Como Remover USB ou qualquer Hardware via Delphi

// ========================================================================== 
// USB - Insertion and Removal Detection Class 
// Mike Heydon 2007 
// 
// Assignable Events 
// eg. procedure TForm1.MyOnInsert(AObject : TObject; 
//                                 const ADevType,ADriverName, 
//                                       AFriendlyName : string) 
// 
// OnUsbInsertion : TOnUsbChangeEvent 
// OnUsbRemoval : TOnUsbChangeEvent 
// 
// Example of string returned by API 
// 
// \\?\USB#Vid_4146&Pid_d2b5#0005050400044#{a5dcbf10-6530-11d2-901f-00c04fb951ed} 
// 
// Example of output from above string from my Iomega Stick : 
// 
// USB Inserted 
// Device Type   = USB Mass Storage Device 
// Driver Name   = Disk drive 
// Friendly Name = I0MEGA UMni1GB*IOM2J4 USB Device 
// 
// Example Code (Skeleton) .... 
// 
// interface 
// uses MahUSB 
// 
// type 
//   TForm1 = class(TForm) 
//     procedure FormShow(Sender: TObject); 
//     procedure FormClose(Sender: TObject; var Action: TCloseAction); 
//   private 
//     { Private declarations } 
//     FUsb : TUsbClass; 
//     procedure UsbIN(ASender : TObject; const ADevType,ADriverName, 
//                     AFriendlyName : string); 
//     procedure UsbOUT(ASender : TObject; const ADevType,ADriverName, 
//                      AFriendlyName : string); 
//   public 
//   end; 
// 
// implementation 
// 
// procedure TForm1.FormShow(Sender: TObject); 
// begin 
//   FUsb := TUsbClass.Create; 
//   FUsb.OnUsbInsertion := UsbIN; 
//   FUsb.OnUsbRemoval := UsbOUT; 
// end; 
// 
// procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction); 
// begin 
//   FreeAndNil(FUsb); 
// end; 
// 
// procedure TForm1.UsbIN(ASender : TObject; const ADevType,ADriverName, 
//                        AFriendlyName : string); 
// begin 
//   showmessage(USB Inserted - Device Type =  + ADevType + #13#10 + 
//               Driver Name =  + ADriverName + #13+#10 + 
//               Friendly Name =  + AFriendlyName); 
// end; 
// 
// 
// procedure TForm1.UsbOUT(ASender : TObject; const ADevType,ADriverName, 
//                         AFriendlyName : string); 
// begin 
//   showmessage(USB Removed - Device Type =  + ADevType + #13#10 + 
//               Driver Name =  + ADriverName + #13+#10 + 
//               Friendly Name =  + AFriendlyName); 
// end; 
// 
// end. 
// 
// ========================================================================= 

unit MahUSB; 
interface 
uses Windows, Messages, SysUtils, Classes, Registry, Masks; 

type 
  { Event Types } 
  TOnUsbChangeEvent = procedure(AObject : TObject; 
                                const ADevType,ADriverName, 
                                      AFriendlyName : string) of object; 

  { USB Class } 
  TUsbClass = class(TObject) 
  private 
    FHandle : HWND; 
    FOnUsbRemoval, 
    FOnUsbInsertion : TOnUsbChangeEvent; 
    procedure GetUsbInfo(const ADeviceString : string; 
                         out ADevType,ADriverDesc, 
                            AFriendlyName : string); 
    procedure WinMethod(var AMessage : TMessage); 
    procedure RegisterUsbHandler; 
    procedure WMDeviceChange(var AMessage : TMessage); 
  public 
    constructor Create; 
    destructor Destroy; override; 
    property OnUsbInsertion : TOnUsbChangeEvent read FOnUsbInsertion 
                                           write FOnUsbInsertion; 
    property OnUsbRemoval : TOnUsbChangeEvent read FOnUsbRemoval 
                                         write FOnUsbRemoval; 
  end; 



// ----------------------------------------------------------------------------- 
implementation 

type 
  // Win API Definitions 
  PDevBroadcastDeviceInterface  = ^DEV_BROADCAST_DEVICEINTERFACE; 
  DEV_BROADCAST_DEVICEINTERFACE = record 
    dbcc_size : DWORD; 
    dbcc_devicetype : DWORD; 
    dbcc_reserved : DWORD; 
    dbcc_classguid : TGUID; 
    dbcc_name : char; 
  end; 

const 
  // Miscellaneous 
  GUID_DEVINTF_USB_DEVICE : TGUID = {A5DCBF10-6530-11D2-901F-00C04FB951ED}; 
  USB_INTERFACE                = $00000005; // Device interface class 
  USB_INSERTION                = $8000;     // System detected a new device 
  USB_REMOVAL                  = $8004;     // Device is gone 

