std::ferror
From cppreference.com
| Defined in header <cstdio>
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| int ferror( std::FILE* stream ); |
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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 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
See also
| clears errors (function) | |
| checks for the end-of-file (function) | |
| checks if an error has occurred (public member function of std::basic_ios) | |
| C documentation for ferror
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