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fgetwc

From cppreference.com
< c‎ | io
 
 
File input/output
Types and objects
Functions
File access
Direct input/output
Unformatted input/output
fgetwcgetwc
(C95)(C95)
(C95)
(C95)(C95)
(C95)
(C95)
Formatted input
 
Defined in header <wchar.h>
wint_t fgetwc( FILE *stream );
(since C95)
wint_t getwc( FILE *stream );
(since C95)

Reads the next wide character from the given input stream. getwc() may be implemented as a macro and may evaluate stream more than once.

Contents

[edit] Parameters

stream - to read the wide character from

[edit] Return value

The next wide character from the stream or WEOF on failure.

If the failure has been caused by end-of-file condition, additionally sets the eof indicator (see feof()) on stream. If the failure has been caused by some other error, sets the error indicator (see ferror()) on stream.

If an encoding error occurred, additionally sets errno to EILSEQ.

[edit] Example

#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include <errno.h>
#include <locale.h>
 
int main(void)
{
    setlocale(LC_ALL, "en_US.utf8");
    FILE *fp = fopen("fgetwc.dat", "w");
    if(!fp) {
        perror("Can't open file for writing");
        return EXIT_FAILURE;
    }
    fputs("кошка\n", fp);
    fclose(fp);
 
    fp = fopen("fgetwc.dat", "r");
    if(!fp) {
        perror("Can't open file for reading");
        return EXIT_FAILURE;
    }
    wint_t wc;
    errno = 0;
    while ((wc = fgetwc(fp)) != WEOF)
        putwchar(wc);
 
    if (ferror(fp)) {
        if (errno == EILSEQ)
            puts("Character encoding error while reading.");
        else
            puts("I/O error when reading");
    } else if (feof(fp))
        puts("End of file reached successfully");
 
    fclose(fp);
}

Output:

кошка

[edit] References

  • C11 standard (ISO/IEC 9899:2011):
  • 7.29.3.1 The fgetwc function (p: 421-422)
  • 7.29.3.6 The getwc function (p: 424)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.24.3.1 The fgetwc function (p: 367)
  • 7.24.3.6 The getwc function (p: 369)

[edit] See also

gets a character from a file stream
(function) [edit]
(C95)
gets a wide string from a file stream
(function) [edit]
writes a wide character to a file stream
(function) [edit]
puts a wide character back into a file stream
(function) [edit]