CreateFile打开物理磁盘失败,失败返回代码87,为什么呢?

[erqerq126]

#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
int main() {
	HANDLE hFile=CreateFile("\\\\.\\PhysicalDrive0",GENERIC_READ,
		FILE_SHARE_READ,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
	if(INVALID_HANDLE_VALUE==hFile){
		printf("open error %d\n",GetLastError());
	}
    return 0;
}

运行输出:
open error 87
Press any key to continue

[fishion]

#include <windows.h>
#include <stdio.h>
int main()
{
HANDLE hFile=CreateFile("\\\\.\\PhysicalDrive0", // drive to open
0, // no access to the drive
FILE_SHARE_READ | // share mode
FILE_SHARE_WRITE,
NULL, // default security attributes
OPEN_EXISTING, // disposition
0, // file attributes
NULL);
if(INVALID_HANDLE_VALUE==hFile){
printf("open error %d\n",GetLastError());
}
return 0;

MSDN上面有

[erqerq126]

[Quote=引用 1 楼 fishion 的回复:]
#include <windows.h>
#include <stdio.h>
int main()
{
HANDLE hFile=CreateFile("\\\\.\\PhysicalDrive0", // drive to open
0, // no access to the drive
FILE_SHARE_READ | // share mode
FILE……
[/Quote]
高人，为什么第二个参数必须是:
0, // no access to the drive

而不能是GENERIC_READ呢? 我在MSDN里面没有找到这个读写PhsicalDrive0的例子啊，使哪个api的例子?
谢谢！

[erqerq126]

我打开物理磁盘就是想读出前导区当中的内容
MSDN的解释
0 Specifies device query access to the object. An application can query device attributes without accessing the device.

这个0参数只能读取设备属性，不能用于读啊。要读的话，岂不是还是要用GENERIC_READ参数呢

[fishion]

MSDN中CreateFile下面的标题为“Physical Disks and Volumes”里面就有例子了

[erqerq126]

[Quote=引用 4 楼 fishion 的回复:]
MSDN中CreateFile下面的标题为“Physical Disks and Volumes”里面就有例子了
[/Quote]

谢谢，但是接下来用ReadFile的话，什么也读不出来

#include <windows.h>
#include <stdio.h>
int main() {
  HANDLE hFile=CreateFile("\\\\.\\PhysicalDrive0", // drive to open
  0, // no access to the drive
  FILE_SHARE_READ | // share mode
  FILE_SHARE_WRITE,  
  NULL, // default security attributes
  OPEN_EXISTING, // disposition
  0, // file attributes
  NULL);  
  if(INVALID_HANDLE_VALUE==hFile){
	printf("open error %d\n",GetLastError());
  }
  char buf[256];
  DWORD nread;
  ReadFile(hFile,buf,255,&nread,NULL);
  return 0;//GENERIC_READ
}

用debug运行到return 0的时候，buf的内容全都是0xcccccccc这样的内容，似乎什么也读不到啊
这是怎么回事呢?

谢谢!

[fishion]

You can use the CreateFile function to open a physical disk drive or a volume. The function returns a handle that can be used with the DeviceIoControl function. This enables you to access the disk partition table. However, it is potentially dangerous to do so, because an incorrect write to a disk could make its contents inaccessible. The following requirements must be met for such a call to succeed:

应该不能用ReadFile了，要用DeviceIoControl