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cepowerman.pas
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cepowerman.pas
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{
* CePowerMan - WinCE Powermanger API
* Copyright (c)2007 Adrian Veith
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
}
unit CePowerMan;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Windows, syncobjs;
const
POWER_STATE_MASK = $FFFF0000; // power state mask
POWER_STATE_ON = $00010000; // on state
POWER_STATE_OFF = $00020000; // no power, full off
POWER_STATE_CRITICAL = $00040000; // critical off
POWER_STATE_BOOT = $00080000; // boot state
POWER_STATE_IDLE = $00100000; // idle state
POWER_STATE_SUSPEND = $00200000; // suspend state
POWER_STATE_RESET = $00800000; // reset state
PBT_TRANSITION = $00000001; // broadcast specifying system power state transition
PBT_RESUME = $00000002; // broadcast notifying a resume, specifies previous state
PBT_POWERSTATUSCHANGE = $00000004; // power supply switched to/from AC/DC
PBT_POWERINFOCHANGE = $00000008; // some system power status field has changed
// OEMS may define power notifications starting with this ID and
// going up by powers of 2.
PBT_OEMBASE = $00010000;
// This bitmask indicates that an application would like to receive all
// types of power notifications.
POWER_NOTIFY_ALL = $FFFFFFFF;
MSGQUEUE_NOPRECOMMIT = $00000001;
MSGQUEUE_ALLOW_BROKEN = $00000002;
MSGQUEUE_MSGALERT = $00000001;
type
MSGQUEUEOPTIONS = record
dwSize: DWORD;
dwFlags: DWORD;
dwMaxMessages: DWORD;
cbMaxMessage: DWORD;
bReadAccess: BOOL;
end;
PMSGQUEUEOPTIONS = ^MSGQUEUEOPTIONS;
TMSGQUEUEOPTIONS = MSGQUEUEOPTIONS;
POWER_BROADCAST = record
Message: DWORD;
Flags: DWORD;
Length: DWORD;
SystemPowerState: array[0..0] of WCHAR;
end;
PPOWER_BROADCAST = ^POWER_BROADCAST;
TPOWER_BROADCAST = POWER_BROADCAST;
CEDEVICE_POWER_STATE = ( PwrDeviceUnspecified = -1,
D0 = 0,
D1,
D2,
D3,
D4,
PwrDeviceMaximum);
PCEDEVICE_POWER_STATE = ^CEDEVICE_POWER_STATE;
TCEDEVICE_POWER_STATE = CEDEVICE_POWER_STATE;
POWER_BROADCAST_POWER_INFO = record
dwBatteryLifeTime: DWORD;
dwBatteryFullLifeTime: DWORD;
dwBackupBatteryLifeTime: DWORD;
dwBackupBatteryFullLifeTime: DWORD;
bACLineStatus: BYTE;
bBatteryFlag: BYTE;
bBatteryLifePercent: BYTE;
bBackupBatteryFlag: BYTE;
bBackupBatteryLifePercent: BYTE;
end;
PPOWER_BROADCAST_POWER_INFO = ^POWER_BROADCAST_POWER_INFO;
TPOWER_BROADCAST_POWER_INFO = POWER_BROADCAST_POWER_INFO;
TPowerNotify = procedure(var ABroadcast: TPOWER_BROADCAST; var AInfo: TPOWER_BROADCAST_POWER_INFO; AInfoIsValid: Boolean) of object;
TPowerLogEvent = procedure(const AMess: string) of object;
{ TPowerMessageThread }
TPowerMessageThread = class(TThread)
private
FMsgQueue: HANDLE;
FEventStop: THandle;
FHandleMsg: HANDLE;
FOnLogEvent: TPowerLogEvent;
FOnPowerMessage: TPowerNotify;
FBroadcast: TPOWER_BROADCAST;
FInfo: TPOWER_BROADCAST_POWER_INFO;
FInfoIsValid: Boolean;
protected
procedure Execute; override;
procedure DoTerminate; override;
procedure ReadPowerMessage(AQue: THANDLE);
procedure CallPowerMessage;
procedure Log(const AMess: string);
public
constructor Create(ANotify: TPowerNotify);
destructor Destroy; override;
property OnPowerMessage: TPowerNotify read FOnPowerMessage write FOnPowerMessage;
property OnLogEvent: TPowerLogEvent read FOnLogEvent write FOnLogEvent;
