SDDS_GetColumnInformation

• name:
  SDDS_GetColumnInformation
• description:
  Returns information about a specified column. This routine is the preferred alternative to SDDS_GetColumnDefinition.
• synopsis: #include "SDDS.h"
  long SDDS_GetColumnInformation(SDDS_TABLE *SDDS_table, char *field_name, void *memory, long mode, name-or-index)
• arguments:
  • 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_DOUBLE, SDDS_FLOAT, SDDS_LONG, SDDS_SHORT, SDDS_CHARACTER, or SDDS_STRING.
  
  On failure, returns zero and records an error message.
• see also:
  • SDDS_GetColumnDefinition
  • SDDS_GetColumnIndex
  • SDDS_NumberOfErrors
  • SDDS_PrintErrors
  • SDDS_VerifyColumnExists