DtMmdbDlpGetPrevSectionId(library call) 								   DtMmdbDlpGetPrevSectionId(library call)

NAME

       DtMmdbDlpGetPrevSectionId -- obtains the object identifier of the previous section

SYNOPSIS

       #include <DtMmdb.h>
       DtMmdbHandle* DtMmdbDlpGetPrevSectionId(
       DtMmdbInfoRequest* request);

DESCRIPTION

       The DtMmdbDlpGetPrevSectionId function returns the object identifier of the previous section. You can use this function to traverse the TOC
       hierarchy in a depth-first fashion.

       Use the DtMmdbFreeHandleList function to release the memory when the object identifier is no longer needed. Table lookup is involved.

ARGUMENTS

       request	 Specifies the bookcase in the bookcase descriptor field, as well as the id of the current section in the primary_oid field.

RETURN VALUE

       If DtMmdbDlpGetPrevSectionId completes successfully, it returns a pointer to the object identifier for the previous section or DtMmdbGroun-
       dId, if there is no previous section.  If it fails, it returns a NULL pointer.

EXAMPLE

       The following shows how a DtMmdbDlpGetPrevSectionId call might be coded.

       DtMmdbInfoRequest request;
       /* fill the request here */
       DtMmdbHandle* x = DtMmdbDlpGetPrevSectionId(&request);
       if ( x == DtMMdbGroundId) {
	  /* no previous section */
       } else
	 {
	  if (x == 0) {
	    /* bad request */
	 }
	 else
	 { /* make use of x */
	 }

SEE ALSO

       DtMmdbDlpGetNextSectionId(3)

													   DtMmdbDlpGetPrevSectionId(library call)