一、監聽USB設備的插入和彈出

當USB設備插入或者彈出時，Windows會產生一條全局消息：WM_DEVICECHANGE

我們需要做的是，獲得這條消息的wParam參數，如果為DBT_DEVICEARRIVAL則表示有設備插入并可用，

如果是DBT_DEVICEREMOVECOMPLETE則表示有設備已經移除。再查看lParam參數為DBT_DEVTYP_VOLUME時，

就可以取出DEV_BROADCAST_VOLUME結構的卷號dbcv_unitmask，就知道是哪個卷被插入或者彈出。

代碼片段如下：

[c-sharp]?view plaincopyprint?

using?System;??

using?System.Runtime.InteropServices;??

///?<summary>???

///?監聽設備的插入和拔出???

///?</summary>???

public?class?DriveDetector??

{??

????///?<summary>???

????///?設備插入事件???

????///?</summary>???

????public?event?EventHandler<DriveDectctorEventArgs>?DeviceArrived?=?null;??

????///?<summary>???

????///?設備拔出事件???

????///?</summary>???

????public?event?EventHandler<DriveDectctorEventArgs>?DeviceRemoved?=?null;??

????///?<summary>???

????///?消息處理(HwndSourceHook委托的簽名)???

????///?</summary>???

????///?<param?name="hwnd"></param>???

????///?<param?name="msg"></param>???

????///?<param?name="wParam"></param>???

????///?<param?name="lParam"></param>???

????///?<param?name="handled"></param>???

????///?<returns></returns>???

????public?IntPtr?WndProc(??

????????IntPtr?hwnd,??

????????int?msg,??

????????IntPtr?wParam,??

????????IntPtr?lParam,??

????????ref?bool?handled)??

????{??

????????if?(msg?==?NativeConstants.WM_DEVICECHANGE)??

????????{??

#warning?USB設備檢測目前只支持32位系統)???

????????????switch?(wParam.ToInt32())??

????????????{??

????????????????case?NativeConstants.DBT_DEVICEARRIVAL:??

????????????????????{??

????????????????????????var?devType?=?Marshal.ReadInt32(lParam,?4);??

????????????????????????if?(devType?==?NativeConstants.DBT_DEVTYP_VOLUME)??

????????????????????????{??

????????????????????????????var?drive?=?GetDrive(lParam);??

????????????????????????????if?(DeviceArrived?!=?null)??

????????????????????????????{??

????????????????????????????????var?args?=?new?DriveDectctorEventArgs(drive);??

????????????????????????????????DeviceArrived(this,?args);?//觸發設備插入事件???

????????????????????????????}??

????????????????????????}??

????????????????????}??

????????????????????break;??

????????????????case?NativeConstants.DBT_DEVICEREMOVECOMPLETE:??

????????????????????{??

????????????????????????var?devType?=?Marshal.ReadInt32(lParam,?4);??

????????????????????????if?(devType?==?NativeConstants.DBT_DEVTYP_VOLUME)??

????????????????????????{??

????????????????????????????var?drive?=?GetDrive(lParam);??

????????????????????????????if?(DeviceRemoved?!=?null)??

????????????????????????????{??

????????????????????????????????var?args?=?new?DriveDectctorEventArgs(drive);??

????????????????????????????????DeviceRemoved(this,?args);??

????????????????????????????}??

????????????????????????}??

????????????????????}??

????????????????????break;??

????????????}??

????????}??

????????return?IntPtr.Zero;??

????}??

????private?static?string?GetDrive(IntPtr?lParam)??

????{??

????????var?volume?=?(DEV_BROADCAST_VOLUME)Marshal.PtrToStructure(lParam,?typeof(DEV_BROADCAST_VOLUME));??

????????var?letter?=?GetLetter(volume.dbcv_unitmask);??

????????return?string.Format("{0}://",?letter);??

????}??

????///?<summary>???

????///?獲得盤符???

????///?</summary>???

????///?<param?name="dbcvUnitmask">???

????///?1?=?A???

????///?2?=?B???

????///?4?=?C...???

????///?</param>???

????///?<returns>結果是A~Z的任意一個字符或者為'?'</returns>???

????private?static?char?GetLetter(uint?dbcvUnitmask)??

