windows的磁盘操作之三——获取和删除磁盘分区信息

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