改后可读软盘扇区
出错信息：应用程序试着直接访问硬盘，但仍无法支持。
据说可用win api函数直接实现，但我不知道是什么函数。
#include<stdio.h>
#include<stdlib.h>
#include<dos.h>
#include<ctype.h>
const int num=512;
int Maxnum;
FILE *fp;
unsigned char *buf;
void ReadDisk(int nsects,int isect)/*nsects:要读的扇区数；isect：其实逻辑扇区号。*/
{
unsigned int i,j;
/*absread(drive,number of sects to read,start sect number,buf)*/
/*use INT 25h,Read disk sects! */
absread(2,nsects,isect,buf);
/*将结果写入文件*/
for(i=0;i<Maxnum;i+=16)
{
/*for(j),print by ascii */
for(j=0;j<16;j++)
{
fprintf(fp,"%02x",buf[i+j]);
fprintf(fp," ");
}
fprintf(fp," ");
/*for(j),print by char*/
for(j=0;j<16;j++)
{
if(isprint(buf[i+j]))
fprintf(fp,"%c",buf[i+j]);
else
fprintf(fp,".");
}
fprintf(fp,"\n");
}/*End for(i)*/
}/*readdisk()*/
int main()
{
char p[512],ch;
int k;
fp=fopen("out.txt","w+"); /*Creat file "out.txt" and write in.*/
if(fp==0)
{
printf("File open error!");
exit(0);
}
fprintf(fp,"\n/*--------------------------Boot引导纪录----------------------------*/\n\n");
/*Boot引导纪录: One sect!*/
Maxnum=num;
buf=malloc(Maxnum);
ReadDisk(1,0);
return 0;
}/*main()*/
