2012年9月9日 · Calling getc again will result in a call to read, the setting of the _IOEOF flag, and this will cause feof to return true. However, after reading the number from the same file using fscanf("%d", &n), feof will immediately return true, because fscanf will have tried to read additional digits of the integer.

You should never use feof() as the exit indicator for a loop. feof() is TRUE only after the end of file (EOF) is read, not when EOF is reached. Source here. It also explains the problem in detail and how to fix it.

2016年3月23日 · feof checks an end-of-file indicator set after a read that attempted to read at or past the end of file. It is useful in situations where code that you don't control was reading from the file, and you want to stop the processing once the file has been exhausted.

2010年4月14日 · feof() doesn't works as "eof is set only when a read request for non-existent byte is made". So, I can ...

2008年10月7日 · Calling feof() on a closed file is meaningless (actually worse than meaningless - it's undefined so anything can happen). From the C standard: The value of a pointer to a FILE object is indeterminate after the associated file is closed (including the standard text streams).

2013年3月30日 · It means that the way the feof() function (and other functionality with regards to EOF in general) is used is often misunderstood and wrong. So is your code. So is your code. First, fscanf() doesn't always do what you think it does, and getting lines from a file is better performed using fgets() .

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Seeking beyond the EOF will enlarge the file after a subsequent write, so this is conformant, contrary to what others believe.

2014年3月25日 · feof will never return true until an actual read attempt is made, and EOF has been reached. The read attempts usually have return values that indicate failure. The read attempts usually have return values that indicate failure.

2021年9月3日 · I am migrating my project from PHP 5.X to PHP 8.0.8 but I have a problem with a script. The script allows users to export the selected clip's to a zip file, I've been testing it and it seems to wor...