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VistaIOEncodeAttrValue(3)


NAME

   VistaIOEncodeAttrValue - encode an attribute value

SYNOPSIS

   VistaIOStringConst VistaIOEncodeAttrValue (dict, repn, value)
          VistaIODictEntry *dict;
          VistaIORepnKind repn;
          type value;

   where   type,   according   to   repn,   is  VistaIOBit,  VistaIOUByte,
   VistaIOSByte, VistaIOShort, VistaIOLong,  VistaIOFloat,  VistaIODouble,
   VistaIOBoolean, or VistaIOString.

ARGUMENTS

   dict      May  specify a dictionary to be used in translating the value
             supplied to a keyword that should be returned as the  encoded
             value, or it may be NULL

   repn      Specifies the representation of the value to be encoded.

   value     Specifies the value to be encoded.

DESCRIPTION

   VistaIOEncodeAttrValue  takes  a  value and an optional dictionary, and
   encodes the value as a character string  suitable  for  storage  in  an
   attribute list or output to a data file.

   With  the  dict argument you can provide a dictionary for mapping value
   to  a  keyword  that  will  be  returned  as  the  encoded  value  (see
   VistaIOdictionary(3)).  For  example,  if  you  pass a value of 1 and a
   dictionary that associates the value 1 with the keyword ubyte  (as  the
   dictionaryVistaIORepnDict   does),   then  the  string  ubyte  will  be
   returned. Dictionaries may be used  to  map  both  numeric  values  and
   strings  to  keywords.  If  you  supply  a  dictionary but value is not
   mentioned in that dictionary, then value itself will be  encoded  as  a
   string and returned.

RETURN VALUES

   If  successful,  VistaIOEncodeAttrValue  returns a string that is valid
   until   the    next    VistaIOEncodeAttrValue,    VistaIOSetAttr,    or
   VistaIOSetAttrValue  call. If, on the other hand, it fails because repn
   is not one of the representations supported, it returns NULL

SEE ALSO

   VistaIODecodeAttrValue(3), VistaIOSetAttr(3), VistaIOattribute(3),

DIAGNOSTICS

   ``Can't encode from repn.''
          The   repn   argument   is   not    one    of    VistaIOBitRepn,
          VistaIOUByteRepn, ..., VistaIOBooleanRepn, or VistaIOStringRepn.

AUTHOR

   Art Pope <pope@cs.ubc.ca>

   Adaption to vistaio: Gert Wollny <gw.fossdev@gmail.com>



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