Solved

Detect when a PENDRIVER is inserted

Posted on 2009-04-15
4
209 Views
Last Modified: 2012-05-06
how to detect when a pendriver is inserted ? or any removible driver ?

i want a function for use in timer for preference, when a driver is loaded it show the label "driver F: \ is inserted"
0
Comment
Question by:MelissaCandyGirl
  • 2
  • 2
4 Comments
 
LVL 18

Expert Comment

by:Johnjces
ID: 24150737
This was answered a day or so ago with an enhancement.

See component code below, which I probably obtained from the Swiss Delphi Center or About.com

John

Google is my friend!
// Component to detect when usb devices are connected or disconnected

// using RegisterDeviceNotification
 

unit U_Usb;
 

interface
 

uses

  Windows, Messages, SysUtils, Classes, Forms;
 

type
 

  PDevBroadcastHdr  = ^DEV_BROADCAST_HDR;

  DEV_BROADCAST_HDR = packed record

    dbch_size: DWORD;

    dbch_devicetype: DWORD;

    dbch_reserved: DWORD;

  end;
 

  PDevBroadcastDeviceInterface  = ^DEV_BROADCAST_DEVICEINTERFACE;

  DEV_BROADCAST_DEVICEINTERFACE = record

    dbcc_size: DWORD;

    dbcc_devicetype: DWORD;

    dbcc_reserved: DWORD;

    dbcc_classguid: TGUID;

    dbcc_name: short;

  end;
 

const

  GUID_DEVINTERFACE_USB_DEVICE: TGUID = '{A5DCBF10-6530-11D2-901F-00C04FB951ED}';

  DBT_DEVICEARRIVAL          = $8000;          // system detected a new device

  DBT_DEVICEREMOVECOMPLETE   = $8004;          // device is gone

  DBT_DEVTYP_DEVICEINTERFACE = $00000005;      // device interface class
 

type
 

  TComponentUSB = class(TComponent)

  private

    FWindowHandle: HWND;

    FOnUSBArrival: TNotifyEvent;

    FOnUSBRemove: TNotifyEvent;

    procedure WndProc(var Msg: TMessage);

    function USBRegister: Boolean;

  protected

    procedure WMDeviceChange(var Msg: TMessage); dynamic;

  public

    constructor Create(AOwner: TComponent); override;

    destructor Destroy; override;

  published

    property OnUSBArrival: TNotifyEvent read FOnUSBArrival write FOnUSBArrival;

    property OnUSBRemove: TNotifyEvent read FOnUSBRemove write FOnUSBRemove;

  end;
 

implementation
 

constructor TComponentUSB.Create(AOwner: TComponent);

begin

  inherited Create(AOwner);

  FWindowHandle := AllocateHWnd(WndProc);

  USBRegister;

end;
 

destructor TComponentUSB.Destroy;

begin

  DeallocateHWnd(FWindowHandle);

  inherited Destroy;

end;
 

procedure TComponentUSB.WndProc(var Msg: TMessage);

begin

  if (Msg.Msg = WM_DEVICECHANGE) then 

  begin

    try

      WMDeviceChange(Msg);

    except

      Application.HandleException(Self);

    end;

  end

  else

    Msg.Result := DefWindowProc(FWindowHandle, Msg.Msg, Msg.wParam, Msg.lParam);

end;
 

procedure TComponentUSB.WMDeviceChange(var Msg: TMessage);

var

  devType: Integer;

  Datos: PDevBroadcastHdr;

begin

  if (Msg.wParam = DBT_DEVICEARRIVAL) or (Msg.wParam = DBT_DEVICEREMOVECOMPLETE) then 

  begin

    Datos := PDevBroadcastHdr(Msg.lParam);

    devType := Datos^.dbch_devicetype;

    if devType = DBT_DEVTYP_DEVICEINTERFACE then 

    begin // USB Device

      if Msg.wParam = DBT_DEVICEARRIVAL then 

      begin

        if Assigned(FOnUSBArrival) then

          FOnUSBArrival(Self);

      end 

      else 

      begin

        if Assigned(FOnUSBRemove) then

          FOnUSBRemove(Self);

      end;

    end;

  end;

end;
 

function TComponentUSB.USBRegister: Boolean;

var

  dbi: DEV_BROADCAST_DEVICEINTERFACE;

  Size: Integer;

  r: Pointer;

begin

  Result := False;

  Size := SizeOf(DEV_BROADCAST_DEVICEINTERFACE);

  ZeroMemory(@dbi, Size);

  dbi.dbcc_size := Size;

  dbi.dbcc_devicetype := DBT_DEVTYP_DEVICEINTERFACE;

  dbi.dbcc_reserved := 0;

  dbi.dbcc_classguid  := GUID_DEVINTERFACE_USB_DEVICE;

  dbi.dbcc_name := 0;
 

  r := RegisterDeviceNotification(FWindowHandle, @dbi,

    DEVICE_NOTIFY_WINDOW_HANDLE

    );

  if Assigned(r) then Result := True;

end;
 

end.

Open in new window

0
 

Author Comment

by:MelissaCandyGirl
ID: 24151396
gimme  exemple: how to use in a timer.
0
 
LVL 18

Accepted Solution

by:
Johnjces earned 500 total points
ID: 24151462
You don't need a timer. When a pendrive, USB drive etc. is inserted or removed, it fires the appropriate event.

I.E.
 property OnUSBArrival: TNotifyEvent read FOnUSBArrival write FOnUSBArrival;
 property OnUSBRemove: TNotifyEvent read FOnUSBRemove write FOnUSBRemove;

You would install this as a component.

John
0
 

Author Closing Comment

by:MelissaCandyGirl
ID: 31570551
ok
0

Featured Post

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…
This video demonstrates how to create an example email signature rule for a department in a company using CodeTwo Exchange Rules. The signature will be inserted beneath users' latest emails in conversations and will be displayed in users' Sent Items…

747 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

7 Experts available now in Live!

Get 1:1 Help Now