随机块写

[c]代码库

#include <process.h> 
#include <string.h> 
#include <stdio.h> 
#include <dos.h> 

int main(void) 
{ 
   char far *save_dta; 
   char line[80]; 
   char buffer[256] = "RANDBWR test!"; 
   struct fcb blk; 
   int result; 

   /* get new file name from user */ 
   printf("Enter a file name to create (no path - ie. a:file.dat\n"); 
   gets(line); 

   /* parse the new file name to the dta */ 
   parsfnm(line,&blk,1); 
   printf("Drive #%d  File: %s\n", blk.fcb_drive, blk.fcb_name); 

   /* request DOS services to create file */ 
   if (bdosptr(0x16, &blk, 0) == -1) 
   { 
      perror("Error creating file"); 
      exit(1); 
   } 

   /* save old dta and set new dta */ 
   save_dta = getdta(); 
   setdta(buffer); 

   /* write new records */ 
   blk.fcb_recsize = 256; 
   blk.fcb_random = 0L; 
   result = randbwr(&blk, 1); 

   if (!result) 
      printf("Write OK\n"); 
   else 
   { 
      perror("Disk error"); 
      exit(1); 
   } 

   /* request DOS services to close the file */ 
   if (bdosptr(0x10, &blk, 0) == -1) 
   { 
      perror("Error closing file"); 
      exit(1); 
   } 

   /* reset the old dta */ 
   setdta(save_dta); 

   return 0; 
}