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2008 Unidata NetCDF Workshop for Developers and Data Providers > User Defined Types in NetCDF-4

16.9 Enum Example
This example shows how to use enums from the C API.

 

      char brady_name[NUM_BRADYS][NC_MAX_NAME + 1] = {"Mike", "Carol", "Greg", "Marsha",
						       "Peter", "Jan", "Bobby", "Whats-her-face",
						       "Alice"};
      unsigned char brady_value[NUM_BRADYS] = {0, 1,2,3,4,5,6,7,8};
      unsigned char data[BRADY_DIM_LEN] = {0, 4, 8};
      unsigned char value_in;

      /* Create a file. */
      if (nc_create(FILE_NAME, NC_NETCDF4, &ncid)) ERR;

      /* Create an enum type based on unsigned bytes. */
      if (nc_def_enum(ncid, NC_UBYTE, BRADYS, &typeid)) ERR;
      for (i = 0; i < NUM_BRADYS; i++)
	 if (nc_insert_enum(ncid, typeid, brady_name[i], 
			    &brady_value[i])) ERR;

      /* Check it out. */
      if (nc_inq_user_type(ncid, typeid, name_in, &base_size_in, &base_nc_type_in,
			   &nfields_in, &class_in)) ERR;
      if (strcmp(name_in, BRADYS) || base_size_in != 1 ||
	  base_nc_type_in != NC_UBYTE || nfields_in != NUM_BRADYS || class_in != NC_ENUM) ERR;
      if (nc_inq_enum(ncid, typeid, name_in, &base_nc_type, &base_size_in, &num_members)) ERR;
      if (strcmp(name_in, BRADYS) || base_nc_type != NC_UBYTE || base_size_in != 1 ||
	  num_members != NUM_BRADYS) ERR;
      for (i = 0; i < NUM_BRADYS; i++)
      {
	 if (nc_inq_enum_member(ncid, typeid, i, name_in, &value_in)) ERR;
	 if (strcmp(name_in, brady_name[i]) || value_in != brady_value[i]) ERR;
      }

      /* Write an att of this enum type. */
      if (nc_put_att(ncid, NC_GLOBAL, ATT_NAME, typeid, BRADY_DIM_LEN, data)) ERR;
      
      /* Close the file. */
      if (nc_close(ncid)) ERR;

 


Previous: Enum CDL Example Next: Using the Opaque Type Table of contents Frames User guide
2008 Unidata NetCDF Workshop for Developers and Data Providers > User Defined Types in NetCDF-4