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Syntax: int PXFldBlank(RECORDHANDLE recHandle, FIELDHANDLE fldHandle,
                       int *BlankPtr)

Args: recHandle  - record buffer handle
      fldHandle  - field handle of field to be tested
      *Blankptr  - on success:  1 (TRUE) if field is blank
                                0 (FALSE) if not blank
                                undefined on error

Returns: PXSUCCESS (0) or error number

Synopsis: Determines if field pointed to by fldHandle is blank.  Note
   that this is not the same as 0 or spaces. In fact, most numeric fields
   that are "UNKNOWN" have the high order bit set to 1.

   If the specified field is a blob, PXFldBlank will return true only if
   the blob has a length of zero.