????{??

????????const?char?nona?=?'?';??

????????const?string?drives?=?"ABCDEFGHIJKLMNOPQRSTUVWXYZ";??

????????if?(dbcvUnitmask?==?0)?return?nona;??

????????var?i?=?0;??

????????var?pom?=?dbcvUnitmask?>>?1;??

????????while?(pom?!=?0)??

????????{??

????????????pom?=?pom?>>?1;??

????????????i++;??

????????}??

????????if?(i?<?drives.Length)??

????????????return?drives[i];??

????????return?nona;??

????}??

????/*???

??????private?static?void?GetLetterTest()?

??????{?

??????????for?(int?i?=?0;?i?<?67108864;?i++)?

??????????{?

??????????????Console.WriteLine("{0}?-?{1}",?i,?GetLetter((uint)i));?

??????????????i?=?i?<<?1;?

??????????}?

//0?-???

//1?-?A?

//3?-?B?

//7?-?C?

//15?-?D?

//31?-?E?

//63?-?F?

//127?-?G?

//255?-?H?

//511?-?I?

//1023?-?J?

//2047?-?K?

//4095?-?L?

//8191?-?M?

//16383?-?N?

//32767?-?O?

//65535?-?P?

//131071?-?Q?

//262143?-?R?

//524287?-?S?

//1048575?-?T?

//2097151?-?U?

//4194303?-?V?

//8388607?-?W?

//16777215?-?X?

//33554431?-?Y?

//67108863?-?Z?

??????}*/??

????///?<summary>???

????///?設備插入或拔出事件???

????///?</summary>???

????public?class?DriveDectctorEventArgs?:?EventArgs??

????{??

????????///?<summary>???

????????///?獲得設備卷標???

????????///?</summary>???

????????public?string?Drive?{?get;?private?set;?}??

????????public?DriveDectctorEventArgs(string?drive)??

????????{??

????????????Drive?=?drive????string.Empty;??

????????}??

????}??

????#region?Win32?API???

????public?partial?class?NativeConstants??

????{??

????????///?WM_DEVICECHANGE?->?0x0219???

????????public?const?int?WM_DEVICECHANGE?=?537;??

????????///?BROADCAST_QUERY_DENY?->?0x424D5144???

????????//public?const?int?BROADCAST_QUERY_DENY?=?1112363332;???

????????//public?const?int?DBT_DEVTYP_DEVICEINTERFACE?=?5;???

????????//public?const?int?DBT_DEVTYP_HANDLE?=?6;???

????????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???

????}??

????[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]??

????public?struct?DEV_BROADCAST_VOLUME??

????{??

????????///?DWORD->unsigned?int???

????????public?uint?dbcv_size;??

????????///?DWORD->unsigned?int???

????????public?uint?dbcv_devicetype;??

????????///?DWORD->unsigned?int???

????????public?uint?dbcv_reserved;??

????????///?DWORD->unsigned?int???

????????public?uint?dbcv_unitmask;??

????????///?WORD->unsigned?short???

????????public?ushort?dbcv_flags;??

????}??

????[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]??

????public?struct?OVERLAPPED??

????{??

????????///?ULONG_PTR->unsigned?int???

????????public?uint?Internal;??

????????///?ULONG_PTR->unsigned?int???

????????public?uint?InternalHigh;??

????????///?Anonymous_7416d31a_1ce9_4e50_b1e1_0f2ad25c0196???

????????public?Anonymous_7416d31a_1ce9_4e50_b1e1_0f2ad25c0196?Union1;??

????????///?HANDLE->void*???

????????public?System.IntPtr?hEvent;??

????}??

????[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Explicit)]??

????public?struct?Anonymous_7416d31a_1ce9_4e50_b1e1_0f2ad25c0196??

????{??

????????///?Anonymous_ac6e4301_4438_458f_96dd_e86faeeca2a6???

????????[System.Runtime.InteropServices.FieldOffsetAttribute(0)]??

????????public?Anonymous_ac6e4301_4438_458f_96dd_e86faeeca2a6?Struct1;??

????????///?PVOID->void*???

????????[System.Runtime.InteropServices.FieldOffsetAttribute(0)]??

????????public?System.IntPtr?Pointer;??

????}??