  // Registry Keys 
  USBKEY  = SYSTEM\CurrentControlSet\Enum\USB\%s\%s; 
  USBSTORKEY = SYSTEM\CurrentControlSet\Enum\USBSTOR; 
  SUBKEY1  = USBSTORKEY + \%s; 
  SUBKEY2  = SUBKEY1 + \%s; 


constructor TUsbClass.Create; 
begin 
  inherited Create; 
  FHandle := AllocateHWnd(WinMethod); 
  RegisterUsbHandler; 
end; 


destructor TUsbClass.Destroy; 
begin 
  DeallocateHWnd(FHandle); 
  inherited Destroy; 
end; 


procedure TUsbClass.GetUsbInfo(const ADeviceString : string; 
                               out ADevType,ADriverDesc, 
                                   AFriendlyName : string); 
var sWork,sKey1,sKey2 : string; 
    oKeys,oSubKeys : TStringList; 
    oReg : TRegistry; 
    i,ii : integer; 
    bFound : boolean; 
begin 
  ADevType := ; 
  ADriverDesc := ; 
  AFriendlyName := ; 

  if ADeviceString <>  then begin 
    bFound := false; 
    oReg := TRegistry.Create; 
    oReg.RootKey := HKEY_LOCAL_MACHINE; 

    // Extract the portions of the string we need for registry. eg. 
    // \\?\USB#Vid_4146&Pid_d2b5#0005050400044#{a5dcbf10- ..... -54334fb951ed} 
    // We need sKey1=Vid_4146&Pid_d2b5 and sKey2=0005050400044 
    sWork := copy(ADeviceString,pos(#,ADeviceString) + 1,1026); 
    sKey1 := copy(sWork,1,pos(#,sWork) - 1); 
    sWork := copy(sWork,pos(#,sWork) + 1,1026); 
    sKey2 := copy(sWork,1,pos(#,sWork) - 1); 

    // Get the Device type description from \USB key 
    if oReg.OpenKeyReadOnly(Format(USBKEY,[skey1,sKey2])) then begin 
      ADevType := oReg.ReadString(DeviceDesc); 
      oReg.CloseKey; 
      oKeys := TStringList.Create; 
      oSubKeys := TStringList.Create; 

      // Get list of keys in \USBSTOR and enumerate each key 
      // for a key that matches our sKey2=0005050400044 
      // NOTE : The entry we are looking for normally has &0 
      // appended to it eg. 0005050400044&0 
      if oReg.OpenKeyReadOnly(USBSTORKEY) then begin 
        oReg.GetKeyNames(oKeys); 
        oReg.CloseKey; 

        // Iterate through list to find our sKey2 
        for i := 0 to oKeys.Count - 1 do begin 
          if oReg.OpenKeyReadOnly(Format(SUBKEY1,[oKeys[i]])) then begin 
            oReg.GetKeyNames(oSubKeys); 
            oReg.CloseKey; 

            for ii := 0 to oSubKeys.Count - 1 do begin 
              if MatchesMask(oSubKeys[ii],sKey2 + *) then begin 
                // Got a match?, get the actual desc and friendly name 
                if oReg.OpenKeyReadOnly(Format(SUBKEY2,[oKeys[i], 
                                        oSubKeys[ii]])) then begin 
                  ADriverDesc := oReg.ReadString(DeviceDesc); 
                  AFriendlyName := oReg.ReadString(FriendlyName); 
                  oReg.CloseKey; 
                end; 

                bFound := true; 
              end; 
            end; 
          end; 

          if bFound then break; 
        end; 
      end; 

      FreeAndNil(oKeys); 
      FreeAndNil(oSubKeys); 
    end; 

    FreeAndNil(oReg); 
  end; 
end; 


procedure TUsbClass.WMDeviceChange(var AMessage : TMessage); 
var iDevType : integer; 
    sDevString,sDevType, 
    sDriverName,sFriendlyName : string; 
    pData : PDevBroadcastDeviceInterface; 
begin 
  if (AMessage.wParam = USB_INSERTION) or 
     (AMessage.wParam = USB_REMOVAL) then begin 
    pData := PDevBroadcastDeviceInterface(AMessage.LParam); 
    iDevType := pData^.dbcc_devicetype; 

