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    <p>Here part of code that detect when laptop is running on batteries (if not it triggers some event):</p> <pre><code>uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, WTSSessionNotification, StdCtrls, MediaPlayer, Buttons, ShellAPI, Settings, ExtCtrls; const WM_ICONTRAY = WM_USER + 1; type TSettingsForm = class(TForm) OpenDialog: TOpenDialog; pnl1: TPanel; InfoLabel: TLabel; grp1: TGroupBox; AlarmSoundLabel: TLabel; lbl1: TLabel; checkIfLocked: TCheckBox; Filename: TEdit; Browse: TBitBtn; TestSound: TBitBtn; btn1: TBitBtn; lbl2: TLabel; procedure Minimize(Sender: TObject); procedure FormCreate(Sender: TObject); procedure FormDestroy(Sender: TObject); procedure TestSoundClick(Sender: TObject); procedure BrowseClick(Sender: TObject); procedure checkIfLockedClick(Sender: TObject); procedure OpenHomepage(Sender: TObject); procedure btn1Click(Sender: TObject); private TrayIconData: TNotifyIconData; procedure CheckForAC; protected procedure WndProc(var Message: TMessage); override; public { Public declarations } Function SecuredLockWorkStation : Boolean ; end; var SettingsForm: TSettingsForm; implementation {$R *.DFM} {$R WindowsXP.RES} var MPlayer: TMPlayer; mySettings: TSettings; isLocked: boolean = false; // true if A/C is connected, false if not function ACConnected: boolean; var PowerStatus: TSystemPowerStatus; begin GetSystemPowerStatus(PowerStatus); result := (PowerStatus.ACLineStatus = 1); end; // handles application.minimize; do not really // minimize, but hide settings window procedure TSettingsForm.Minimize(Sender: TObject); begin Application.Restore; self.Hide; end; // processes window messages (notification about // power status changes, locking of workstation and // tray icon activity) procedure TSettingsForm.WndProc(var Message: TMessage); begin case Message.Msg of WM_WTSSESSION_CHANGE: begin if Message.wParam = WTS_SESSION_LOCK then isLocked := true; if Message.wParam = WTS_SESSION_UNLOCK then begin isLocked := false; if MPlayer.isPlaying then MPlayer.Close; end; end; WM_POWERBROADCAST: begin if (isLocked) or (checkIfLocked.checked=false) then CheckForAC; end; WM_ICONTRAY: begin case Message.lParam of WM_LBUTTONDOWN: begin if SettingsForm.visible then SettingsForm.Hide else SettingsForm.Show; end; WM_RBUTTONUP: begin if SettingsForm.visible then SettingsForm.Hide else SettingsForm.Close; end; end; end; end; inherited; end; </code></pre>
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