Example

       #include <stdio.h>
       #include <iconv.h>
       #include <errno.h>

       int main()
       {
         /* Declare variables to be used                      */

         char fromcodeset[30];
         char tocodeset[30];
         int iconv_opened;
         iconv_t iconv_struct;       /* Iconv descriptor      */

         /* Initialize variables                              */

         sprintf(fromcodeset, "DECHANYU");
         sprintf(tocodeset, "EUCTW");
         iconv_opened = FALSE;

         /* Attempt to create a conversion descriptor for the */
         /* codesets specified. If the return value from      */
         /* iconv_open is -1 then an error has occurred.      */
         /*  Check the value of errno.                        */

         if ((iconv_struct = iconv_open(tocodeset, fromcodeset))
            == (iconv_t) - 1) {

             /* Check the value of errno                      */

             switch (errno) {
             case EMFILE:
             case ENFILE:
                 printf("Too many iconv conversion files open\n");
                 break;

             case ENOMEM:
                 printf("Not enough memory\n");
                 break;

             case EINVAL:
                 printf("Unsupported conversion\n");
                 break;

             default:
                 printf("Unexpected error from iconv_open\n");
                 break;
            }
         }
         else

             /* Successfully allocated a conversion descriptor   */

             iconv_opened = TRUE;

         /*  Was a conversion descriptor allocated               */

          if (iconv_opened) {

             /* Attempt to deallocate the conversion descriptor. */
             /* If iconv_close returns -1 then an error has      */
             /* occurred.                                        */

             if (iconv_close(iconv_struct) == -1) {

                 /* An error occurred. Check the value of errno  */

                 switch (errno) {
                 case EBADF:
                     printf("Conversion descriptor is invalid\n");
                     break;
                 default:
                     printf("Unexpected error from iconv_close\n");
                     break;
                 }
             }
         }
         return (EXIT_FAILURE);
       }