根据代码,如何在不唤醒硬盘驱动器的情况下测试硬盘驱动器是否处于休眠状态

C++解决方案(调用GETDISKPOWSTATE,它将迭代物理驱动器,直到没有更多):

class AutoHandle
{
    HANDLE  mHandle;
public:
    AutoHandle() : mHandle(NULL) { }
    AutoHandle(HANDLE h) : mHandle(h) { }

    HANDLE * operator & ()
    {
        return &mHandle;
    }

    operator HANDLE() const
    {
        return mHandle;
    }

    ~AutoHandle()
    {
        if (mHandle && mHandle != INVALID_HANDLE_VALUE)
            ::CloseHandle(mHandle);
    }
};


bool
GetDiskPowerState(LPCTSTR disk, string & txt)
{
    AutoHandle hFile = CreateFile(disk, 0, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
    if (hFile && hFile != INVALID_HANDLE_VALUE)
    {
        BOOL powerState = FALSE;
        const BOOL result = GetDevicePowerState(hFile, &powerState);
        const DWORD err = GetLastError();

        if (result)
        {
            if (powerState)
            {
                txt += disk;
                txt += " : powered up\r\n";
            }
            else
            {
                txt += disk;
                txt += " : sleeping\r\n";
            }
            return true;
        }
        else
        {
            txt += "Cannot get drive ";
            txt += disk;
            txt += "status\r\n";
            return false;
        }
    }

    return false;
}

string 
GetDiskPowerState()
{
    string text;
    CString driveName;
    bool result = true;
    for (int idx= 0; result; idx++)
    {
        driveName.Format("\\\\.\\PhysicalDrive%d", idx);
        result = GetDiskPowerState(driveName, text);
    }
    return text;
}

在C#中(从 http://msdn.microsoft.com/en-us/library/ms704147.aspx )

// Get the power state of a harddisk
string ReportDiskStatus()
{
    string status = string.Empty;
    bool fOn = false;

    Assembly assembly = Assembly.GetExecutingAssembly();
    FileStream[] files = assembly.GetFiles();
    if (files.Length > 0)
    {
        IntPtr hFile = files[0].Handle;
        bool result = GetDevicePowerState(hFile, out fOn);
        if (result)
        {
            if (fOn)
            {
                status = "Disk is powered up and spinning";
            }
            else
            {
                status = "Disk is sleeping";
            }
        }
        else
        {
            status = "Cannot get Disk Status";
        }
        Console.WriteLine(status);
    }
    return status;
}