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Windows) the file must be opened with 'b' included in fopen() mode parameter. $filename="c:\\files\\somepic.gif";

If an error occurs, the resulting value of the file position indicator for the stream is unspecified. There are two ways to write error-free programs; only the third one works.* 03-12-2006 #10 cdalten View Profile View Forum Posts Registered User Join Date Jan 2006 Location Berkeley, Ca Posts In any case, due to buffering stdio makes it essentially impossible to know how much was successfully written, so if you encounter a write error, you usually need to consider the Any advice or help is appreciated.

size The original size, exactly as passed to the fread(3) system call. size Size, in bytes, of each element to be read. nmemb The original nmemb, exactly as passed to the fread(3) system call. share|improve this answer answered Feb 22 '12 at 5:51 R.. 127k15189421 add a comment| up vote 2 down vote Upon successful completion, fread() shall return the number of elements successfully

Privacy policy About Disclaimers Developer Network Developer Network Developer Sign in MSDN subscriptions Get tools Downloads Visual Studio MSDN subscription access SDKs Trial software Free downloads Office resources SharePoint Server is right. I got a stack overflow :( –polslinux Jun 15 '12 at 16:48 but why do you check bytes > 0 ? count Number of elements, each one with a size of size bytes.

Always calculate a $seek_end even though the range specification says it could be empty... eg: bytes 500-/1234
4. Feb 22 '12 at 6:05 | show 1 more comment Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign Cyclically sort lists of mixed element types?

If an error occurs, the resulting value of the file position indicator for the stream is indeterminate. The following changes are made for alignment with the ISO/IEC9899:1999 standard: The fread() prototype is updated. In both cases, the proper indicator is set, which can be checked with ferror and feof, respectively. Typically because it hit the end of file, but possibly for some other reason.

You have docs that disagree with the one I posted? –Steve Feb 22 '12 at 5:57 @R.. - I'm pretty sure that if you request "5" items of size This function is intended to be used in a fashion similar to the following example: size_t how_many = fread(ptr, size, nmemb, fp); if (how_many == 0 && ferror(fp)) { fprintf(stderr, "%s\n", Join them; it only takes a minute: Sign up do fread and fwrite have failure? If a suitable message return buffer is supplied, this function is thread safe.

Removed some Cache headers that didn't seem to be needed. (add back if you have problems)
5. If this number differs from the count parameter, either a reading error occurred or the end-of-file was reached while reading. Parameters handle A file system pointer resource that is typically created using fopen(). Code: while (fread == bytes to be read); if (we aren't at EOF) do error stuff 03-12-2006 #3 cdalten View Profile View Forum Posts Registered User Join Date Jan 2006 Location

The content you requested has been removed. share|improve this answer answered Jun 15 '12 at 16:43 Jerry Coffin 320k31352745 1 but how can i check the return value of fwrite? At that point and time, the loop would terminate and hence the file would no longer be read. Why are Spanish adverbs formed using the feminine?

Generate a 6 character string from a 15 character alphabet Why is absolute zero unattainable? Physically locating the server Framing "standalone" class output with "framed" and others What does かぎのあるヱ mean? C/C++ Language and Standard Libraries C Run-Time Library Reference Alphabetical Function Reference Alphabetical Function Reference fread fread fread abort abs, labs, llabs, _abs64 access _access, _waccess _access_s, _waccess_s acos, acosf, acosl asked 4 years ago viewed 9586 times active 4 years ago Linked 0 correct use of error checking (incl.

Removing elements from an array that are in another array What does it actually mean by specified time? This means that you should collect the data together in chunks as shown in the examples below. //ForPHP5andup

If the given stream is opened in text mode, carriage return–linefeed pairs are replaced with single linefeed characters. Browse other questions tagged c return-value fwrite fread or ask your own question. ptr The original ptr, exactly as passed to the fread(3) system call. fread Visual Studio 2015 Other Versions Visual Studio 2013 Visual Studio 2012 Visual Studio 2010 Visual Studio 2008 Visual Studio 2005 Visual Studio .NET 2003  Reads data from a stream.Syntax Copy

Last edited by cdalten; 03-12-2006 at 06:40 PM. 03-12-2006 #7 Tonto View Profile View Forum Posts Visit Homepage Registered User Join Date Jun 2005 Location New York Posts 1,465 The internal If size or nitems is 0, fwrite() shall return 0 and the state of the stream remains unchanged. New tech, old clothes Cyberpunk story: Black samurai, skateboarding courier, Mafia selling pizza and Sumerian goddess as a computer virus Are independent variables really independent? bytes_read = fread(buf, sizeof(buf), 1, fp); ...

RETURN VALUES The functions fread() and fwrite() advance the file position indicator for the stream by the number of bytes read or written. If it fails, you would normally not try again. The position indicator of the stream is advanced by the total amount of bytes read. Derived from Issue 1 of the SVID.

POSIX is a registered Trademark of The IEEE. [ Main Index | XBD | XCU | XSH | XRAT ] Search: Reference fread function fread size_t fread ( ferror) when using fread and fwrite Related 3fread/fwrite string in C0fwrite, fread - problems with fread0Issue with fwrite and fread1fread and fwrite have difference result-1C fread fwrite at the beginning of size_t is an unsigned integral type. I mean something like: while (!feof(file_to_copy)){ bytes = fread(buffer, 1, sizeof(buffer), file_to_copy); fwrite(buffer, 1, bytes, new_file); memset(buffer, 0, sizeof(buffer)); } c return-value fwrite fread share|improve this question edited Jun 15 '12

This will be overwritten by the next call to any libexplain function which shares this buffer, including other threads. All rights reserved. Thanks $filename = (strstr($_SERVER['HTTP_USER_AGENT'], 'MSIE')) ?

The least the message will contain is the value of strerror(errnum), but usually it will do much better, and indicate the underlying cause in more detail. What does it actually mean by specified time? nmemb The original nmemb, exactly as passed to the fread(3) system call.