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[NicoDE]

Die Nachricht wird nicht versendet, wenn die Benachrichtung über Laufwerksänderungen deaktiviert wurde (ich nehmen an, dass Du sie deaktiviert hast).
Versuche folgendes (nur Windows):

Delphi-Quellcode:

unit Unit1;

interface

uses
  Windows, Messages, Classes, Controls, Forms, StdCtrls, SysUtils, ExtCtrls;

type
  PWmDeviceChange = ^TWmDeviceChange;
  TWmDeviceChange = packed record
    Msg   : UINT;
    Event : WPARAM;
    Data  : LPARAM;
    Result: LRESULT;
  end;

type
  PVolumeInfo = ^TVolumeInfo;
  TVolumeInfo = packed record
    Type_ : UINT;
    Name  : array [0..4095] of Char;
    Serial: DWORD;
  end;
  PVolumeInfoArray = ^TVolumeInfoArray;
  TVolumeInfoArray = array ['C'..'Z'] of TVolumeInfo;

type
  TMainForm = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Timer1: TTimer;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure DefaultHandler(var Message); override;
    procedure WmDeviceChange(var Message: TWmDeviceChange);
      message WM_DEVICECHANGE;
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
    WM_QUERY_CANCEL_AUTOPLAY: UINT;
    VolumeInfos: TVolumeInfoArray;
  public
    { Public declarations }
  end;

var
  MainForm: TMainForm;

implementation

{$R *.dfm}

procedure TMainForm.FormCreate(Sender: TObject);
begin
  WM_QUERY_CANCEL_AUTOPLAY := 0;
  ZeroMemory(@VolumeInfos, SizeOf(VolumeInfos));
end;

procedure TMainForm.Button1Click(Sender: TObject);
begin
  Memo1.Clear();
end;

////////////////////////////////////////////////////////////////////////////////
// AutoPlay

procedure TMainForm.DefaultHandler(var Message);
begin
  // Shell version >= 4.70, AutoPlay enabled, and Form1 is the foreground window
  if (WM_QUERY_CANCEL_AUTOPLAY = 0) then
      WM_QUERY_CANCEL_AUTOPLAY := RegisterWindowMessage('QueryCancelAutoPlay');
  if (WM_QUERY_CANCEL_AUTOPLAY = TMessage(Message).Msg) then
  begin
    TMessage(Message).Result := S_FALSE;  // S_OK = cancel AutoPlay
    Memo1.Lines.Add('[AutoPlay]');
  end;
  inherited;
end;

////////////////////////////////////////////////////////////////////////////////
// DeviceChange

procedure TMainForm.WmDeviceChange(var Message: TWmDeviceChange);
const
  DBT_DEVICEARRIVAL        = $8000;  // system detected a new device
  DBT_DEVICEREMOVECOMPLETE = $8004;  // device is gone
begin
  case Message.Event of
    DBT_DEVICEARRIVAL:
      Memo1.Lines.Add('[DeviceChange] DBT_DEVICEARRIVAL');
    DBT_DEVICEREMOVECOMPLETE:
      Memo1.Lines.Add('[DeviceChange] DBT_DEVICEARRIVAL');
  else
    Memo1.Lines.Add('[DeviceChange] ' + IntToHex(Message.Event, 8));
  end;
  Message.Result := LRESULT(TRUE);  // BROADCAST_QUERY_DENY = deny the request
  inherited;
end;

////////////////////////////////////////////////////////////////////////////////
// Timer

procedure TMainForm.Timer1Timer(Sender: TObject);
var
  PrevErrorMode: UINT;
  RootPathName: array [0..4] of Char;
  CurrentDrive: Char;
  VolumeInfo: TVolumeInfo;
  MaxCompLen: DWORD;
  FSystFlags: DWORD;
begin
  Timer1.Enabled := False;
  PrevErrorMode := UINT(-1);
  try
    PrevErrorMode := SetErrorMode(SEM_FAILCRITICALERRORS);
    SetErrorMode(PrevErrorMode or SEM_FAILCRITICALERRORS);
    RootPathName := '_:\'#0;
    for CurrentDrive := 'C' to 'Z' do  // Char(Low|High(TVolumeInfo.Name))
    begin
      RootPathName[0] := CurrentDrive;
      ZeroMemory(@VolumeInfo, SizeOf(VolumeInfo));
      VolumeInfo.Type_ := GetDriveType(RootPathName);
      GetVolumeInformation(RootPathName, VolumeInfo.Name,
        SizeOf(VolumeInfo.Name) div SizeOf(VolumeInfo.Name[0]),
        @VolumeInfo.Serial, MaxCompLen, FSystFlags, nil, 0);
      if (VolumeInfo.Type_ <> VolumeInfos[CurrentDrive].Type_) or
        (StrComp(VolumeInfo.Name, VolumeInfos[CurrentDrive].Name) <> 0) or
        (VolumeInfo.Serial <> VolumeInfos[CurrentDrive].Serial)then
      begin
         Memo1.Lines.Add('[Timer] ' + RootPathName + ', ' + VolumeInfo.Name +
           ', ' + IntToHex(VolumeInfo.Serial, 8));
      end;
      VolumeInfos[CurrentDrive] := VolumeInfo;
    end;
  finally
    if (PrevErrorMode <> UINT(-1)) then
      SetErrorMode(PrevErrorMode);
    if (Timer1.Tag = 0) then
      Timer1.Enabled := True;
  end;
end;

Gruss Nico