std::ferror - cppreference.com (original) (raw)

C++

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Input/output library

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C-style I/O

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| Defined in header | | | | -------------------------------------------------------------------------- | | | | int ferror( std::FILE* stream ); | | |

Checks the given stream for errors.

Contents

• 1 Parameters
• 2 Return value
• 3 Example
• 4 See also

[edit] Parameters

[edit] Return value

Nonzero value if the file stream has errors occurred, ​0​ otherwise.

[edit] Example

Run this code

#include #include #include #include   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