4.8 Positioning the Iterator with Typedown: Example

  /* itrtypdn.c 
     Example of NDS 8 Iterator Typedown and GetCurrent functions. */ 
   
  #include <stdio.h> 
  #include <stdlib.h> 
  #include <nwnet.h> 
  #include <nwcalls.h> 
   
  #define BASECLASS  "User" 
   
  void main(int argc, char *argv[]) 
  { 
     NWDSContextHandle context =
           (NWDSContextHandle)ERR_CONTEXT_CREATION; 
     nstr8          strAbbreviatedName[MAX_DN_CHARS+1]; 
     pBuf_T         pb = NULL; 
     NWDSCCODE      ccode; 
     nuint32        flags; 
     nuint32        iter=0; 
     nint32         iterHandle = -1; 
     nstr8          objName[MAX_DN_CHARS+1]; 
     nuint32        objCount, attrCount; 
     Object_Info_T  objectInfo; 
   
  /* Check arguments */ 
     if(argc != 3) 
     { 
        printf("\nUsage:    itrtypdn  <base object>  <typedown string>"); 
        printf("\nExample:  itrtypdn  myou.myorg  d"); 
        exit(1); 
     } 
   
     /* 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("itrtypdn:   Sample program for NDS 8 Iterator List\n"); 
     printf("Container to list:    %s\n",   argv[1]); 
     printf("Typedown string:      %s\n",   argv[2]); 
   
     /* 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; 
   
     /* Allocate the output buffer.  */ 
     ccode = NWDSAllocBuf(MAX_MESSAGE_LEN, &pb); 
     if(ccode) goto error; 
   
     /* ———— Create the Iterator ————- 
        A list iterator is ordered first by Base Class, 
        then by RDN within a base class. 
     */ 
   
     ccode = NWDSItrCreateList( 
                   context,              /* context for this search */ 
                   strAbbreviatedName,   /* container to search     */ 
                   BASECLASS,            /* class name filter       */ 
                   NULL,                 /* subordinate name filter */ 
                   DS_ITR_ANY_SERVER,    /* scalability requirement */ 
                   0,                    /* no timeout              */ 
                   &iter);               /* returned Iterator ptr   */ 
     if (ccode) 
        goto error; 
   
   
     /* For a List Iterator the BaseClass,RDN index is used.  Typedown  
        on this index uses the RDN field.  The iterator should thus be
        restricted to a single baseclass. 
     */ 
     ccode = NWDSItrTypeDown(
                        iter,     /* Iterator Ptr */ 
                        NULL,     /* Reserved */ 
                        argv[2],  /* Typedown string. RDN value */ 
                           flags,    /* Context flags indicate Byte mode */ 
                        0);       /* Timeout */ 
     if (ccode) goto error; 
   
     /* Get the object name at the current position. */ 
     ccode = NWDSItrGetCurrent(iter, &iterHandle, pb); 
     if (ccode == ERR_EOF_HIT) 
        printf("\nNo objects in list were greater or equal to 
               typedown string.\n\ Iterator is positioned at EOF\n"); 
     if (ccode) goto error; 
   
   
     ccode = NWDSGetObjectCount (context,pb,&objCount); 
     if (ccode) goto error; 
   
     ccode = NWDSGetObjectName (context, 
                                pb, 
                                objName, 
                                &attrCount, 
                                &objectInfo); 
     if (ccode) goto error; 
   
     printf("\nTyped down to object:  %s\n", objName); 
   
   
   
  /* Clean up, normal or error termination. */ 
  error: 
     printf("\n\nccode = %d.",ccode); 
     if (iter) 
        NWDSItrDestroy(iter);      /* Destroy the Iterator when done. */ 
     if (pb) 
        NWDSFreeBuf(pb); 
     NWDSFreeContext(context); 
  }