namespace ConsoleApplication
{
using System;
using Microshaoft;
public class Class1
{
static void Main(string[] args)
{
DriveDetector x = new DriveDetector();
x.DeviceArrived += new DriveDetector.DriveDetectorEventHandler(x_DeviceArrived);
x.DeviceRemoved += new DriveDetector.DriveDetectorEventHandler(x_DeviceRemoved);
Console.WriteLine("Hello World");
Console.WriteLine(Environment.Version.ToString());
Console.ReadLine();
}
static void x_DeviceRemoved(DriveDetector sender, DriveDetectorEventArgs e)
{
Console.WriteLine("DeviceRemoved {0}", e.Drive);
}
static void x_DeviceArrived(DriveDetector sender, DriveDetectorEventArgs e)
{
Console.WriteLine("DeviceArrived {0}", e.Drive);
}
}
}
namespace Microshaoft
{
using System;
using System.Windows.Forms; // required for Message
using System.Runtime.InteropServices; // required for Marshal
using System.IO;
using Microsoft.Win32.SafeHandles;
using System.Threading;
public class DriveDetectorEventArgs : EventArgs
{
public DriveDetectorEventArgs()
{
Cancel = false;
Drive = "";
HookQueryRemove = false;
}
public bool Cancel;
public string Drive;
public bool HookQueryRemove;
}
public class DriveDetector : IDisposable
{
public event DriveDetectorEventHandler DeviceArrived;
public event DriveDetectorEventHandler DeviceRemoved;
public event DriveDetectorEventHandler QueryRemove;
public delegate void DriveDetectorEventHandler(DriveDetector sender, DriveDetectorEventArgs e);
private WindowsMessagesListener _listener;// = new WindowsMessagesListener();
private IntPtr _DirHandle = IntPtr.Zero;
private FileStream _FileOnFlash = null;
private string _FileToOpen;
private IntPtr _DeviceNotifyHandle;
private IntPtr _hWnd;
private string _CurrentDrive;
private Thread _thread;
private class WindowsMessagesListener : Form//NativeWindow
{
public delegate void WndProcEventHandler(ref Message m, bool cancel);
public event WndProcEventHandler BeforeBaseWndProc;
public event WndProcEventHandler AfterBaseWndProc;
protected override void WndProc(ref Message m)
{
bool b = false;
if (BeforeBaseWndProc != null)
{
BeforeBaseWndProc(ref m, b);
}
if (!b)
{
base.WndProc(ref m);
if (AfterBaseWndProc != null)
{
AfterBaseWndProc(ref m, b);
}
}
}
}
public DriveDetector()
{
Init(null);
}
public DriveDetector(string FileToOpen)
{
Init(FileToOpen);
}
private void Init(string fileToOpen)
{
_thread = new Thread(new ThreadStart(Run)); //监视线程: 显示滚动计数器
_thread.Start();
_FileToOpen = fileToOpen;
_FileOnFlash = null;
_DeviceNotifyHandle = IntPtr.Zero;
_DirHandle = IntPtr.Zero; // handle to the root directory of the flash drive which we open
_CurrentDrive = "";
}
private void Run()
{
_listener = new WindowsMessagesListener();
_hWnd = _listener.Handle;
_listener.AfterBaseWndProc += new WindowsMessagesListener.WndProcEventHandler(_listener_AfterBaseWndProc);
Application.Run();
}
void _listener_AfterBaseWndProc(ref Message m, bool canceledBaseWndProc)
{
int devType;
char c;
if (m.Msg == Win32Native.WM_DEVICECHANGE)
{
// WM_DEVICECHANGE can have several meanings depending on the WParam value...