????[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]??

????public?struct?Anonymous_ac6e4301_4438_458f_96dd_e86faeeca2a6??

????{??

????????///?DWORD->unsigned?int???

????????public?uint?Offset;??

????????///?DWORD->unsigned?int???

????????public?uint?OffsetHigh;??

????}??

????[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]??

????public?struct?SECURITY_ATTRIBUTES??

????{??

????????///?DWORD->unsigned?int???

????????public?uint?nLength;??

????????///?LPVOID->void*???

????????public?System.IntPtr?lpSecurityDescriptor;??

????????///?BOOL->int???

????????[System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]??

????????public?bool?bInheritHandle;??

????}??

????#endregion???

}??

現在，你可以在你的UI線程上創建一個DriveDetector對象，監聽DeviceArrived和DeviceRemoved事件。

然后通過該對象WndProc方法，傳遞UI線程上的消息。WPF程序可以直接用HwndSource對象AddHook，此方法的簽名

與HwndSourceHook委托相同。WinForm程序也沒關系，override窗口的void WndProc(ref Message m)方法，按

DriveDetector對象的WndProc簽名格式，將m數據傳入，或者干脆自己寫個WinForm版本的。

我的演示代碼效果圖如下：(注，上述代碼未提供顯示代碼，請自己編寫)

另外，關于磁盤容量的監視可以使用FileSystemWatcher對象。

請參考：http://msdn.microsoft.com/zh-cn/library/cc437966.aspx

摘取代碼如下：

[c-sharp]?view plaincopyprint?

using?System;??

using?System.IO;??

using?System.Security.Permissions;??

public?class?Watcher??

{??

????public?static?void?Main()??

????{??

????????Run();??

????}??

????[PermissionSet(SecurityAction.Demand,?Name="FullTrust")]??

????public?static?void?Run()??

????{??

????????string[]?args?=?System.Environment.GetCommandLineArgs();??

????????//?If?a?directory?is?not?specified,?exit?program.???

????????if(args.Length?!=?2)??

????????{??

????????????//?Display?the?proper?way?to?call?the?program.???

????????????Console.WriteLine("Usage:?Watcher.exe?(directory)");??

????????????return;??

????????}??

????????//?Create?a?new?FileSystemWatcher?and?set?its?properties.???

????????FileSystemWatcher?watcher?=?new?FileSystemWatcher();??

????????watcher.Path?=?args[1];??

????????/*?Watch?for?changes?in?LastAccess?and?LastWrite?times,?and?

???????????the?renaming?of?files?or?directories.?*/??

????????watcher.NotifyFilter?=?NotifyFilters.LastAccess?|?NotifyFilters.LastWrite??

???????????|?NotifyFilters.FileName?|?NotifyFilters.DirectoryName;??

????????//?Only?watch?text?files.???

????????//watcher.Filter?=?"*.txt";???

????????watcher.IncludeSubdirectories=true;??

????????//?Add?event?handlers.???

????????watcher.Changed?+=?new?FileSystemEventHandler(OnChanged);??

????????watcher.Created?+=?new?FileSystemEventHandler(OnChanged);??

????????watcher.Deleted?+=?new?FileSystemEventHandler(OnChanged);??

????????watcher.Renamed?+=?new?RenamedEventHandler(OnRenamed);??

????????//?Begin?watching.???

????????watcher.EnableRaisingEvents?=?true;??

????????//?Wait?for?the?user?to?quit?the?program.???

????????Console.WriteLine("Press?/'q/'?to?quit?the?sample.");??

????????while(Console.Read()!='q');??

????}??

????//?Define?the?event?handlers.???

????private?static?void?OnChanged(object?source,?FileSystemEventArgs?e)??

????{??

????????//?Specify?what?is?done?when?a?file?is?changed,?created,?or?deleted.???

???????Console.WriteLine("File:?"?+??e.FullPath?+?"?"?+?e.ChangeType);??

????}??

????private?static?void?OnRenamed(object?source,?RenamedEventArgs?e)??

????{??

????????//?Specify?what?is?done?when?a?file?is?renamed.???

????????Console.WriteLine("File:?{0}?renamed?to?{1}",?e.OldFullPath,?e.FullPath);??

????}??

}??

