Clearing file contents only using FILE *

Asked Feb 14 '14 at 08:29

Active Jun 10 '20 at 13:12

Viewed 62 times

I need to clear the content of a file, but the path of that file is not reachable, unless i do large modifications. I only have the stream pointer (FILE *). I could do reopen() but, it is not available on EVC4.

Is there another way to clear a file's contents only using a FILE *?

edited Jun 10 '20 at 13:12

braX

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asked Feb 14 '14 at 08:29

Virus721

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Sorry i forgot to mention that i'm coding on/for Windows, even though EVC4 is a Windows only IDE. – Virus721 Feb 14 '14 at 08:38
The second answer works on Windows. – user2357112 Feb 14 '14 at 08:38
It doesn't seem to. This function expects an integer and not a FILE pointer, so unless it is possible to cast a FILE * to an integer, it won't work. – Virus721 Feb 14 '14 at 08:40
That would be the `fileno` part, which gets the file descriptor corresponding to a `FILE *`. – user2357112 Feb 14 '14 at 08:43
int changesize(FILE *fp, __int64 size) { int filedes = _fileno(fp); return _chsize_s(filedes, size); } – Abhineet Feb 14 '14 at 08:48
http://stackoverflow.com/questions/584639/truncate-file – Abhineet Feb 14 '14 at 08:49

Clearing file contents only using FILE *

0 Answers0