Example

       #include <stdlib.h>
       #include <stdio.h>
       #include <locale.h>
       #include <wchar.h>

       main()
       {
           wchar_t wstr[80],
                  *ret;
           FILE *fp;

           /* Create a dummy data file  */

           if ((fp = fopen("file.dat", "w+")) == NULL) {
               perror("open");
               exit(1);
           }

           fprintf(fp, "this is a test\n") ;
           fclose(fp) ;

          /* Open a test file containing : "this is a test" */

           if ((fp = fopen("file.dat", "r")) == (FILE *) NULL) {
               perror("File open error");
               exit(EXIT_FAILURE);
           }

           ret = fgetws(wstr, 80, fp);
           if (ret == (wchar_t *) NULL) {
               perror("fgetws failure");
               exit(EXIT_FAILURE);
           }

           fputws(wstr, stdout);
           fclose(fp);
           delete("file.dat");
       }