std::ferror
From cppreference.com
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Input/output library
Print functions (C++23)
Buffers
(C++23)
(C++98/26*)
(C++20)
Streams
Abstractions
File I/O
String I/O
Array I/O
(C++23)
(C++23)
(C++23)
(C++98/26*)
(C++98/26*)
(C++98/26*)
Synchronized Output
(C++20)
Types
Error category interface
(C++11)
(C++11)
C-style I/O
Types and objects
Functions
File access
Direct input/output
Unformatted input/output
Formatted input
(C++11)(C++11)(C++11)
(C++11)(C++11)(C++11)
Formatted output
(C++11)
(C++11)
File positioning
Error handling
ferror
Operations on files
Defined in header
<cstdio>
int ferror( std::FILE * stream );
Checks the given stream for errors.
Contents
[edit] Parameters
stream
-
the file stream to check
[edit] Return value
Nonzero value if the file stream has errors occurred, 0 otherwise.
[edit] Example
Run this code
#include <clocale> #include <cstdio> #include <cstdlib> #include <cwchar> int main() { const char *fname = std::tmpnam (nullptr); std::FILE * f = std::fopen (fname, "wb"); std::fputs ("\xff\xff\n", f); // not a valid UTF-8 character sequence std::fclose (f); std::setlocale (LC_ALL, "en_US.utf8"); f = std::fopen (fname, "rb"); std::wint_t ch; while ((ch=std::fgetwc (f)) != WEOF) // attempt to read as UTF-8 std::printf ("%#x ", ch); if (std::feof (f)) puts("EOF indicator set"); if (std::ferror(f)) puts("Error indicator set"); }
Output:
Error indicator set
[edit] See also
C documentation for ferror