二、軟件彈出可移動媒體

網上有一部分關于這方法的代碼，我的代碼是從MSDN獲取的VC++版本，需要調用多個API函數，轉換為C#代碼如下：

參考：http://support.microsoft.com/kb/165721

[c-sharp]?view plaincopyprint?

using?System;??

using?System.Runtime.InteropServices;??

using?System.Threading;??

///?<summary>???

///?彈出可移動媒體???

///?</summary>???

///?<see?cref="http://support.microsoft.com/kb/165721"/>???

public?static?class?Eject??

{??

????private?static?void?ReportError(string?szMsg)??

????{??

????????const?string?szErrorFormat?=?"Error?{0}:?{1}";??

????????var?error?=?string.Format(szErrorFormat,?GetLastError(),?szMsg);??

????????Console.Error.WriteLine(error);??

????}??

????private?static?IntPtr?OpenVolume(char?driveLetter)??

????{??

????????const?string?volumeFormat?=?".//{0}:";??

????????const?string?rootFormat?=?"{0}://";??

????????int?accessFlags;??

????????var?rootName?=?string.Format(rootFormat,?driveLetter);??

????????var?driveType?=?GetDriveTypeW(rootName);??

????????switch?(driveType)??

????????{??

????????????case?DRIVE_REMOVABLE:??

????????????????accessFlags?=?GENERIC_READ?|?GENERIC_WRITE;??

????????????????break;??

????????????case?DRIVE_CDROM:??

????????????????accessFlags?=?GENERIC_READ;??

????????????????break;??

????????????default:??

????????????????Console.Error.WriteLine("Cannot?eject.?Drive?type?is?incorrect.");??

????????????????return?new?IntPtr(INVALID_HANDLE_VALUE);??

????????}??

????????var?volumeName?=?string.Format(volumeFormat,?driveLetter);??

????????var?hVolume?=?CreateFileW(??

????????????volumeName,??

????????????accessFlags,??

????????????FILE_SHARE_READ?|?FILE_SHARE_WRITE,??

????????????IntPtr.Zero,??

????????????OPEN_EXISTING,??

????????????0,??

????????????IntPtr.Zero);??

????????if?(hVolume?==?new?IntPtr(INVALID_HANDLE_VALUE))??

????????????ReportError("CreateFile");??

????????return?hVolume;??

????}??

????private?static?bool?CloseVolume(IntPtr?hVolume)??

????{??

????????return?CloseHandle(hVolume);??

????}??

????private?static?bool?LockVolume(IntPtr?hVolume)??

????{??

????????const?int?LOCK_TIMEOUT?=?10000;?//10?Seconds???

????????const?int?LOCK_RETRIES?=?20;??

????????var?sleepAmount?=?LOCK_TIMEOUT?/?LOCK_RETRIES;??

????????//Do?this?in?a?loop?until?a?timeout?period?has?expired???

????????for?(int?tryCount?=?0;?tryCount?<?LOCK_RETRIES;?tryCount++)??

????????{??

????????????int?dwBytesReturned;??

????????????if?(DeviceIoControl(??

????????????????hVolume,??

????????????????FSCTL_LOCK_VOLUME,??

????????????????IntPtr.Zero,?0,??

????????????????IntPtr.Zero,?0,??

????????????????out?dwBytesReturned,??

????????????????IntPtr.Zero))??

????????????????return?true;?//return???

????????????Thread.Sleep(sleepAmount);??

????????}??

????????return?false;??

????}??

????private?static?bool?DismountVolume(IntPtr?hVolume)??

????{??

????????int?dwBytesReturned;??

????????return?DeviceIoControl(??

????????????hVolume,??

????????????FSCTL_DISMOUNT_VOLUME,??

????????????IntPtr.Zero,?0,??

????????????IntPtr.Zero,?0,??

????????????out?dwBytesReturned,??

????????????IntPtr.Zero);??

????}??

????private?static?bool?PresentRemovalOfVolume(IntPtr?hVolume,bool?preventRemoval)??

????{??

????????PREVENT_MEDIA_REMOVAL?pmrBuffer;??

????????pmrBuffer.PreventMediaRemoval?=?preventRemoval;??

??????????

????????var?size?=?Marshal.SizeOf(pmrBuffer);??

