SharpDisplayManager: SharpLibEar/ActionOpticalDriveEject.cs@cc2251d065db

     1 using Microsoft.Win32.SafeHandles;

     2 using System;

     3 using System.Collections.Generic;

     4 using System.Diagnostics;

     5 using System.IO;

     6 using System.Linq;

     7 using System.Runtime.Serialization;

     8 using System.Text;

     9 using System.Threading.Tasks;

    10 using SharpLib.Win32;

    11 using System.ComponentModel;

    12 using System.Runtime.InteropServices;

    14 namespace SharpLib.Ear

    15 {

    16     [DataContract]

    17     [AttributeObject(Id = "Action.OpticalDrive.Eject", Name = "Eject", Description = "Eject media from an optical drive.")]

    18     public class ActionOpticalDriveEject : Action

    19     {

    20         [DataMember]

    21         [AttributeObjectProperty

    22             (

    23             Id = "Action.OpticalDrive.Eject.Drive",

    24             Name = "Drive to eject",

    25             Description = "Select the drive you want to eject."

    26             )

    27         ]

    28         public PropertyComboBox Drive { get; set; } = new PropertyComboBox();

    31         protected override void DoConstruct()

    32         {

    33             base.DoConstruct();

    34             PopulateOpticalDrives();

    35             CheckCurrentItem();

    36         }

    39         public override string Brief()

    40         {

    41             return Name + " " + Drive.CurrentItem ;

    42         }

    44         public override bool IsValid()

    45         {

    46             //This object is valid if our current item is contained in our drive list

    47             return Drive.Items.Contains(Drive.CurrentItem);

    48         }

    50         protected override void DoExecute()

    51         {

    52             DriveEject(Drive.CurrentItem);

    53         }

    56         private void CheckCurrentItem()

    57         {

    58             if (!Drive.Items.Contains(Drive.CurrentItem) && Drive.Items.Count>0)

    59             {

    60                 //Current item unknown, reset it then

    61                 Drive.CurrentItem = Drive.Items[0];

    62             }

    63         }

    65         /// <summary>

    66         ///

    67         /// </summary>

    68         private void PopulateOpticalDrives()

    69         {

    70             //Reset our list of drives

    71             Drive.Items = new List<string>();

    72             //Go through each drives on our system and collected the optical ones in our list

    73             DriveInfo[] allDrives = DriveInfo.GetDrives();

    74             foreach (DriveInfo d in allDrives)

    75             {

    76                 Debug.WriteLine("Drive " + d.Name);

    77                 Debug.WriteLine("  Drive type: {0}", d.DriveType);

    79                 if (d.DriveType == DriveType.CDRom)

    80                 {

    81                     //This is an optical drive, add it now

    82                     Drive.Items.Add(d.Name.Substring(0, 2));

    83                 }

    84             }

    85         }

    88         /// <summary>

    89         ///

    90         /// </summary>

    91         /// <param name="aPrefix"></param>

    92         static private void CheckLastError(string aPrefix)

    93         {

    94             string errorMessage = new Win32Exception(Marshal.GetLastWin32Error()).Message;

    95             Debug.WriteLine(aPrefix + Marshal.GetLastWin32Error().ToString() + ": " + errorMessage);

    96         }

    98         /// <summary>

    99         ///

   100         /// </summary>

   101         /// <param name="data"></param>

   102         /// <returns></returns>

   103         static private IntPtr MarshalToPointer(object data)

   104         {

   105             IntPtr buf = Marshal.AllocHGlobal(

   106                 Marshal.SizeOf(data));

   107             Marshal.StructureToPtr(data,

   108                 buf, false);

   109             return buf;

   110         }

   112         /// <summary>

   113         ///

   114         /// </summary>

   115         /// <returns></returns>

   116         static private SafeFileHandle OpenVolume(string aDriveName)

