fopen error c Pinnacle North Carolina

Address Winston Salem, NC 27103
Phone (336) 462-9789
Website Link
Hours

fopen error c Pinnacle, North Carolina

Browse other questions tagged c file-io fopen stdio or ask your own question. it is typing error –John Dec 26 '11 at 8:31 please always take care for what you are typing in your code and also on SO –Jeegar Patel Dec Search: Reference fopen function fopen FILE * fopen ( const char * filename, const char * mode );Open file Opens the file whose name is specified in the parameter Dan -- Dan Pop DESY Zeuthen, RZ group Email: Da*****@ifh.de Currently looking for a job in the European Union Nov 14 '05 #13 P: n/a pete Richard Bos wrote: pete

fopen() always returns NULL when it fails, so we do know an error situation has arisen, but errno can give us more information on the *nature* of the error. Exiting...\n"); exit(EXIT_FAILURE); } quotient = dividend / divisor; fprintf(stderr, "Value of quotient : %d\n", quotient ); exit(EXIT_SUCCESS); } When the above code is compiled and executed, it produces the following result This change is to support large files. I tried append mode and it errors out so does not seem to be dangerous.

This is with FreeBSD 4.5 and PHP 4.3.1.

Logical fallacy: X is bad, Y is worse, thus X is not bad The 3x3 Hexa Prime Square Puzzle Why are Spanish adverbs formed using the feminine? GNU 2016-03-15 FOPEN(3) Copyright and license for this manual page HTML rendering created 2016-10-08 by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project. Here, EXIT_SUCCESS is a macro and it is defined as 0. How do I say "Thank you, Captain Obvious?" Where are sudo's insults stored?

Otherwise the suggestions about checking the path are probably correct... The global variable errno (found in ) contains information about what went wrong; you can use perror() to print that information as a readable string. -- Christopher Benson-Manica | I *should* ATTRIBUTES top For an explanation of the terms used in this section, see attributes(7). ┌─────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├─────────────────────────────┼───────────────┼─────────┤ │fopen(), fdopen(), freopen() │ Thread The file is created if it does not exist. "r+"read/update: Open a file for update (both for input and output).

The stream is positioned at the beginning of the file. If the file does not exist, attempt to create it. But here we don't have any information as to the nature ofthe error, because getc() does not set errno. How do investigators always know the logged flight time of the pilots?

The stream is positioned at the beginning of the file. If that operation is a wide-character operation, the stream is marked wide-oriented, and functions to convert to the coded character set are loaded. The file must exist. "w+" Creates an empty file for both reading and writing. "a+" Opens a file for reading and appending. On most library implementations, the errno variable is also set to a system-specific error code on failure.

There are exactly two things that can go wrong: an I/O error and an eof condition. EXAMPLES Opening a File The following example tries to open the file named file for reading. mode C string containing a file access mode. GNU man pages don't mention that fputc() sets errno, but SUS3 does.

If additional characters follow the sequence, the behavior depends on the library implementation: some implementations may ignore additional characters so that for example an additional "t" (sometimes used to explicitly state macros from errno.h have negative values (the Std doesn't seem to restrict this, but I haven't met a system where this would be true)? -- Stan Tobias sed 's/[A-Z]//g' to email The result of applying fdopen() to a shared memory object is undefined. The returned pointer can be disassociated from the file by calling fclose or freopen.

This is strictly for compatibility with C89 and has no effect; the 'b' is ignored on all POSIX conforming systems, including Linux. (Other systems may treat text files and binary files A value of 0 indicates that there is no error in the program. The word "null" is commonly used to refer to certain pointer values (NULL) and character values ((char)'\0'), but rarely used to refer to a zero integer value. share|improve this answer answered Dec 26 '11 at 7:57 Francis Upton 15.7k13442 add a comment| up vote 1 down vote You can do man fopen - it says Upon successful completion

The fdopen() function may also fail and set errno for any of the errors specified for the routine fcntl(2). What is the purpose of setting errno to zero before function call? Can Dandelion defeat you? No similarity in sight.

If you are unsure whether filename is a file or a directory, you may need to use the is_dir() function before calling fopen().

See Also Supported Protocols and Wrappers fclose() Some people think that's a reason not to use perror() after fopen() fails: the error message may have nothing at all to do with the failure and could be misleading. The DESCRIPTION is updated to avoid use of the term "must" for application requirements. E.g.

Are independent variables really independent? thanks for the heads up. -- Christopher Benson-Manica | I *should* know what I'm talking about - if I ataru(at)cyberspace.org | don't, I need to know. You can do that by setting your user_agent to one that is known only to support HTTP/1.0 (most webservers will be configured to force HTTP/1.0 for some browsers). Saying "no such file" when the problem could be completely different is bad practice and will make debugging harder. –Mat Apr 11 '11 at 7:16 add a comment| up vote 1

Macros that begin with E and a digit or E and an uppercase letter are in the implementation name space and can't be defined by portable programs. This flag is ignored for fdopen(). r+ Open for reading and writing. It shows the following warning: Warning 1 warning C4133: 'function' : incompatible types - from 'FILE *' to 'const char *.

In this mode, fseek() only affects the reading position, writes are always appended. 'x' Create and open for writing only; place the file pointer at the beginning of the file. However, the application shall ensure that output is not directly followed by input without an intervening call to fflush() or to a file positioning function ( fseek(), fsetpos(), or rewind()), and IIRC positive values were system errors (from errno.h), low negative values were reserved for the library errors (it supplied its own strerror()), and high negative numbers (nearer zero) were reserved for To work around this, the value of error_reporting should be lowered to a level that does not include warnings.

The project died when its main advocates realised that they can't do as much as they intended within the constraints of the C standard (mainly, they felt that a library that Parameters filename If filename is of the form "scheme://...", it is assumed to be a URL and PHP will search for a protocol handler (also known as a wrapper) for that I would see nothing wrong if on some implementaton getc() could fail and set errno to ETEA, where strerror(ETEA) returned: "it's after 5pm, CPU is having tea-time, be back in 20 The returned stream is fully buffered by default if it is known to not refer to an interactive device (see setbuf).

NOTES top Glibc notes The GNU C library allows the following extensions for the string specified in mode: c (since glibc 2.3.3) Do not make the open The [ELOOP] mandatory error condition is added. Is it from the command line or from an IDE? If a function communicates errors though errno, it is required either to set errno to an error value, or to leave errno with the same value as before the call.

Otherwise, the behavior is undefined. The standard guarantees that for a restricted set of library functions, but a good implementation should use errno whenever there is no other way of telling why a function failed.