檔案錯誤 – 如何處理檔案的錯誤狀況

程式範例

  #include <stdio.h>
  #include <stdlib.h>

  int main(int argc, char *argv[]) {
    FILE *in, *out;
    char ch;

    if((in=fopen(argv[1], "rb")) == NULL) {
      perror("Error");
      exit(1);
    }

    while(!feof(in)) {
      ch = getc(in);
      if(ferror(in)) {
        perror("Error");
        clearerr(in);
        break;
      }
      putchar(ch);
    }
    fclose(in);
    return 0;
  }```
**執行結果**

  D:\cp>gcc ferror.c -o ferror

  D:\cp>ferror
  Error: No such file or directory

  D:\cp>ferror exist.not
  Error: No such file or directory

  D:\cp>ferror ferror.c
  #include <stdio.h>
  #include <stdlib.h>

  int main(int argc, char *argv[]) {
    FILE *in, *out;
    char ch;

    if((in=fopen(argv[1], "rb")) == NULL) {
      perror("Error");
      exit(1);
    }

    while(!feof(in)) {
      ch = getc(in);
      if(ferror(in)) {
        perror("Error");
        clearerr(in);
        break;
      }
      putchar(ch);
    }
    fclose(in);
    return 0;
  }