第十四章结构和其他数据形式

关于fread以及fwrite

• fread(char* buff,int size,int count,FILE* fp)
• fwrite(char* buff,int size,int count,FILE* fp)

#include<stdio.h>

#include<string.h>

typedef struct book_s

{

 int count;

 char name[100];

 char author[100];

 float price;

}Book;

int main()

{

   Book books[3] ;

   strcpy(books[0].name,"liuchuanwu0" );

   strcpy(books[0].author,"liu chuan wu 0");

   books[0].price = 1.00;

   strcpy(books[1].name,"liuchuanwu1" );

   strcpy(books[1].author,"liu chuan wu 1");

   books[1].price = 1.00;

   strcpy(books[2].name,"liuchuanwu2" );

   strcpy(books[2].author,"liu chuan wu 2");

   books[2].price = 1.02;

   FILE * fp =fopen("./book.list","a+");

   int index ;

  for(index=0;index<3;index++)

  {

   fwrite(&books[index],sizeof(Book),1,fp);

  }

  memset(&books[2],0,sizeof(Book));

  printf("%s \n",books[2].name);

  rewind(fp) ;

  fread(&books[2],sizeof(Book),1,fp);

  printf("%s \n",books[2].name);

}

结果如下：–结构体可以正常的转存入文件，且vim查看存在乱码，但是可以正常的读写 
linux:/home/lcw/code # ./a.out

liuchuanwu0 
linux:/home/lcw/code # cat book.list 
pղKliuchuanwu0¢ÿÿÿÿ¢p¢¢D.ι 
¶ҩ¸@ 
liu chuan wu 0۩h¢.N=