   117         {

   118             return Function.CreateFile("\\\\.\\" + aDriveName,

   119                                SharpLib.Win32.FileAccess.GENERIC_READ,

   120                                SharpLib.Win32.FileShare.FILE_SHARE_READ | SharpLib.Win32.FileShare.FILE_SHARE_WRITE,

   121                                IntPtr.Zero,

   122                                CreationDisposition.OPEN_EXISTING,

   123                                0,

   124                                IntPtr.Zero);

   125         }

   127         /// <summary>

   128         ///

   129         /// </summary>

   130         /// <param name="aVolume"></param>

   131         /// <returns></returns>

   132         static private bool LockVolume(SafeFileHandle aVolume)

   133         {

   134             //Hope that's doing what I think it does

   135             IntPtr dwBytesReturned = new IntPtr();

   136             //Should not be needed but I'm not sure how to pass NULL in there.

   137             OVERLAPPED overlapped = new OVERLAPPED();

   139             int tries = 0;

   140             const int KMaxTries = 100;

   141             const int KSleepTime = 10;

   142             bool success = false;

   144             while (!success && tries < KMaxTries)

   145             {

   146                 success = Function.DeviceIoControl(aVolume, Const.FSCTL_LOCK_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, dwBytesReturned, ref overlapped);

   147                 System.Threading.Thread.Sleep(KSleepTime);

   148                 tries++;

   149             }

   151             CheckLastError("Lock volume: ");

   153             return success;

   154         }

   156         /// <summary>

   157         ///

   158         /// </summary>

   159         /// <param name="aVolume"></param>

   160         /// <returns></returns>

   161         static private bool DismountVolume(SafeFileHandle aVolume)

   162         {

   163             //Hope that's doing what I think it does

   164             IntPtr dwBytesReturned = new IntPtr();

   165             //Should not be needed but I'm not sure how to pass NULL in there.

   166             OVERLAPPED overlapped = new OVERLAPPED();

   168             bool res = Function.DeviceIoControl(aVolume, Const.FSCTL_DISMOUNT_VOLUME, IntPtr.Zero, 0, IntPtr.Zero, 0, dwBytesReturned, ref overlapped);

   169             CheckLastError("Dismount volume: ");

   170             return res;

   171         }

   175         /// <summary>

   176         ///

   177         /// </summary>

   178         /// <param name="aVolume"></param>

   179         /// <param name="aPreventRemoval"></param>

   180         /// <returns></returns>

   181         static private bool PreventRemovalOfVolume(SafeFileHandle aVolume, bool aPreventRemoval)

   182         {

   183             //Hope that's doing what I think it does

   184             IntPtr dwBytesReturned = new IntPtr();

   185             //Should not be needed but I'm not sure how to pass NULL in there.

   186             OVERLAPPED overlapped = new OVERLAPPED();

   187             //

   188             PREVENT_MEDIA_REMOVAL preventMediaRemoval = new PREVENT_MEDIA_REMOVAL();

   189             preventMediaRemoval.PreventMediaRemoval = Convert.ToByte(aPreventRemoval);

   190             IntPtr preventMediaRemovalParam = MarshalToPointer(preventMediaRemoval);

   192             bool result = Function.DeviceIoControl(aVolume, Const.IOCTL_STORAGE_MEDIA_REMOVAL, preventMediaRemovalParam, Convert.ToUInt32(Marshal.SizeOf(preventMediaRemoval)), IntPtr.Zero, 0, dwBytesReturned, ref overlapped);

   193             CheckLastError("Media removal: ");

   194             Marshal.FreeHGlobal(preventMediaRemovalParam);

   196             return result;

   197         }

   199         /// <summary>

   200         /// Eject optical drive media opening the tray if any.

   201         /// </summary>

   202         /// <param name="aVolume"></param>

   203         /// <returns></returns>

   204         static private bool MediaEject(SafeFileHandle aVolume)

   205         {

   206             //Hope that's doing what I think it does

   207             IntPtr dwBytesReturned = new IntPtr();

   208             //Should not be needed but I'm not sure how to pass NULL in there.

