怎样用c语言实现磁盘文件系统的 *** 作

#include "stdio.h"

#include "conio.h"

struct filesys_superblk

{ /*文件系统的分区信息，存放在0#物理块中哪稿扮*/

unsigned long fs_size/*整个李灶分区的总磁盘物理块数 */

unsigned long fs_freesize/*分区的所有空闲磁盘物理块数 */

unsigned int fs_blocksize/*文件系统的物理块大小（字节）*/

unsigned int fs_fat_start/*FAT的起始磁盘物理块号 */

unsigned int fs_fat_size/*FAT占用的磁盘物理块数*/

unsigned int fs_dir_start/*根目录的起始磁盘物理块号*/

unsigned int fs_dir_size/*根目录占用的磁盘物理块数*/

unsigned int fs_data_start/*数据区起始磁盘物理块号*/

unsigned long fs_data_size/敬罩*数据区的磁盘物理块数*/

}

struct FILE_FCB

{ /*文件控制块结构 */

char f_name[16]/*文件名（16B）*/

short f_mode/*文件属性，-1表示未用 0表示目录 1表示文件*/

unsigned int f_asize/*文件分配的大小（物理块数）*/

unsigned long f_rize/*文件占用的实际大小（字节）*/

unsigned long f_addr/*文件分配的第一个物理块的块号*/

unsigned int f_ctime/*文件创建时间*/

unsigned int f_mtime/*文件修改时间*/

}

#include <stdlib.h>//为了使用exit()

int main()

{

char ch

FILE* fp

char fname[50]//用于存放文件名

printf("输入文件名：")

scanf("%s",fname)

fp=fopen(fname,"r")//只供读取

if(fp==NULL) //如果失败了

{

printf("错误灶和键！"棚此)

exit(1)//中止程序

}

//getc()用于在打开文件中获取一个字符

while((ch=getc(fp))!=EOF)

putchar(ch)

fclose(fp)//关闭文件

return 0

}

注意！初学者往往会犯一个错误，即在输入文件名时不加后缀名隐巧，请注意加上！

程序示例2[2]

#include <stdio.h>

FILE *stream, *stream2

int main( void )

{

int numclosed

// Open for read (will fail if file "crt_fopen.c" does not exist)

if( (stream = fopen( "crt_fopen.c", "r" )) == NULL ) // C4996

// Note: fopen is deprecatedconsider using fopen_s instead

printf( "The file 'crt_fopen.c' was not opened\n" )

else

printf( "The file 'crt_fopen.c' was opened\n" )

// Open for write

if( (stream2 = fopen( "data2", "w+" )) == NULL ) // C4996

printf( "The file 'data2' was not opened\n" )

else

printf( "The file 'data2' was opened\n" )

// Close stream if it is not NULL

if( stream)

{

if ( fclose( stream ) )

{

printf( "The file 'crt_fopen.c' was not closed\n" )

}

}

// All other files are closed:

numclosed = _fcloseall( )

printf( "Number of files closed by _fcloseall: %u\n", numclosed )

}