Question

我想使用下面的代码打印引导扇区，但是有错误。

#include <windows.h>
#include <stdio.h>
#include <iostream>
#include <math.h>


using namespace std;
short ReadSect
   (const char * _dsk,    // disk to access
   char *&_buff,         // buffer where sector will be stored
   unsigned int _nsect   // sector number, starting with 0
   )
{ 
DWORD dwRead;   
HANDLE 
hDisk=CreateFile(_dsk,GENERIC_READ,FILE_SHARE_READ,0,OPEN_EXISTING,0,0);
if(hDisk==INVALID_HANDLE_VALUE) // this may happen if another program is 
already reading from disk
{  
   CloseHandle(hDisk);
   return 1;
}
SetFilePointer(hDisk,_nsect*512,0,FILE_BEGIN); // which sector to read

ReadFile(hDisk,_buff,512,&dwRead,0);  // read sector
CloseHandle(hDisk);
return 0;
}

int main()
{
char * drv="\\\\.\\C:";
char *dsk=" \\\\.\\PhysicalDrive0";
int sector=0;
int b = 1;

char *buff=new char[512];
ReadSect(dsk,buff,sector);
if((unsigned char)buff[510]==0x55 && (unsigned char)buff[511]==0xaa) cout 
<<"Disk is bootable!"<<endl;
else printf("%02hhX\n",(unsigned int)(unsigned char)buff[511]);

printf("\n");
while (b<513)
{
  if (b%16==0)
     printf(" %02hhX\n",(unsigned int)(unsigned char)buff[b-1]);

  else
     printf (" %02hhX ",(unsigned int)(unsigned char)buff[b-1]);
  b++;
}
getchar(); 
}

而不是打印引导扇区的十六进制数字，microsoft visual studio打印出“CD”流。错误是什么以及如何解决问题？有人可以帮忙吗？

Photo of output

Answer 1

首先，以管理员身份启动它

从

中删除空格

char *dsk=" \\\\.\\PhysicalDrive0";

必须是

char *dsk="\\\\.\\PhysicalDrive0";

并且，如果您使用char * dsk，请在：

进行修改

HDISK =的CreateFile（_dsk，GENERIC_READ，FILE_SHARE_READ，0，OPEN_EXISTING，0,0）;

必须是： CreateFileA（......）

#include <windows.h>
#include <stdio.h>
#include <iostream>
#include <math.h>


using namespace std;
short ReadSect
(const char * _dsk,    // disk to access
    char *&_buff,         // buffer where sector will be stored
    unsigned int _nsect   // sector number, starting with 0
)
{
    DWORD dwRead;
    HANDLE
        hDisk = CreateFileA( _dsk, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, 0);
    //CreateFile()
    if (hDisk == INVALID_HANDLE_VALUE) // this may happen if another program is already reading from disk
    {
        CloseHandle(hDisk);
    return 1;
    }
    SetFilePointer(hDisk, _nsect * 512, 0, FILE_BEGIN); // which sector to read

    ReadFile(hDisk, _buff, 512, &dwRead, 0);  // read sector
    CloseHandle(hDisk);
    return 0;
}

int main()
{
    char * drv = "\\\\.\\C:";
    char *dsk = "\\\\.\\PhysicalDrive0";
    int sector = 0;
    int b = 1;

    char *buff = new char[512];
    ReadSect(dsk, buff, sector);
    if ((unsigned char)buff[510] == 0x55 && (unsigned char)buff[511] == 0xaa) cout
        << "Disk is bootable!" << endl;
    else printf("%02hhX\n", (unsigned int)(unsigned char)buff[511]);

    printf("\n");
    while (b<513)
    {
        if (b % 16 == 0)
            printf(" %02hhX\n", (unsigned int)(unsigned char)buff[b - 1]);

        else
            printf(" %02hhX ", (unsigned int)(unsigned char)buff[b - 1]);
        b++;
    }
    getchar();
}

WinAPI Unicode and ANSI functions

直接访问硬盘

1 个答案: