4.9 Skipping Objects in the List: Example

  /* itrskip.c 
     Example of NDS 8 Iterator NWDSItrSkip function 
     . 
  */ 
   
  #include <stdio.h> 
  #include <stdlib.h> 
  #include <nwnet.h> 
  #include <nwcalls.h> 
   
  void main(int argc, char *argv[]) 
  { 
     NWDSContextHandle context =
         (NWDSContextHandle)ERR_CONTEXT_CREATION; 
     nstr8         strAbbreviatedName[MAX_DN_CHARS+1]; 
     NWDSCCODE     ccode; 
     nuint32       flags; 
     nuint32       iter=0; 
     nint32        iterHandle = -1; 
     nuint32       timeout = 0;   /* Timeout=0 means no time limit. */
     nint32        numToSkip = 1; 
     nint32        actual; 
   
  /* Check arguments */ 
     if(argc < 2) 
     { 
        printf("\nUsage:    itrskip  <base object>  <+/-skip count>\n"); 
        printf("\nExample:  itrskip  myou.myorg  -100\n"); 
        exit(1); 
     } 
   
     if (argc >= 3) 
        sscanf(argv[2], "%d", &numToSkip); 
   
     /* Initialize NWCalls and unicode tables */ 
     ccode = NWCallsInit(NULL,NULL); 
        if(ccode) exit(1); 
   
     /* Create NDS Context */ 
     ccode = NWDSCreateContextHandle(&context); 
     if(ccode) exit(1); 
   
     /* Set flags to get object names in typeless format. */ 
     NWDSGetContext(context, DCK_FLAGS, &flags); 
     flags |= DCV_TYPELESS_NAMES; 
     NWDSSetContext(context, DCK_FLAGS, &flags); 
   
     printf("itrskip:   Sample program for NWDSItrCount\n"); 
     printf("Container:    %s\n", argv[1]); 
     printf("Number of objects to skip:  %d\n\n", numToSkip); 
   
     /* Convert the directory name (passed in as first arg) to its 
        shortest form relative to the name context */ 
     ccode = NWDSAbbreviateName(context, argv[1], strAbbreviatedName); 
     if(ccode) goto error; 
   
     /* ———— Create the Iterator ————- */ 
   
     ccode = NWDSItrCreateList( 
                   context,              /* context for this search */ 
                   strAbbreviatedName,   /* container to search     */ 
                   NULL,                 /* class name filter       */ 
                   NULL,                 /* subordinate name filter */ 
                   DS_ITR_ANY_SERVER,    /* scalability requirement */ 
                   timeout,              /* 0 = no timeout          */ 
                   &iter);               /* returned Iterator ptr   */ 
     if (ccode) 
        goto error; 
   
   
     printf("Skipping %d objects...\n", numToSkip); 
     ccode = NWDSItrSkip(iter, numToSkip, timeout, &actual); 
     if (ccode == 0) 
        printf("Actual number of objects skipped = %d\n", actual); 
     else if (ccode == ERR_EOF_HIT) 
        printf("You tried to skip forward when Iterator was already 
                at EOF.\n"); 
     else if (ccode == ERR_BOF_HIT) 
        printf("You tried to skip backward when Iterator was already 
                at top.\n"); 
   
  /* Clean up, normal or error termination. */ 
  error: 
     printf("\n\nccode = %d.",ccode); 
     if (iter) 
        NWDSItrDestroy(iter);      /* Destroy the Iterator when done. */ 
     NWDSFreeContext(context); 
  }