????????IntPtr?ptr?=?Marshal.AllocHGlobal(size);??

????????try??

????????{??

????????????Marshal.StructureToPtr(pmrBuffer,?ptr,?false);??

????????????int?dwBytesReturned;??

????????????return?DeviceIoControl(??

????????????????hVolume,??

????????????????IOCTL_STORAGE_MEDIA_REMOVAL,??

????????????????ptr,?(uint)?size,??

????????????????IntPtr.Zero,?0,??

????????????????out?dwBytesReturned,??

????????????????IntPtr.Zero??

????????????????);??

????????}??

????????finally??

????????{??

????????????Marshal.DestroyStructure(ptr,?pmrBuffer.GetType());??

????????}??

????}??

????private?static?bool?AutoEjectVolume(IntPtr?hVolume)??

????{??

????????int?dwBytesReturned;??

????????return?DeviceIoControl(??

????????????hVolume,??

????????????IOCTL_STORAGE_EJECT_MEDIA,??

????????????IntPtr.Zero,?0,??

????????????IntPtr.Zero,?0,??

????????????out?dwBytesReturned,??

????????????IntPtr.Zero);??

????}??

????private?static?bool?RemoveVolumeDefinition(string?deviceName)??

????{??

????????return?DefineDosDeviceW(DDD_REMOVE_DEFINITION,?deviceName,?null);??

????}??

??????

????public?static?bool?EjectVolume(char?driveLetter,?bool?removeVolumeDefinition)??

????{??

????????var?removeSafely?=?false;??

????????var?autoEject?=?false;??

????????//Open?the?volume.???

????????var?hVolume?=?OpenVolume(driveLetter);??

????????if?(hVolume?==?new?IntPtr(INVALID_HANDLE_VALUE))??

????????????return?false;??

????????//Lock?and?dismount?the?volume.???

????????if(LockVolume(hVolume)&&DismountVolume(hVolume))??

????????{??

????????????removeSafely?=?true;??

????????????//Set?prevent?removal?to?false?and?eject?the?volume.???

????????????if?(PresentRemovalOfVolume(hVolume,?false)?&&?AutoEjectVolume(hVolume))??

????????????????autoEject?=?true;??

????????}??

????????//Close?the?volume?so?other?processes?can?use?the?drive.???

????????if?(!CloseVolume(hVolume))??

????????????return?false;??

????????if(autoEject)??

????????{??

????????????Console.Out.WriteLine("Media?in?Drive?{0}?has?been?ejected?safely.",driveLetter);??

????????}??

????????else??

????????{??

????????????if?(removeSafely)??

????????????{??

????????????????Console.Out.WriteLine("Media?in?Drive?{0}?can?be?safely?removed.",?driveLetter);??

????????????}??

????????????else??

????????????{??

????????????????Console.Error.WriteLine("Media?in?Drive?{0}?is?working,?and?can't?be?safely?removed.",?driveLetter);??

????????????????return?false;??

????????????}??

????????}??

????????if(removeVolumeDefinition)?RemoveVolumeDefinition(string.Format("{0}:",?driveLetter));??

????????return?true;??

????}??

????public?static?void?Usage()??

????{??

????????Console.Out.WriteLine("Usage:?Eject?<drive?letter>");??

????????Console.Out.WriteLine();??

????}??

????static?void?Main(string[]?args)??

????{??

????????if(args.Length?!=?1)??

????????{??

????????????Usage();??

????????????return;??

????????}??

??????????

????????if(!EjectVolume(args[0][0],?true))??

????????{??

????????????Console.Error.WriteLine("Failure?ejecting?drive?{0}.",args[0][0]);??

????????}??

????}??

????#region?WIN32?API???

????///?Return?Type:?DWORD->unsigned?int???

????[System.Runtime.InteropServices.DllImportAttribute("kernel32.dll",?EntryPoint?=?"GetLastError")]??

????public?static?extern?uint?GetLastError();??

????///?Return?Type:?UINT->unsigned?int???

????///lpRootPathName:?LPCWSTR->WCHAR*???

????[System.Runtime.InteropServices.DllImportAttribute("kernel32.dll",?EntryPoint?=?"GetDriveTypeW")]??