switch (m.WParam.ToInt32())
{
//
// New device has just arrived
//
case Win32Native.DBT_DEVICEARRIVAL :
devType = Marshal.ReadInt32(m.LParam, 4);
if (devType == Win32Native.DBT_DEVTYP_VOLUME)
{
DEV_BROADCAST_VOLUME vol;
vol = (DEV_BROADCAST_VOLUME)
Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_VOLUME));
// Get the drive letter
c = DriveMaskToLetter(vol.dbcv_unitmask);
//
// Call the client event handler
//
// We should create copy of the event before testing it and
// calling the delegate - if any
DriveDetectorEventHandler tempDeviceArrived = DeviceArrived;
if (tempDeviceArrived != null)
{
DriveDetectorEventArgs e = new DriveDetectorEventArgs();
e.Drive = c + ":\\";
tempDeviceArrived(this, e);
// Register for query remove if requested
if (e.HookQueryRemove)
{
// If something is already hooked, unhook it now
if (_DeviceNotifyHandle != IntPtr.Zero)
{
RegisterForDeviceChange(false, null);
}
RegisterQuery(c + ":\\");
}
} // if has event handler
}
break;
//
// Device is about to be removed
// Any application can cancel the removal
//
case Win32Native.DBT_DEVICEQUERYREMOVE :
devType = Marshal.ReadInt32(m.LParam, 4);
if (devType == Win32Native.DBT_DEVTYP_HANDLE)
{
// TODO: we could get the handle for which this message is sent
// from vol.dbch_handle and compare it against a list of handles for
// which we have registered the query remove message (?)
//DEV_BROADCAST_HANDLE vol;
//vol = (DEV_BROADCAST_HANDLE)
// Marshal.PtrToStructure(_.LParam, typeof(DEV_BROADCAST_HANDLE));
// if ( vol.dbch_handle ....
//
// Call the event handler in client
//
DriveDetectorEventHandler tempQuery = QueryRemove;
if (tempQuery != null)
{
DriveDetectorEventArgs e = new DriveDetectorEventArgs();
e.Drive = _CurrentDrive; // drive which is hooked
tempQuery(this, e);
// If the client wants to cancel, let Windows know
if (e.Cancel)
{
m.Result = (IntPtr)Win32Native.BROADCAST_QUERY_DENY;
}
else
{
// Change 28.10.2007: Unregister the notification, this will
// close the handle to file or root directory also.
// We have to close it anyway to allow the removal so
// even if some other app cancels the removal we would not know about it...
RegisterForDeviceChange(false, null); // will also close the mFileOnFlash
}
}
}
break;
//
// Device has been removed
//
case Win32Native.DBT_DEVICEREMOVECOMPLETE :
devType = Marshal.ReadInt32(m.LParam, 4);
if (devType == Win32Native.DBT_DEVTYP_VOLUME)
{
devType = Marshal.ReadInt32(m.LParam, 4);
if (devType == Win32Native.DBT_DEVTYP_VOLUME)
{
DEV_BROADCAST_VOLUME vol;
vol = (DEV_BROADCAST_VOLUME)
Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_VOLUME));
c = DriveMaskToLetter(vol.dbcv_unitmask);
//
// Call the client event handler
//
DriveDetectorEventHandler tempDeviceRemoved = DeviceRemoved;
if (tempDeviceRemoved != null)
{
DriveDetectorEventArgs e = new DriveDetectorEventArgs();
e.Drive = c + ":\\";
tempDeviceRemoved(this, e);
}
// TODO: we could unregister the notify handle here if we knew it is the
// right drive which has been just removed
//RegisterForDeviceChange(false, null);
}
}
break;
}
}
}
public bool IsQueryHooked
{
get
{
if (_DeviceNotifyHandle == IntPtr.Zero)
{
return false;
}
else
{
return true;
}
}
}
public string HookedDrive
{
get
{
return _CurrentDrive;
}
}
public FileStream OpenedFile
{
get
{
return _FileOnFlash;
}
}
public bool EnableQueryRemove(string fileOnDrive)
{
if (fileOnDrive == null || fileOnDrive.Length == 0)
{
throw new ArgumentException("Drive path must be supplied to register for Query remove.");
}
if (fileOnDrive.Length == 2 && fileOnDrive[1] == ':')
{
fileOnDrive += '\\'; // append "\\" if only drive letter with ":" was passed in.
}
if (_DeviceNotifyHandle != IntPtr.Zero)
{
// Unregister first...