    // Is it a USB Interface Device ? 
    if iDevType = USB_INTERFACE then begin 
      sDevString := PChar(@pData^.dbcc_name); 
      GetUsbInfo(sDevString,sDevType,sDriverName,sFriendlyName); 

      // Trigger Events if assigned 
      if (AMessage.wParam = USB_INSERTION) and 
        Assigned(FOnUsbInsertion) then 
          FOnUsbInsertion(self,sDevType,sDriverName,sFriendlyName); 
      if (AMessage.wParam = USB_REMOVAL) and 
        Assigned(FOnUsbRemoval) then 
          FOnUsbRemoval(self,sDevType,sDriverName,sFriendlyName); 
    end; 
  end; 
end; 



procedure TUsbClass.WinMethod(var AMessage : TMessage); 
begin 
  if (AMessage.Msg = WM_DEVICECHANGE) then 
    WMDeviceChange(AMessage) 
  else 
    AMessage.Result := DefWindowProc(FHandle,AMessage.Msg, 
                                     AMessage.wParam,AMessage.lParam); 
end; 


procedure TUsbClass.RegisterUsbHandler; 
var rDbi : DEV_BROADCAST_DEVICEINTERFACE; 
    iSize : integer; 
begin 
  iSize := SizeOf(DEV_BROADCAST_DEVICEINTERFACE); 
  ZeroMemory(@rDbi,iSize); 
  rDbi.dbcc_size := iSize; 
  rDbi.dbcc_devicetype := USB_INTERFACE; 
  rDbi.dbcc_reserved := 0; 
  rDbi.dbcc_classguid  := GUID_DEVINTF_USB_DEVICE; 
  rDbi.dbcc_name := #0; 
  RegisterDeviceNotification(FHandle,@rDbi,DEVICE_NOTIFY_WINDOW_HANDLE); 
end; 


end.

unit MahUSB;
interface
uses Windows, Messages, SysUtils, Classes, Registry, Masks;

type
{ Event Types }
TOnUsbChangeEvent = procedure(AObject : TObject;
const ADevType,ADriverName,
AFriendlyName : string) of object;

{ USB Class }
TUsbClass = class(TObject)
private
FHandle : HWND;
FOnUsbRemoval,
FOnUsbInsertion : TOnUsbChangeEvent;
procedure GetUsbInfo(const ADeviceString : string;
out ADevType,ADriverDesc,
AFriendlyName : string);
procedure WinMethod(var AMessage : TMessage);
procedure RegisterUsbHandler;
procedure WMDeviceChange(var AMessage : TMessage);
public
constructor Create;
destructor Destroy; override;
property OnUsbInsertion : TOnUsbChangeEvent read FOnUsbInsertion
write FOnUsbInsertion;
property OnUsbRemoval : TOnUsbChangeEvent read FOnUsbRemoval
write FOnUsbRemoval;
end;

implementation

type
// Win API Definitions
PDevBroadcastDeviceInterface = ^DEV_BROADCAST_DEVICEINTERFACE;
DEV_BROADCAST_DEVICEINTERFACE = record
dbcc_size : DWORD;
dbcc_devicetype : DWORD;
dbcc_reserved : DWORD;
dbcc_classguid : TGUID;
dbcc_name : char;
end;

const
// Miscellaneous
GUID_DEVINTF_USB_DEVICE = TGUID := A5DCBF10-6530-11D2-901F-00C04FB951ED;
USB_INTERFACE = $00000005; // Device interface class
USB_INSERTION = $8000; // System detected a new device
USB_REMOVAL = $8004; // Device is gone

// Registry Keys
USBKEY = System\CurrentControlSet\Enum\USB\%s\%s;
USBSTORKEY = SYSTEM\CurrentControlSet\Enum\USBSTOR;
SUBKEY1 = USBSTORKEY + \%s;
SUBKEY2 = SUBKEY1 + \%s;


constructor TUsbClass.Create;
begin
inherited Create;
FHandle := AllocateHWnd(WinMethod);
RegisterUsbHandler;
end;


destructor TUsbClass.Destroy;
begin
DeallocateHWnd(FHandle);
inherited Destroy;
end;


procedure TUsbClass.GetUsbInfo(const ADeviceString : string;
out ADevType,ADriverDesc,
AFriendlyName : string);
var sWork,sKey1,sKey2 : string;
oKeys,oSubKeys : TStringList;
oReg : TRegistry;
i,ii : integer;
bFound : boolean;
begin
ADevType := ;
ADriverDesc := ;
AFriendlyName := ;

if ADeviceString <> true then begin
bFound := false;
oReg := TRegistry.Create;
oReg.RootKey := HKEY_LOCAL_MACHINE;