end;
function RequestPowerNotifications(hMsgQ: HANDLE; Flags: DWORD): HANDLE; external KernelDLL name 'RequestPowerNotifications';
function StopPowerNotifications(h: HANDLE): BOOL; external KernelDLL name 'StopPowerNotifications';
function CreateMsgQueue(lpszName: LPCWSTR; var lpOptions: TMSGQUEUEOPTIONS): HANDLE; external KernelDLL name 'CreateMsgQueue';
function ReadMsgQueue(hMsgQ: HANDLE; lpBuffer: LPVOID; cbBufferSize: DWORD; var lpNumberOfBytesRead: DWORD; dwTimeout: DWORD; var pdwFlags: DWORD): BOOL; external KernelDLL name 'ReadMsgQueue';
function CloseMsgQueue(hMsgQ: HANDLE): BOOL; external KernelDLL name 'CloseMsgQueue';
function CeRunAppAtTime(pwszAppName: LPCWSTR; pTime: PSYSTEMTIME): BOOL; external KernelDLL name 'CeRunAppAtTime';
implementation
{ TPowerMessageThread }
procedure TPowerMessageThread.Execute;
var
Msg: TMsg;
WaitHandles : array[0..1] of THandle;
hQue: THANDLE;
QueOpt: TMSGQUEUEOPTIONS;
begin
QueOpt.dwSize:= sizeof(TMSGQUEUEOPTIONS);
QueOpt.dwFlags:= 0; //MSGQUEUE_NOPRECOMMIT;
QueOpt.dwMaxMessages:= 20;
QueOpt.cbMaxMessage:= 1024;
QueOpt.bReadAccess:= True;
try
hQue:= CreateMsgQueue('PowerMsgQ', QueOpt);
try
//CallPowerMessage;
while not Terminated do begin
{if WaitForSingleObject(FMsgQueue, 1000) = 0 then begin
ReadPowerMessage(hQue);
end;}
WaitHandles[1]:= FEventStop;
WaitHandles[0]:= FMsgQueue;
case MsgWaitForMultipleObjects(2, @WaitHandles, False, INFINITE, QS_SENDMESSAGE) of
WAIT_OBJECT_0 + 1: begin
Terminate;
end;
WAIT_OBJECT_0 + 0: begin
ReadPowerMessage(hQue);
end;
WAIT_OBJECT_0+2:
PeekMessage(Msg, 0, 0, 0, PM_NOREMOVE)
end;
//CallPowerMessage;
end;
finally
CloseHandle(hQue);
end;
except
end;
end;
procedure TPowerMessageThread.DoTerminate;
begin
inherited DoTerminate;
end;
procedure TPowerMessageThread.ReadPowerMessage(AQue: THANDLE);
var
buffer: array[0..1023] of byte;
readBytes, readFlags: DWORD;
pBroadcast: PPOWER_BROADCAST;
begin
if ReadMsgQueue(AQue, @buffer[0], sizeof(buffer), readBytes, 500, readFlags)
then begin
pBroadcast:= @buffer[0];
if Assigned(FOnPowerMessage) then begin
FBroadcast:= pBroadcast^;
FInfoIsValid:= (pBroadcast^.Flags AND PBT_POWERINFOCHANGE <> 0) AND (pBroadcast^.Length = sizeof(POWER_BROADCAST_POWER_INFO));
if FInfoIsValid then
FInfo:= PPOWER_BROADCAST_POWER_INFO(@pBroadcast^.SystemPowerState)^;
CallPowerMessage;
//Synchronize(@CallPowerMessage);
end;
end;
end;
procedure TPowerMessageThread.CallPowerMessage;
begin
if Assigned(FOnPowerMessage) then
FOnPowerMessage(FBroadcast, FInfo, FInfoIsValid);
end;
procedure TPowerMessageThread.Log(const AMess: string);
begin
if Assigned(FOnLogEvent) then
FOnLogEvent(AMess);
end;
constructor TPowerMessageThread.Create(ANotify: TPowerNotify);
var
QueOpt: TMSGQUEUEOPTIONS;
begin
QueOpt.dwSize:= sizeof(TMSGQUEUEOPTIONS);
QueOpt.dwFlags:= 0; //MSGQUEUE_NOPRECOMMIT;
QueOpt.dwMaxMessages:= 20;
QueOpt.cbMaxMessage:= 1024;
QueOpt.bReadAccess:= False;
FMsgQueue:= CreateMsgQueue('PowerMsgQ', QueOpt);
FEventStop:= CreateEvent(nil, False, False, nil);
FHandleMsg:= RequestPowerNotifications(FMsgQueue, PBT_TRANSITION);
OnPowerMessage:= ANotify;
inherited Create(False);
end;
destructor TPowerMessageThread.Destroy;
begin
Terminate;
Windows.SetEvent(FEventStop);
inherited Destroy;
StopPowerNotifications(FHandleMsg);
CloseHandle(FMsgQueue);
CloseHandle(FEventStop);
end;
end.