????public?static?extern?uint?GetDriveTypeW([System.Runtime.InteropServices.InAttribute()]?[System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)]?string?lpRootPathName);??

????///?Return?Type:?HANDLE->void*???

????///lpFileName:?LPCWSTR->WCHAR*???

????///dwDesiredAccess:?DWORD->unsigned?int???

????///dwShareMode:?DWORD->unsigned?int???

????///lpSecurityAttributes:?LPSECURITY_ATTRIBUTES->_SECURITY_ATTRIBUTES*???

????///dwCreationDisposition:?DWORD->unsigned?int???

????///dwFlagsAndAttributes:?DWORD->unsigned?int???

????///hTemplateFile:?HANDLE->void*???

????[System.Runtime.InteropServices.DllImportAttribute("kernel32.dll",?EntryPoint?=?"CreateFileW")]??

????public?static?extern?System.IntPtr?CreateFileW([System.Runtime.InteropServices.InAttribute()]?[System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)]?string?lpFileName,?int?dwDesiredAccess,?uint?dwShareMode,?[System.Runtime.InteropServices.InAttribute()]?System.IntPtr?lpSecurityAttributes,?uint?dwCreationDisposition,?uint?dwFlagsAndAttributes,?[System.Runtime.InteropServices.InAttribute()]?System.IntPtr?hTemplateFile);??

????///?Return?Type:?BOOL->int???

????///hObject:?HANDLE->void*???

????[System.Runtime.InteropServices.DllImportAttribute("kernel32.dll",?EntryPoint?=?"CloseHandle")]??

????[return:?System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]??

????public?static?extern?bool?CloseHandle([System.Runtime.InteropServices.InAttribute()]?System.IntPtr?hObject);??

????///?Return?Type:?BOOL->int???

????///hDevice:?HANDLE->void*???

????///dwIoControlCode:?DWORD->unsigned?int???

????///lpInBuffer:?LPVOID->void*???

????///nInBufferSize:?DWORD->unsigned?int???

????///lpOutBuffer:?LPVOID->void*???

????///nOutBufferSize:?DWORD->unsigned?int???

????///lpBytesReturned:?LPDWORD->DWORD*???

????///lpOverlapped:?LPOVERLAPPED->_OVERLAPPED*???

????[System.Runtime.InteropServices.DllImportAttribute("kernel32.dll",?EntryPoint?=?"DeviceIoControl")]??

????[return:?System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]??

????public?static?extern?bool?DeviceIoControl([System.Runtime.InteropServices.InAttribute()]?System.IntPtr?hDevice,?uint?dwIoControlCode,?[System.Runtime.InteropServices.InAttribute()]?System.IntPtr?lpInBuffer,?uint?nInBufferSize,?System.IntPtr?lpOutBuffer,?uint?nOutBufferSize,?out?int?lpBytesReturned,?System.IntPtr?lpOverlapped);??

??

????///?DRIVE_REMOVABLE?->?2???

????public?const?int?DRIVE_REMOVABLE?=?2;??

????///?DRIVE_CDROM?->?5???

????public?const?int?DRIVE_CDROM?=?5;??

????///?INVALID_HANDLE_VALUE?->?-1???

????public?const?int?INVALID_HANDLE_VALUE?=?-1;??

????///?GENERIC_READ?->?(0x80000000L)???

????public?const?int?GENERIC_READ?=?-2147483648;??

????///?GENERIC_WRITE?->?(0x40000000L)???

????public?const?int?GENERIC_WRITE?=?1073741824;??

????///?FILE_SHARE_READ?->?0x00000001???

????public?const?int?FILE_SHARE_READ?=?1;??

????///?FILE_SHARE_WRITE?->?0x00000002???

????public?const?int?FILE_SHARE_WRITE?=?2;??

????///?OPEN_EXISTING?->?3???

????public?const?int?OPEN_EXISTING?=?3;??

????//WinIoCtl.h???

????//???

????//#define?CTL_CODE(?DeviceType,?Function,?Method,?Access?)?(?????????????????/???

????//??((DeviceType)?<<?16)?|?((Access)?<<?14)?|?((Function)?<<?2)?|?(Method)?/???

????//)???

????private?const?int?FILE_DEVICE_FILE_SYSTEM?=?0x00000009;??

