ferror

 

The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.

The latest version of this topic can be found at ferror.

Tests for an error on a stream.

Syntax

int ferror(   
   FILE *stream   
);  

Parameters

stream
Pointer to FILE structure.

Return Value

If no error has occurred on stream, ferror returns 0. Otherwise, it returns a nonzero value. If stream is NULL, ferror invokes the invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, this function sets errno to EINVAL and returns 0.

See _doserrno, errno, _sys_errlist, and _sys_nerr for more information on these, and other, error codes.

Remarks

The ferror routine (implemented both as a function and as a macro) tests for a reading or writing error on the file associated with stream. If an error has occurred, the error indicator for the stream remains set until the stream is closed or rewound, or until clearerr is called against it.

Requirements

Function	Required header
ferror	<stdio.h>

For additional compatibility information, see Compatibility in the Introduction.

Example

See the example for feof.

.NET Framework Equivalent

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.

See Also

Error Handling
Stream I/O
clearerr
_eof
feof
fopen, _wfopen
perror, _wperror