std::ferror
Defined in header <cstdio> | ? | ? |
|---|---|---|
int ferror( std::FILE* stream ); | ? | ? |
检查给定流是否有错误。
参数
stream | - | the file stream to check |
|---|
返回值
如果文件流发生错误，则为非零值，?0?否则。
例
二次
#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");
}二次
产出：
二次
Error indicator set二次
另见
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) |
C错误文档
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