RegisterForDeviceChange(false, null);
}
if (Path.GetFileName(fileOnDrive).Length == 0 || !File.Exists(fileOnDrive))
{
_FileToOpen = null; // use root directory...
}
else
{
_FileToOpen = fileOnDrive;
}
RegisterQuery(Path.GetPathRoot(fileOnDrive));
if (_DeviceNotifyHandle == IntPtr.Zero)
{
return false; // failed to register
}
return true;
}
public void DisableQueryRemove()
{
if (_DeviceNotifyHandle != IntPtr.Zero)
{
RegisterForDeviceChange(false, null);
}
}
public void Dispose()
{
RegisterForDeviceChange(false, null);
}
private void RegisterQuery(string drive)
{
bool register = true;
if (!String.IsNullOrEmpty(_FileToOpen))
{
// Make sure the path in mFileToOpen contains valid drive
// If there is a drive letter in the path, it may be different from the actual
// letter assigned to the drive now. We will cut it off and merge the actual drive
// with the rest of the path.
if (_FileToOpen.Contains(":"))
{
string tmp = _FileToOpen.Substring(3);
string root = Path.GetPathRoot(drive);
_FileToOpen = Path.Combine(root, tmp);
}
else
{
_FileToOpen = Path.Combine(drive, _FileToOpen);
}
}
try
{
//mFileOnFlash = new FileStream(_FileToOpen, FileMode.Open);
// Change 28.10.2007 - Open the root directory
if (_FileToOpen == null) // open root directory
{
_FileOnFlash = null;
}
else
{
_FileOnFlash = new FileStream(_FileToOpen, FileMode.Open);
}
}
catch (Exception)
{
// just do not register if the file could not be opened
register = false;
}
if (register)
{
//RegisterForDeviceChange(true, mFileOnFlash.SafeFileHandle);
//mCurrentDrive = drive;
// Change 28.10.2007 - Open the root directory
if (_FileOnFlash == null)
{
RegisterForDeviceChange(drive);
}
else
{
// old version
RegisterForDeviceChange(true,_FileOnFlash.SafeFileHandle);
}
_CurrentDrive = drive;
}
}
private void RegisterForDeviceChange(string dirPath)
{
IntPtr handle = Win32Native.OpenDirectory(dirPath);
if (handle == IntPtr.Zero)
{
_DeviceNotifyHandle = IntPtr.Zero;
return;
}
else
_DirHandle = handle; // save handle for closing it when unregistering
// Register for handle
DEV_BROADCAST_HANDLE data = new DEV_BROADCAST_HANDLE();
data.dbch_devicetype = Win32Native.DBT_DEVTYP_HANDLE;
data.dbch_reserved = 0;
data.dbch_nameoffset = 0;
//data.dbch_data = null;
//data.dbch_eventguid = 0;
data.dbch_handle = handle;
data.dbch_hdevnotify = (IntPtr)0;
int size = Marshal.SizeOf(data);
data.dbch_size = size;
IntPtr buffer = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(data, buffer, true);
_DeviceNotifyHandle = Win32Native.RegisterDeviceNotification(_hWnd, buffer, 0);
}
private void RegisterForDeviceChange(bool register, SafeFileHandle fileHandle)
{
if (register)
{
// Register for handle
DEV_BROADCAST_HANDLE data = new DEV_BROADCAST_HANDLE();
data.dbch_devicetype = Win32Native.DBT_DEVTYP_HANDLE;
data.dbch_reserved = 0;
data.dbch_nameoffset = 0;
//data.dbch_data = null;
//data.dbch_eventguid = 0;
data.dbch_handle = fileHandle.DangerousGetHandle(); //Marshal. fileHandle;
data.dbch_hdevnotify = (IntPtr)0;
int size = Marshal.SizeOf(data);
data.dbch_size = size;
IntPtr buffer = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(data, buffer, true);
_DeviceNotifyHandle = Win32Native.RegisterDeviceNotification(_hWnd, buffer, 0);
}
else
{
// close the directory handle
if (_DirHandle != IntPtr.Zero)
{
Win32Native.CloseDirectoryHandle(_DirHandle);
// string er = Marshal.GetLastWin32Error().ToString();
}
// unregister
if (_DeviceNotifyHandle != IntPtr.Zero)
{
Win32Native.UnregisterDeviceNotification(_DeviceNotifyHandle);
}
_DeviceNotifyHandle = IntPtr.Zero;
_DirHandle = IntPtr.Zero;
_CurrentDrive = "";
if (_FileOnFlash != null)
{
_FileOnFlash.Close();
_FileOnFlash = null;
}
}
}
private static char DriveMaskToLetter(int mask)
{
char c;
string drives = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
// 1 = A
// 2 = B
// 4 = C...
