¨; /* first parm is the file name */

 }

 else

 {

   printf("Enter file name in format LIB/FILE(MEMBER): \n");

   gets(file_name);

 }

 

 /* open the file the first time to get basic information */

 if ((forward = _Ropen(file_name,open_fwd_options)) == NULL)

 {

   printf("ERROR - file %s not found. \n",file_name);

   exit(EXIT_FAILURE);

 }

                                                                       
  opnfb = _Ropnfbk(forward);                                           
                                                                       
  /* position to just after last data record in the file */            
  fb = _Rreadl(forward,NULL,0,__NO_LOCK);                              
    printf("RRN: %d. \n",fb->rrn);                                     
    printf("RRN: %dl . \n",fb->rrn);                                   
    printf("RRN: %UL . \n",fb->rrn);                                   
    printf("RRN: %d . \n",fb->rrn);                                    
  _Rclose(forward);                                                    
  exit(EXIT_SUCCESS);                                                  
}                                                                      
 
 
and here's the output I'm getting:
 
RRN: 0.                                
RRN: 0l .                              
RRN: L .                               
RRN: 0 .                               
Press ENTER to end terminal session.   
 
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