C语言函数—matherr

函数名

lseek

功 能

移动文件读/写指针

用 法

long lseek(int handle, long offset, int fromwhere);

程序例

#include <sysstat.h> 
#include <string.h> 
#include <stdio.h> 
#include <fcntl.h> 
#include <io.h> 

int main(void) 
{ 
   int handle; 
   char msg[] = "This is a test"; 
   char ch; 

   /* create a file */ 
   handle = open("TEST.$$$", O_CREAT | O_RDWR, S_IREAD | S_IWRITE); 

   /* write some data to the file */ 
   write(handle, msg, strlen(msg)); 

   /* seek to the begining of the file */ 
   lseek(handle, 0L, SEEK_SET); 

   /* reads chars from the file until we hit EOF */ 
   do 
   { 
      read(handle, &ch, 1); 
      printf("%c", ch); 
   }  while (!eof(handle)); 

   close(handle); 
   return 0; 
}