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std::ferror(3) C++ Standard Libary std::ferror(3) NAME std::ferror - std::ferror Synopsis Defined in header <cstdio> int ferror( std::FILE* stream ); Checks the given stream for errors. Parameters stream - the file stream to check Return value Nonzero value if the file stream has errors occurred, 0 otherwise Example // Run this code #include <cstdio> #include <cstdlib> #include <clocale> #include <cwchar> int main(void) { 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 se- quence 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 See also clearerr clears errors (function) feof checks for the end-of-file (function) fail checks if an error has occurred (public member function of std::basic_ios<CharT,Traits>) http://cppreference.com 2022.07.31 std::ferror(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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