int i = 0;
int p = mask / 2;
while (p != 0)
{
p = p / 2;
i ++;
}
if (i < drives.Length)
{
c = drives[i];
}
else
{
c = '?';
}
return c;
}
private class Win32Native
{
// Win32 constants
public const int DBT_DEVTYP_DEVICEINTERFACE = 5;
public const int DBT_DEVTYP_HANDLE = 6;
public const int BROADCAST_QUERY_DENY = 0x424D5144;
public const int WM_DEVICECHANGE = 0x0219;
public const int DBT_DEVICEARRIVAL = 0x8000; // system detected a new device
public const int DBT_DEVICEQUERYREMOVE = 0x8001; // Preparing to remove (any program can disable the removal)
public const int DBT_DEVICEREMOVECOMPLETE = 0x8004; // removed
public const int DBT_DEVTYP_VOLUME = 0x00000002; // drive type is logical volume
// HDEVNOTIFY RegisterDeviceNotification(HANDLE hRecipient,LPVOID NotificationFilter,DWORD Flags);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr RegisterDeviceNotification(IntPtr hRecipient, IntPtr NotificationFilter, uint Flags);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern uint UnregisterDeviceNotification(IntPtr hHandle);
//
// CreateFile - MSDN
const uint GENERIC_READ = 0x80000000;
const uint OPEN_EXISTING = 3;
const uint FILE_SHARE_READ = 0x00000001;
const uint FILE_SHARE_WRITE = 0x00000002;
const uint FILE_ATTRIBUTE_NORMAL = 128;
const uint FILE_FLAG_BACKUP_SEMANTICS = 0x02000000;
static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);
// should be "static extern unsafe"
[DllImport("kernel32", SetLastError = true)]
static extern IntPtr CreateFile
(
string FileName, // file name
uint DesiredAccess, // access mode
uint ShareMode, // share mode
uint SecurityAttributes, // Security Attributes
uint CreationDisposition, // how to create
uint FlagsAndAttributes, // file attributes
int hTemplateFile // handle to template file
);
[DllImport("kernel32", SetLastError = true)]
static extern bool CloseHandle
(
IntPtr hObject // handle to object
);
static public IntPtr OpenDirectory(string dirPath)
{
// open the existing file for reading
IntPtr handle = CreateFile
(
dirPath,
GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
0,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS | FILE_ATTRIBUTE_NORMAL,
0
);
if (handle == INVALID_HANDLE_VALUE)
{
return IntPtr.Zero;
}
else
{
return handle;
}
}
public static bool CloseDirectoryHandle(IntPtr handle)
{
return CloseHandle(handle);
}
}
// Structure with information for RegisterDeviceNotification.
[StructLayout(LayoutKind.Sequential)]
public struct DEV_BROADCAST_HANDLE
{
public int dbch_size;
public int dbch_devicetype;
public int dbch_reserved;
public IntPtr dbch_handle;
public IntPtr dbch_hdevnotify;
public Guid dbch_eventguid;
public long dbch_nameoffset;
//public byte[] dbch_data[1]; // = new byte[1];
public byte dbch_data;
public byte dbch_data1;
}
// Struct for parameters of the WM_DEVICECHANGE message
[StructLayout(LayoutKind.Sequential)]
public struct DEV_BROADCAST_VOLUME
{
public int dbcv_size;
public int dbcv_devicetype;
public int dbcv_reserved;
public int dbcv_unitmask;
}
}
}