// Extract the portions of the string we need for registry. eg.
// \\?\USB#Vid_4146&Pid_d2b5#0005050400044#{a5dcbf10- ..... -54334fb951ed}
// We need sKey1=Vid_4146&Pid_d2b5 and sKey2=0005050400044
sWork := copy(ADeviceString,pos(#,ADeviceString) + 1,1026);
sKey1 := copy(sWork,1,pos(#,sWork) - 1);
sWork := copy(sWork,pos(#,sWork) + 1,1026);
sKey2 := copy(sWork,1,pos(#,sWork) - 1);

// Get the Device type description from \USB key
if oReg.OpenKeyReadOnly(Format(USBKEY,[skey1,sKey2])) then begin
ADevType := oReg.ReadString(DeviceDesc);
oReg.CloseKey;
oKeys := TStringList.Create;
oSubKeys := TStringList.Create;

// Get list of keys in \USBSTOR and enumerate each key
// for a key that matches our sKey2=0005050400044
// NOTE : The entry we are looking for normally has &0
// appended to it eg. 0005050400044&0
if oReg.OpenKeyReadOnly(USBSTORKEY) then begin
oReg.GetKeyNames(oKeys);
oReg.CloseKey;

// Iterate through list to find our sKey2
for i := 0 to oKeys.Count - 1 do begin
if oReg.OpenKeyReadOnly(Format(SUBKEY1,[oKeys[i]])) then begin
oReg.GetKeyNames(oSubKeys);
oReg.CloseKey;

for ii := 0 to oSubKeys.Count - 1 do begin
if MatchesMask(oSubKeys[ii],sKey2 + *) then begin
// Got a match?, get the actual desc and friendly name
if oReg.OpenKeyReadOnly(Format(SUBKEY2,[oKeys[i],
oSubKeys[ii]])) then begin
ADriverDesc := oReg.ReadString(DeviceDesc);
AFriendlyName := oReg.ReadString(FriendlyName);
oReg.CloseKey;
end;

bFound := true;
end;
end;
end;

if bFound then break;
end;
end;

FreeAndNil(oKeys);
FreeAndNil(oSubKeys);
end;

FreeAndNil(oReg);
end;
end;


procedure TUsbClass.WMDeviceChange(var AMessage : TMessage);
var iDevType : integer;
sDevString,sDevType,
sDriverName,sFriendlyName : string;
pData : PDevBroadcastDeviceInterface;
begin
if (AMessage.wParam = USB_INSERTION) or
(AMessage.wParam = USB_REMOVAL) then begin
pData := PDevBroadcastDeviceInterface(AMessage.LParam);
iDevType := pData^.dbcc_devicetype;

// Is it a USB Interface Device ?
if iDevType = USB_INTERFACE then begin
sDevString := PChar(@pData^.dbcc_name);
GetUsbInfo(sDevString,sDevType,sDriverName,sFriendlyName);

// Trigger Events if assigned
if (AMessage.wParam = USB_INSERTION) and
Assigned(FOnUsbInsertion) then
FOnUsbInsertion(self,sDevType,sDriverName,sFriendlyName);
if (AMessage.wParam = USB_REMOVAL) and
Assigned(FOnUsbRemoval) then
FOnUsbRemoval(self,sDevType,sDriverName,sFriendlyName);
end;
end;
end;



procedure TUsbClass.WinMethod(var AMessage : TMessage);
begin
if (AMessage.Msg = WM_DEVICECHANGE) then
WMDeviceChange(AMessage)
else
AMessage.Result := DefWindowProc(FHandle,AMessage.Msg,
AMessage.wParam,AMessage.lParam);
end;


procedure TUsbClass.RegisterUsbHandler;
var rDbi : DEV_BROADCAST_DEVICEINTERFACE;
iSize : integer;
begin
iSize := SizeOf(DEV_BROADCAST_DEVICEINTERFACE);
ZeroMemory(@rDbi,iSize);
rDbi.dbcc_size := iSize;
rDbi.dbcc_devicetype := USB_INTERFACE;
rDbi.dbcc_reserved := 0;
rDbi.dbcc_classguid := GUID_DEVINTF_USB_DEVICE;
rDbi.dbcc_name := #0;
RegisterDeviceNotification(FHandle,@rDbi,DEVICE_NOTIFY_WINDOW_HANDLE);
end;


end.