   209             OVERLAPPED overlapped = new OVERLAPPED();

   211             bool res = Function.DeviceIoControl(aVolume, Const.IOCTL_STORAGE_EJECT_MEDIA, IntPtr.Zero, 0, IntPtr.Zero, 0, dwBytesReturned, ref overlapped);

   212             CheckLastError("Media eject: ");

   213             return res;

   214         }

   216         /// <summary>

   217         /// Close an optical drive tray.

   218         /// </summary>

   219         /// <param name="aVolume"></param>

   220         /// <returns></returns>

   221         static private bool MediaLoad(SafeFileHandle aVolume)

   222         {

   223             //Hope that's doing what I think it does

   224             IntPtr dwBytesReturned = new IntPtr();

   225             //Should not be needed but I'm not sure how to pass NULL in there.

   226             OVERLAPPED overlapped = new OVERLAPPED();

   228             bool res = Function.DeviceIoControl(aVolume, Const.IOCTL_STORAGE_LOAD_MEDIA, IntPtr.Zero, 0, IntPtr.Zero, 0, dwBytesReturned, ref overlapped);

   229             CheckLastError("Media load: ");

   230             return res;

   231         }

   233         /// <summary>

   234         ///

   235         /// </summary>

   236         /// <param name="aVolume"></param>

   237         /// <returns></returns>

   238         static private bool StorageCheckVerify(SafeFileHandle aVolume)

   239         {

   240             //Hope that's doing what I think it does

   241             IntPtr dwBytesReturned = new IntPtr();

   242             //Should not be needed but I'm not sure how to pass NULL in there.

   243             OVERLAPPED overlapped = new OVERLAPPED();

   245             bool res = Function.DeviceIoControl(aVolume, Const.IOCTL_STORAGE_CHECK_VERIFY2, IntPtr.Zero, 0, IntPtr.Zero, 0, dwBytesReturned, ref overlapped);

   247             CheckLastError("Check verify: ");

   249             return res;

   250         }

   253         /// <summary>

   254         /// Perform media ejection.

   255         /// </summary>

   256         static private void DriveEject(string aDrive)

   257         {

   258             string drive = aDrive;

   259             if (drive.Length != 2)

   260             {

   261                 //Not a proper drive spec.

   262                 //Probably 'None' selected.

   263                 return;

   264             }

   266             SafeFileHandle handle = OpenVolume(drive);

   267             if (handle.IsInvalid)

   268             {

   269                 CheckLastError("ERROR: Failed to open volume: ");

   270                 return;

   271             }

   273             if (LockVolume(handle) && DismountVolume(handle))

   274             {

   275                 Debug.WriteLine("Volume was dismounted.");

   277                 if (PreventRemovalOfVolume(handle, false))

   278                 {

   279                     //StorageCheckVerify(handle);

   281                     DateTime before;

   282                     before = DateTime.Now;

   283                     bool ejectSuccess = MediaEject(handle);

   284                     double ms = (DateTime.Now - before).TotalMilliseconds;

   286                     //We assume that if it take more than a certain time to for eject to execute it means we actually ejected.

   287                     //If our eject completes too rapidly we assume the tray is already open and we will try to close it.

   288                     if (ejectSuccess && ms > 100)

   289                     {

   290                         Debug.WriteLine("Media was ejected");

   291                     }

   292                     else if (MediaLoad(handle))

   293                     {

   294                         Debug.WriteLine("Media was loaded");

   295                     }

   296                 }

   297             }

   298             else

   299             {

   300                 Debug.WriteLine("Volume lock or dismount failed.");

   301             }

   303             //This is needed to make sure we can open the volume next time around

   304             handle.Dispose();

   305         }

   307     }

   308 }

author	Stephane Lenclud
	Fri, 19 Aug 2016 17:12:54 +0200
changeset 243	cc2251d065db
parent 240	5c4f1e2bf29a
child 258	e237c2e33545
permissions	-rw-r--r--