[C] 파일 입출력

저장하기

void save(bm *book[])
{
 FILE *fp;
 int i=0;
 int len;

 fp = fopen("input.txt", "w");

 if(fp == NULL)
 {
  printf("error");
  return;
 }
// fprintf(fp, "%d ", a);
 for(i=0;ibookname)+1;
  fprintf(fp, "%d ", len);
  fprintf(fp, "%s ", book[i]->bookname);
  len = strlen(book[i]->writer)+1;
  fprintf(fp, "%d ", len);
  fprintf(fp, "%s ", book[i]->writer);
  fprintf(fp, "%d\n", book[i]->price);
 }
 fclose(fp);
}

불러오기

void load(bm *book[])
{
 FILE *fp;
 char temp[50];
 int i=0;
 int len;

 fp = fopen("input.txt", "r");

 if(fp == NULL)
 {
  printf("로드 실패\n");
  return;
 }
 fscanf(fp, "%d", &a);
 
 for(i=0;ibookname[50] = (char*)malloc(len+1);  
  fscanf(fp, "%s ", temp);
  strcpy(book[i]->bookname, temp);
  fscanf(fp, "%d ", &len);
  book[i]->writer[20] = (char*)malloc(len+1);  
  fscanf(fp, "%s ", temp);
  strcpy(book[i]->writer, temp);  
  fscanf(fp, "%d\n", &book[i]->price);
 }
 fclose(fp);
}