好东西啊

多谢关注啊：

刚刚把 写的 功能也加进去了， 合并在一起。
（已经过测试，改了几个BUG,目前还没发现新BUG，
谁发现了，贴出来）

读写硬盘（和软盘）绝对扇区的函数：
“dolba.h”

#include <bios.h>
#include <io.h>
#include <conio.h>
#include <stdio.h>

void doFile(unsigned int cmd, char *doMode, unsigned char *buffer, unsigned int sector, char *filename, unsigned long sectorDone)
{
FILE *f;
long move=sectorDone*512;
if((f=fopen(filename,doMode))==NULL)
{
printf("File Error\n");
return;
}

if(cmd==2)
fwrite(buffer,512,sector,f);
else if(cmd==3)
{
fseek(f,move,0);
fread(buffer,512,sector,f);
}

fclose(f);

}

void doLBA(unsigned int cmd,
unsigned int hardDisk,
unsigned long startSector,
unsigned long nSectorVar,
char *filename)
{
unsigned int head=0;
unsigned int cylinder=0;
unsigned int sector=0;
unsigned char pBuffer[32256];
FILE *f;
unsigned int allowednSector=0;
unsigned int doReadSector=0;
unsigned long sectorWrite=0;
unsigned int x=0,y=0;

unsigned long nSector=nSectorVar;

long filesize;
FILE *checkFile;

x=wherex();
y=wherey();

//printf("%lu,%lu\n",startSector,nSectorVar);
cylinder=((startSector+nSector-1)/(255*63));
if(cylinder>1022)
{
printf("\n%u out of hard disk's cylinder range(0-1022)\n",cylinder);
return;
}

if(cmd==2)
{
if((f=fopen(filename,"wb+"))==NULL)
{
printf("File Error\n");
return;
}
fclose(f);
}

else if(cmd==3)
{
checkFile=fopen(filename,"rb");
filesize=filelength(fileno(checkFile));
fclose(checkFile);
if((filesize==0) || (filesize % 512)!=0)
{printf("the size of the file is 0 or not an integer in sectors!\n");
return;
}
else nSector=filesize/512;
}

cylinder=startSector/(255*63);
head=(startSector/63)%255;
sector=startSector%63+1;

allowednSector=63-sector+1;

if(nSector<=allowednSector)
doReadSector=nSector;

else doReadSector= allowednSector;

while(sectorWrite<nSector)
{
if(bioskey(1)!=0)
{
if(bioskey(0)==0x11B)
{
printf("\nStopped.\n");
return;
}
}

if(cylinder>1022)
{printf("\nout of hard disk's cylinder range(0-1022)\n");
return;}

if(cmd==2)
{
biosdisk(cmd,hardDisk,head,cylinder,sector,doReadSector,pBuffer);
doFile(2,"ab+",pBuffer,doReadSector,filename,0);
}

else if(cmd==3)
{
doFile(3,"rb",pBuffer,doReadSector,filename,sectorWrite);
biosdisk(cmd,hardDisk,head,cylinder,sector,doReadSector,pBuffer);
}

sectorWrite+= doReadSector;
gotoxy(x,y);
cprintf("%lu%c sectors done.",sectorWrite*100/nSector,'%');

head++;sector=1;

if (head>254) {cylinder++; head=0; sector=1;}
//if (cylinder>1022)
//{printf("\nout of hard disk's cylinder range(0-1022)\n");
//return;}
doReadSector=63;
if(nSector-sectorWrite<63) doReadSector=nSector-sectorWrite;

}
printf("\nDone.");
}

调用示例：
dolba.c
×××××××××××××××××××××××××××
#include ”dolba.h“
#include <stdlib.h>
void main(int argc, char *argv[])
{
unsigned int cmd;
unsigned int hardDisk;
unsigned long startLBASector;
unsigned long sectorToDo;
char *filename,*endptr1,*endptr2;

if(argc!=6)
{
printf("SYNTAX: \nEXE cmd hardDisk startLBASector sectorToDo filename\n");
return;
}

cmd=atoi(argv[1]);
hardDisk=atoi(argv[2]);
//reservedSector=atol(argv[3]);
// sectorPerFAT=atol(argv[4]);
startLBASector=strtoul(argv[3],NULL,10);
sectorToDo=strtoul(argv[4],NULL,10);

filename=argv[5];

//printf("%s,%lu,%c\n%s,%lu,%c\n",argv[3],startLBASector,*endptr1,argv[4],sectorToDo,*endptr2);
/* getFATinfo(0x80,&reservedSector,&sectorPerFAT); */
doLBA(cmd,hardDisk,startLBASector,sectorToDo,filename);
}


运行：
dolba 2 128 100 200 file //从硬盘1 的100扇区处读200扇区到文件
dolba 3 128 100 200 file //把文件写到硬盘1 的100扇区处200扇区

[此贴子已经被作者于2006-6-30 2:08:08编辑过]

用C语言调用扩展13中断，读写大硬盘已解决拉！
主要代码如下：（测试正确）

#include <dos.h>
#include <stdio.h>
void main(){
unsigned char buf[51200];
FILE *f;
union REGS in,out;
struct DiskAddressPacket
{
unsigned char PacketSize; /* 数据包尺寸(16字节) */
unsigned char Reserved; /* ==0 */
unsigned int BlockCount; /* 要传输的数据块个数(以扇区为单位) */
unsigned long BufferAddr;/* 传输缓冲地址(segment:offset) */
unsigned long BlockNum;/* 磁盘起始绝对块地址 */
/*unsigned long ab; */
}dap={16,0,100,0,16434495};
dap.BufferAddr=(unsigned long)buf;

in.h.ah = 0x42;
in.h.dl = 0x80;
in.x.si = &dap;
/*磁盘地址数据包(Disk Address Packet) */

int86(0x13,&in,&out);

f=fopen("int13ext.dat","wb+");
fwrite(buf,512,100,f);
fclose(f);
}

[此贴子已经被作者于2006-6-30 20:23:05编辑过]

看完程序了，没有摸着头脑！