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fclose error codes Lake Orion, Michigan

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed a bullet shot into a suspended block Is it OK for graduate students to draft the research proposal for their advisor’s funding application (like NIH’s or NSF’s grant application)? If you change the reading unit to (file_size : SIZE-10) so that you have some good-luck bytes at then end, does it still crash? –Thomas L Holaday May 15 '09 at If all else fails, ask the user "I could not guarantee your data was saved, do you wish to try to save somewhere else?" Basically, the mantra is, if you can

It's very easy for something to go wrong and corrupt a file that hasn't been closed properly. share|improve this answer answered May 15 '09 at 14:38 Naveen 43.9k34116205 The same thing happens. –Geo May 15 '09 at 14:41 add a comment| up vote 0 down vote After all, what would your app do if the power went out after the last successful WriteFile, but before calling CloseHandle? Phaeron says: January 7, 2008 at 3:31 pm To expand on Inode Jones' point, the return value of fclose() should absolutely be checked and handled when writing a file -- even

Digital Diversity Can an ATCo refuse to give service to an aircraft based on moral grounds? Wrong. fclose flushes the buffers implicitly too, so it may fail for the same reasons. To ensure that the data is physically stored on disk the kernel buffers must be flushed too, for example, with sync(2) or fsync(2).

Parameters handle The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen(). DriverDude says: January 7, 2008 at 4:03 pm "So what should your program do when it gets an error from CloseHandle? It works fine as desired, but whenever I tried to close the file with fclose(), fclose() always returns EOF. BUT, if it fails closing a data file the user has open, you have options!

You’ll be auto redirected in 1 second. Personally, my attitude when designing functions like these is to return void, because if the programmer can't do anything about it anyway, telling him the error is more likely to hurt It does not guarantee that *your data* made it to disk even after you closed the handle. We appreciate your feedback.

Any suggestions why? Maurits [MSFT] says: January 7, 2008 at 3:15 pm So suppose you open a file that's on a network drive and cache the handle… And then sometime after your last WriteFile(…) However, users like to know their data is safe, so handle it in a safe way. People like DriverDude above point out that this is not necessarily the right answer for the second category; I agree.

With writes, well, you can't assume that the file caches were flushed from the last write if there's an error, so it's possible the file is now corrupt. Make space between rows constant This riddle could be extremely useful Training performance jumps up after epoch, Dev performance jumps down Emacs change window fringes (vertical padding)? So what should your program do when it gets an error from CloseHandle? What are Imperial officers wearing here?

Odds are good they're not going to know what you did or why, nor are they able to real throught the 12 billion lines else where (including libraries that may not As a result, any error that write() or fflush() can generate can be generated by fclose(). It never fails; it always succeeds, but possibly with errors. Join them; it only takes a minute: Sign up fclose() always returns EOF up vote 1 down vote favorite I have a function that reads integers with certain format from a

Scotá Aug 4 '12 at 5:01 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up Derived from Issue 1 of the SVID. G. Network failures are one classic example.

Yes No Additional feedback? 1500 characters remaining Submit Skip this Thank you! Regards. I pity the guys at Microsoft, you know someone there had to write some code "throw new OutOfMemoryException()" and had the darndest time getting it to work. if (fclose(myFile) == EOF) { // Handle the error!

Sum of neighbours Books for chess traps How would they learn astronomy, those who don't see the stars? Not a "end of file" indicator. My CEO wants permanent access to every employee's emails. You can't do anything with the error, so it's best ignored, logged, or disregarded.

This is for alignment with the ISO/IEC9899:1999 standard. However, I still receive the same fclose exception. Any unwritten buffered data for the stream shall be written to the file; any unread buffered data shall be discarded. Try running your program under valgrind.

A bullet shot into a door vs. If close() fails, there's not much you can do with THAT handle, but if the data you wrote is still available you can at least inform the user that the document Do you have bounds checkers, purify etc that you could run to check for buffer overruns, using a free'd memory block etc. The sequence went something like (paraphrased): stream = fopen(tempfile, "w"); if (stream == NULL) ...

Remember this when writing your own clean-up functions. To me, it's not about telling the programmer, it's about telling the user who could very well do something about it. Players stopping other player actions Cyberpunk story: Black samurai, skateboarding courier, Mafia selling pizza and Sumerian goddess as a computer virus How many answers does this question have? You have old data that you fread() from a file, and then do some processing on the data, generate more data, and then write it to a new file.

If a clean-up function fails, there's not much you can do because, well, how do you clean up from a failed clean-up? I am a student and still learning. I can only post the code after Sunday. Thanks and my apology.

To avoid problems and ensure (as far as you can from a C program), I suggest you: Properly handle errors returned by fwrite(). Sure you can detect the failure but to what end? Join them; it only takes a minute: Sign up Why is this C function crashing at fclose?