I've found several snippets and .pas files that can detect when USB flash drives are inserted and removed. Some give all kind of good information, however what I need is the devices' unique serial number, not the volumes' serial number.
My current .pas file (which I don't remember where I found) also seems to detect SD cards (which I like). If you want a look, you can find it here (it only returns the drive number and inserted/removed):
unit UsbDetector;
interface
uses Classes;
type
TUsbDriveChanged = procedure (Sender: TObject; Drive: string; Attached: boolean) of object;
procedure StartUsbDetector(NotifyProc: TUsbDriveChanged);
procedure StopUsbDetector;
implementation
uses Windows, Messages, Forms, SysUtils;
type
TUSBDetector = class(TObject)
private
fUsbDriveChanged: TUsbDriveChanged;
protected
procedure DeviceChanged(Msg: UINT; wParam, lParam: Longint);
procedure DoUsbDriveChanged(Drive: string; Attached: Boolean); dynamic;
public
constructor Create(NotifyProc: TUsbDriveChanged);
destructor Destroy; override;
property OnUsbDriveChanged: TUsbDriveChanged read fUsbDriveChanged;
end;
var mUSBDetector: TUSBDetector;
procedure StartUsbDetector(NotifyProc: TUsbDriveChanged);
begin
if not Assigned(mUsbDetector) then
mUsbDetector := TUsbDetector.Create(NotifyProc);
end;
procedure StopUsbDetector;
begin
FreeAndNil(mUsbDetector);
end;
{----------------------------------------------------------------------------}
// Device constants
const
DBT_DEVICEARRIVAL = $00008000;
DBT_DEVICEREMOVECOMPLETE = $00008004;
DBT_DEVTYP_VOLUME = $00000002;
// Device structs
type
_DEV_BROADCAST_HDR = packed record
dbch_size: DWORD;
dbch_devicetype: DWORD;
dbch_reserved: DWORD;
end;
DEV_BROADCAST_HDR = _DEV_BROADCAST_HDR;
TDevBroadcastHeader = DEV_BROADCAST_HDR;
PDevBroadcastHeader = ^TDevBroadcastHeader;
type
_DEV_BROADCAST_VOLUME = packed record
dbch_size: DWORD;
dbch_devicetype: DWORD;
dbch_reserved: DWORD;
dbcv_unitmask: DWORD;
dbcv_flags: WORD;
end;
DEV_BROADCAST_VOLUME = _DEV_BROADCAST_VOLUME;
TDevBroadcastVolume = DEV_BROADCAST_VOLUME;
PDevBroadcastVolume = ^TDevBroadcastVolume;
var
fPrevWndProc: TFNWndProc = nil;
function UsbWndProc(hWnd: HWND; Msg: UINT; wParam, lParam: Longint): Longint; stdcall;
begin
Result := CallWindowProc(fPrevWndProc, hWnd, Msg, wParam, lParam);
if (Msg = WM_DEVICECHANGE) and (mUsbDetector <> nil) then
mUsbDetector.DeviceChanged(Msg, wParam, lParam);
end;
constructor TUSBDetector.Create(NotifyProc: TUsbDriveChanged);
begin
inherited Create;
fUsbDriveChanged := NotifyProc;
if not Assigned(fPrevWndProc) then
begin
fPrevWndProc := TFNWndProc(GetWindowLong(Application.Handle, GWL_WNDPROC));
SetWindowLong(Application.Handle, GWL_WNDPROC, LongInt(@UsbWndProc));
end;
end;
destructor TUSBDetector.Destroy;
begin
//SetWindowLong(Application.Handle, GWL_WNDPROC, LongInt(@fPrevWndProc));
inherited Destroy;
end;
procedure TUSBDetector.DeviceChanged(Msg: UINT; wParam, lParam: LongInt);
var
lpdbhHeader: PDevBroadcastHeader;
lpdbvData: PDevBroadcastVolume;
dwIndex: Integer;
lpszDrive: string;
begin
// Get the device notification header
lpdbhHeader := PDevBroadcastHeader(lParam);
// Handle the message
lpszDrive := '';
case WParam of
DBT_DEVICEARRIVAL: {a USB drive was connected}
begin
if lpdbhHeader^.dbch_devicetype = DBT_DEVTYP_VOLUME then
begin
lpdbvData := PDevBroadcastVolume(lParam);
for dwIndex := 0 to 25 do
begin
if (lpdbvData^.dbcv_unitmask shr dwIndex) = 1 then
begin
lpszDrive := lpszDrive + Chr(65 + dwIndex) + ':\';
break;
end;
end;
DoUsbDriveChanged(lpszDrive, True);
end;
end;
DBT_DEVICEREMOVECOMPLETE: {a USB drive was removed}
begin
if lpdbhHeader^.dbch_devicetype = DBT_DEVTYP_VOLUME then
begin
lpdbvData := PDevBroadcastVolume(lParam);
for dwIndex := 0 to 25 do
begin
if (lpdbvData^.dbcv_unitmask shr dwIndex) = 1 then
begin
lpszDrive := lpszDrive + Chr(65 + dwIndex) + ':\';
break;
end;
end;
DoUsbDriveChanged(lpszDrive, False);
end;
end;
end;
end;
procedure TUSBDetector.DoUsbDriveChanged(Drive: string; Attached: Boolean);
begin
if Assigned(fUsbDriveChanged) then
fUsbDriveChanged(Self, Drive, Attached);
end;
end.
P.S. The code highlight is fail.
All in all; When a removable is inserted/removed, get drive letter and its unique serial number. Maybe combine the already given code with a WMI call "where Index=found_index".
**EDIT!** I removed the "where" clause in the code given by PRUZ. I finally found out how to handle the arrays, so I use that to find Capabilities[i]=7 to get all removable media. Now I just need to connect this code with the above code. I am thinking using Index, but I don't know how to use GetDrive MapInfo. If you could provide me with an example on getting the drive letter, my question is solved.