windows的磁碟操作之三——擷取和刪除磁碟分割資訊

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上一節中介紹了如何初始化一塊空白的磁碟，並建立分區。那麼對於一塊已存在分區的磁碟，我們如何獲得其分區資訊，如何刪除其分區資訊呢？本節對這兩類操作進行討論。

 獲得磁碟分割資訊的代碼如下。/******************************************************************************* 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;} 如果你已對上一節中建立分區的代碼http://cutebunny.blog.51cto.com/301216/624052 有了比較深刻的瞭解，那麼這段代碼就非常簡單了。程式執行流程為：1． 根據disk名稱調用CreateFile開啟裝置控制代碼。2． 叫用作業碼為IOCTL_DISK_GET_DRIVE_LAYOUT_EX的DeviceIoControl函數擷取分區資訊。返回的資訊儲存在DRIVE_LAYOUT_INFORMATION_EX
*driveLayout中。本例中我們只考慮了一個分區的情況，如果有多個分區，適當調整DeviceIoControl函數中的nOutBufferSize參數即可。3． 解析*driveLayout即可獲得分區資訊。 刪除磁碟分割資訊的代碼如下，/******************************************************************************* 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,                0,                NULL,                0,                &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;} 參數DWORD disk為物理磁碟機代號。函數執行流程為：1． 根據磁碟機代號產生裝置名稱。2． 調用CreateFile開啟裝置並獲得裝置控制代碼。3． 叫用作業碼為IOCTL_DISK_DELETE_DRIVE_LAYOUT的DeviceIoControl函數刪除分區表。4． 重新整理分區表。調用DestroyDisk後的磁碟在windows磁碟管理中的狀態為

 

 

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