SDDS_table: Address of the SDDS_TABLE structure for the data set.
field_name: A NULL terminated string giving the name of the field that information
is requested for. These field names are identical to the names used in the namelist
commands.
memory: The address in which to place the information. Should have type data-type*
in the user’s program, where data-type is the data type of the information. Note that for
STRING information, data-type is char *. If memory is NULL, the existence and type
of the information will be verified; the type will be returned as usual.
mode: One of the following constants (defined in SDDS.h):
SDDS_GET_BY_NAME - Indicates that the next argument is a NULL-terminated
character string containing the name of the column for which information is desired.
SDDS_GET_BY_INDEX - Indicates that the next argument is a non-negative
integer giving the index of the column for which information is desired. This index
is obtained from SDDS_DefineColumn or SDDS_GetColumnIndex.
return value: On success, returns the SDDS data type of the information. This is one of the following
constants (defined in SDDS.h): SDDS_LONGDOUBLE, SDDS_DOUBLE, SDDS_FLOAT,
SDDS_LONG, SDDS_ULONG, SDDS_SHORT, SDDS_USHORT, SDDS_CHARACTER, or
SDDS_STRING.
On failure, returns zero and records an error message.