|
ferror
int ferror (FILE * stream); | stdio.h |
| cplusplus.com |
Check for errors.
Tests if a error has occurred in the last reading or writing operation with the
given stream, returning a non-zero value in case of error.
If indeed there has been an error the error indicator will not be modified by a call
to this function. You should call clearerr or
rewind to reset it.
Parameters.
Return Value.
If there were no errors a 0 value is returned.
Otherwise a non-zero value is returned and the error indicator of the stream will remain set.
Example.
/* ferror example: writing error */
#include <stdio.h>
main ()
{
FILE * pFile;
pFile=fopen("myfile.txt","r");
if (pFile==NULL) perror ("Error opening file");
else {
fputc ('x',pFile);
if (ferror (pFile))
printf ("Error Writing to myfile.txt\n");
fclose (pFile);
}
return 0;
}
This program opens an existing file called myfile.txt in read-only mode
but tries to write a character on it, generating an error that is detected by
ferror.
Output.
Error Writing to myfile.txt
See also.
feof,
clearerr,
perror