windows的磁盘操作之三——获取和删除磁盘分区信息

水深无声 2022-05-10 12:26 417阅读 0赞

转载自：[http://blog.51cto.com/cutebunny/624079][http_blog.51cto.com_cutebunny_624079]

上一节中介绍了如何初始化一块空白的磁盘，并创建分区。那么对于一块已存在分区的磁盘，我们如何获得其分区信息，如何删除其分区信息呢？本节对这两类操作进行讨论。

获得磁盘分区信息的代码如下。

/\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\* Function: get the disk's drive layout infomation

\* input: disk, disk name

\* output: drive layout info

\* return: Succeed, 0

\*         Fail, -1

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*/

DWORD GetDiskDriveLayout(const CHAR \*disk, DRIVE\_LAYOUT\_INFORMATION\_EX \*driveLayout)

HANDLE hDevice;               // handle to the drive to be examined

BOOL result;                  // results flag

DWORD readed;                 // discard results

hDevice = CreateFile(

disk, // drive to open

GENERIC\_READ | GENERIC\_WRITE,     // access to the drive

FILE\_SHARE\_READ | FILE\_SHARE\_WRITE, //share mode

NULL,             // default security attributes

OPEN\_EXISTING,    // disposition

0,                // file attributes

NULL            // do not copy file attribute

);

if (hDevice == INVALID\_HANDLE\_VALUE) // cannot open the drive

fprintf(stderr, "CreateFile() Error: %ld\\n", GetLastError());

return DWORD(-1);

result = DeviceIoControl(

hDevice,               // handle to device

IOCTL\_DISK\_GET\_DRIVE\_LAYOUT\_EX, // dwIoControlCode

NULL,                           // lpInBuffer

0,                              // nInBufferSize

driveLayout,           // output buffer

sizeof(\*driveLayout),         // size of output buffer

&readed,      // number of bytes returned

NULL     // OVERLAPPED structure

);

if (!result)

fprintf(stderr, "IOCTL\_DISK\_GET\_DRIVE\_LAYOUT\_EX Error: %ld\\n", GetLastError());

(void)CloseHandle(hDevice);

return DWORD(-1);

(void)CloseHandle(hDevice);

return 0;

如果你已对上一节中创建分区的代码[http://cutebunny.blog.51cto.com/301216/624052][http_cutebunny.blog.51cto.com_301216_624052] 有了比较深刻的了解，那么这段代码就非常简单了。程序执行流程为：

1． 根据disk名称调用CreateFile打开设备句柄。

2． 调用操作码为IOCTL\_DISK\_GET\_DRIVE\_LAYOUT\_EX的DeviceIoControl函数获取分区信息。返回的信息存储在DRIVE\_LAYOUT\_INFORMATION\_EX \*driveLayout中。本例中我们只考虑了一个分区的情况，如果有多个分区，适当调整DeviceIoControl函数中的nOutBufferSize参数即可。

3． 解析\*driveLayout即可获得分区信息。

删除磁盘分区信息的代码如下，

/\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

\* Function: delete the partition layout of the disk

\* input: disk, disk name

\* output: N/A

\* return: Succeed, 0

\*         Fail, -1

\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*/

DWORD DestroyDisk(DWORD disk)

HANDLE hDevice;               // handle to the drive to be examined

BOOL result;                  // results flag

DWORD readed;                 // discard results

CHAR diskPath\[DISK\_PATH\_LEN\];

sprintf(diskPath, "\\\\\\\\.\\\\PhysicalDrive%d", disk);

hDevice = CreateFile(

diskPath, // drive to open

GENERIC\_READ | GENERIC\_WRITE,     // access to the drive

FILE\_SHARE\_READ | FILE\_SHARE\_WRITE, //share mode

NULL,             // default security attributes

OPEN\_EXISTING,    // disposition

0,                // file attributes

NULL            // do not copy file attribute

);

if (hDevice == INVALID\_HANDLE\_VALUE) // cannot open the drive

fprintf(stderr, "CreateFile() Error: %ld\\n", GetLastError());

return DWORD(-1);

result = DeviceIoControl(

hDevice,               // handle to device

IOCTL\_DISK\_DELETE\_DRIVE\_LAYOUT, // dwIoControlCode

NULL,                           // lpInBuffer

0,                              // nInBufferSize

NULL,                           // lpOutBuffer

0,                              // nOutBufferSize

&readed,      // number of bytes returned

NULL        // OVERLAPPED structure

);

if (!result)

//fprintf(stderr, "IOCTL\_DISK\_DELETE\_DRIVE\_LAYOUT Error: %ld\\n", GetLastError());

(void)CloseHandle(hDevice);

return DWORD(-1);

//fresh the partition table

result = DeviceIoControl(

hDevice,

IOCTL\_DISK\_UPDATE\_PROPERTIES,

NULL,

&readed,

NULL

);

if (!result)

fprintf(stderr, "IOCTL\_DISK\_UPDATE\_PROPERTIES Error: %ld\\n", GetLastError());

(void)CloseHandle(hDevice);

return DWORD(-1);

(void)CloseHandle(hDevice);

return 0;

参数DWORD disk为物理驱动器号。函数执行流程为：

1． 根据驱动器号生成设备名称。

2． 调用CreateFile打开设备并获得设备句柄。

3． 调用操作码为IOCTL\_DISK\_DELETE\_DRIVE\_LAYOUT的DeviceIoControl函数删除分区表。

4． 刷新分区表。

调用DestroyDisk后的磁盘在windows磁盘管理中的状态为

[![200821968.jpg][]][200821968.jpg]

[http_blog.51cto.com_cutebunny_624079]: http://blog.51cto.com/cutebunny/624079
[http_cutebunny.blog.51cto.com_301216_624052]: http://cutebunny.blog.51cto.com/301216/624052
[200821968.jpg]: /images/20220505/db09afee4dd24a6b910836dea05b705e.png