????private?const?int?METHOD_BUFFERED?=?0;??

????private?const?int?FILE_ANY_ACCESS?=?0;??

????//#define?FSCTL_LOCK_VOLUME???????????????CTL_CODE(FILE_DEVICE_FILE_SYSTEM,??6,?METHOD_BUFFERED,?FILE_ANY_ACCESS)???

????public?const?int?FSCTL_LOCK_VOLUME?=?((FILE_DEVICE_FILE_SYSTEM)?<<?16)?|?((FILE_ANY_ACCESS)?<<?14)?|?((6)?<<?2)?|?(METHOD_BUFFERED);??

????public?const?int?FSCTL_UNLOCK_VOLUME?=?((FILE_DEVICE_FILE_SYSTEM)?<<?16)?|?((FILE_ANY_ACCESS)?<<?14)?|?((7)?<<?2)?|?(METHOD_BUFFERED);??

????public?const?int?FSCTL_DISMOUNT_VOLUME?=?((FILE_DEVICE_FILE_SYSTEM)?<<?16)?|?((FILE_ANY_ACCESS)?<<?14)?|?((8)?<<?2)?|?(METHOD_BUFFERED);??

????//#define?IOCTL_STORAGE_BASE?FILE_DEVICE_MASS_STORAGE???

????private?const?int?FILE_DEVICE_MASS_STORAGE?=?0x0000002d;??

????private?const?int?IOCTL_STORAGE_BASE?=?FILE_DEVICE_MASS_STORAGE;??

????//#define?FILE_READ_ACCESS??????????(?0x0001?)????//?file?&?pipe???

????private?const?int?FILE_READ_ACCESS?=?0x0001;??

??????

????//#define?IOCTL_STORAGE_MEDIA_REMOVAL???????????CTL_CODE(IOCTL_STORAGE_BASE,?0x0201,?METHOD_BUFFERED,?FILE_READ_ACCESS)???

????public?const?int?IOCTL_STORAGE_MEDIA_REMOVAL?=??

????????((IOCTL_STORAGE_BASE)?<<?16)?|?((FILE_READ_ACCESS)?<<?14)?|?((0x0201)?<<?2)?|?(METHOD_BUFFERED);??

????//#define?IOCTL_STORAGE_EJECT_MEDIA?????????????CTL_CODE(IOCTL_STORAGE_BASE,?0x0202,?METHOD_BUFFERED,?FILE_READ_ACCESS)???

????public?const?int?IOCTL_STORAGE_EJECT_MEDIA?=??

????????((IOCTL_STORAGE_BASE)?<<?16)?|?((FILE_READ_ACCESS)?<<?14)?|?((0x0202)?<<?2)?|?(METHOD_BUFFERED);??

??

????[System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]??

????public?struct?PREVENT_MEDIA_REMOVAL??

????{??

????????///?BOOLEAN->BYTE->unsigned?char???

????????[MarshalAs(UnmanagedType.I1)]??

????????public?bool?PreventMediaRemoval;??

????}??

?????

????#region?Remove?Volume?Definition???

????///?DDD_REMOVE_DEFINITION?->?0x00000002???

????public?const?int?DDD_REMOVE_DEFINITION?=?2;??

??????????

????///?Return?Type:?BOOL->int???

????///dwFlags:?DWORD->unsigned?int???

????///lpDeviceName:?LPCWSTR->WCHAR*???

????///lpTargetPath:?LPCWSTR->WCHAR*???

????[System.Runtime.InteropServices.DllImportAttribute("kernel32.dll",?EntryPoint="DefineDosDeviceW")]??

????[return:?System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]??

????public?static?extern??bool?DefineDosDeviceW(uint?dwFlags,?[System.Runtime.InteropServices.InAttribute()]?[System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)]?string?lpDeviceName,?[System.Runtime.InteropServices.InAttribute()]?[System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)]?string?lpTargetPath)?;??

????#endregion??

?????

????#endregion???

}??

預覽：(注，彈出可移動磁盤，并不會刪除驅動器號，但設備已經被彈出，如圖中的h盤)

注：已改進，安全彈出后，通過DDD_REMOVE_DEFINITION移除h盤。

總結

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