fread error Ronald Washington

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fread error Ronald, Washington

OTOT, another fully successful call to fread() like fread(readbuf, sizeof(char), 5 , stdin); will also return 5 while it will read sizeof(char) * 5 bytes, i.e., 5 bytes. fp The original fp, exactly as passed to the fread(3) system call. At that point and time, the loop would terminate and hence the file would no longer be read. If an error occurs, or the end-of- file is reached, the return value is a short object count (or zero).

If an error occurs, the resulting value of the file position indicator for the stream is unspecified. Otherwise, if a write error occurs, the error indicator for the stream shall be set,and errno shall be set to indicate the error The ferror() or feof() functions must be used UNIX is a registered Trademark of The Open Group. They return the number of objects read or written.

A Shadowy Encounter Why does argv include the program name? Join them; it only takes a minute: Sign up fread() return value in C up vote 2 down vote favorite I am trying to understand how the fread() function in With modern technology, is it possible to permanently stay in sunlight, without going into space? Is the NHS wrong about passwords?

Also can anyone provide me with some example return values and their meanings? By Yarin in forum General Discussions Replies: 37 Last Post: 07-24-2009, 11:40 AM Wireless Network Linux & C Testbed By james457 in forum Networking/Device Communication Replies: 3 Last Post: 06-11-2009, 11:03 Hope it's clear now. :-) –Sourav Ghosh Feb 8 '15 at 19:56 add a comment| up vote 0 down vote number of items read or written means the number of objects Hosting by jambit GmbH.

SEE ALSO feof(), ferror(), fgetc(), fopen(), getc(), gets(), scanf(), the Base Definitions volume of IEEEStd1003.1-2001, CHANGE HISTORY First released in Issue 1. size_t bytes_read; char buf[100]; FILE *fp; ... It is easier to write an incorrect program than understand a correct one. 40. As you can see, here, the number of items read or written is not equal to the number of bytes transferred.

This number equals the number of bytes transferred only when size is 1. Otherwise, if a read error occurs, the error indicator for the stream shall be set, and errno shall be set to indicate the error. Not the answer you're looking for? share|improve this answer edited Feb 8 '15 at 20:01 answered Feb 8 '15 at 19:25 Sourav Ghosh 70.9k1173130 what happens when size != 1 though?

a bullet shot into a suspended block How to prevent Beamer from repeatedly expanding macros in \frametitle when frame-breaking Security Patch SUPEE-8788 - Possible Problems? The following changes are made for alignment with the ISO/IEC9899:1999 standard: The fread() prototype is updated. When you intend to read N bytes from FILE to buffer it should return N and you can store it in a variable to see if it really read all the Not the answer you're looking for?

If it's not - you should use ferror() or feof() to determine whether you've reached the end of the file and/or encountered an error. Couldn't I go like: Code: while(fread(&log_file,sizeof(struct utmp),1,fp) == 1) { process_type(&log_file); if( (ferror(fp)) || (feof(fp)) ) exit(1); } The loop would continue to read the file until it encountered either an count Number of elements, each one with a size of size bytes. For nonlocking counterparts, see unlocked_stdio(3).

For example if you have a file that contains 4 32bit ints, you can read it with elements_read=fread(buf,sizeof(int),4,fp); bytes_read then should be 4 if no errors occured share|improve this answer edited up vote 8 down vote favorite when I read from a file using fread (C language), the return value of fread sometimes would be 0. What does かぎのあるヱ mean? The file position indicator for the stream is advanced by the number of characters read.

You can distinguish between them by checking feof() and ferror(). ptr The original ptr, exactly as passed to the fread(3) system call. bytes_read = fread(buf, sizeof(buf), 1, fp); ... If it the return value != N, it means an error happened.

fread() does not distinguish between end-of-file and error, and callers must use feof(3) and ferror(3) to determine which occurred. RETURN VALUES The functions fread() and fwrite() advance the file position indicator for the stream by the number of bytes read or written. share|improve this answer answered Feb 22 '12 at 5:49 Vaughn Cato 42k44370 add a comment| up vote 0 down vote Yes. Could someone please explain to me what is meant by number of items read or written in this context.

EDIT for example, a fully successful call to fread() like fread(readbuf, sizeof(int), 5 , stdin); will return 5 while it will read sizeof(int) * 5 bytes. Can I buy my plane ticket to exit the US to Mexico? If this number differs from the count parameter, either a reading error occurred or the end-of-file was reached while reading. 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

Are there any pre-built Monero miners for Linux? More items may be available. $ echo "Hello World" | ./a.out read 8 bytes Related reading: What is the rationale for fread/fwrite taking size and count as arguments? asked 1 year ago viewed 4902 times active 1 year ago Visit Chat Linked 51 How does fread really work? 63 What is the rationale for fread/fwrite taking size and count is right.

Join them; it only takes a minute: Sign up fread() return value in C up vote 2 down vote favorite I am trying to understand how the fread() function in Modifying your example. What does dot forward slash forward slash mean (.//)? It returns the number of items successfully read from the stream.

Consider the following program. #include int main() { char buf[8]; size_t ret = fread(buf, sizeof(*buf), sizeof(buf)/sizeof(*buf), stdin); printf("read %zu bytes\n", ret*sizeof(*buf)); return 0; } When we run this program, depending The following sections are informative. Return Value The total number of elements successfully read is returned.