Page 157 - C-Language
P. 157
}
/* do some processing and try opening the file differently, then */
if (last_error) {
fprintf(stderr, "fopen: Could not open %s for writing: %s",
argv[1], strerror(last_error));
fputs("Cross fingers and continue", stderr);
}
/* do some other processing */
return EXIT_SUCCESS;
}
perror
To print a user-readable error message to stderr, call perror from <stdio.h>.
int main(int argc, char *argv[])
{
FILE *fout;
if ((fout = fopen(argv[1], "w")) == NULL) {
perror("fopen: Could not open file for writing");
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
This will print an error message concerning the current value of errno.
Read Error handling online: https://riptutorial.com/c/topic/2486/error-handling
https://riptutorial.com/ 133
