3
スレッド内からWM_POWERBROADCAST Windowsメッセージを受信する方法を理解しようとするリソースがたくさんあります。スレッド内でWM_POWERBROADCASTを受け取る方法は？
現在、私はスタンドアロンコンポーネントの内部にAllocateHWnd(WndMethod)を使用しています。標準のVCLフォームアプリケーションで上記コンポーネントのインスタンスを作成すると、すべて正常に動作し、必要に応じて毎回WM_POWERBROADCASTというメッセージが表示されます。
しかし、TThreadの中から非常に同じコンポーネントのインスタンスを作成すると、この特定のWindowsメッセージは受信されません。私はあらゆる種類の他のメッセージを受けています。このメッセージはありません。
解決策を探しているうちに、このメッセージを受け取るためにWindowsサービスがいくつかの追加作業を必要とする方法に関連する多くのリソースが見つかりました。しかし、少なくとも私はまだサービスを利用していません。私はまた、このメッセージを受け取るためにスレッドがメッセージループを持っている必要があり、私はimplemented a thread from another answer hereでしたが、この特定のメッセージを受け取ることはないということを、2人の人が分かりました。
以下は、このメッセージをどのように受け取っているかを示す完全なコンポーネントです。これは、これがVCLアプリケーションのメインスレッド内にある場合、完全に機能します。私は、メインスレッドがこのメッセージを受け取ってスレッドに転送する必要があると推測しています。
TThreadの内部には、WM_POWERBROADCASTというメッセージが表示されるようにするにはどうすればよいですか？私はWM_POWERBROADCASTが投稿されていませんので、これは私が必要なもの、実際にはないと確信しているが、前述のように、他の回答に基づいて
unit JD.Power.Monitor;
(*
JD Power Monitor
by Jerry Dodge
Purpose: To monitor the current state of power on the computer, and trigger
events when different power related changes occur.
Component: TPowerMonitor
- Create an instance of TPowerMonitor component
- Choose desired power settings to get notified of using Settings property
- Implement event handlers for those events you wish to monitor
- Component automatically takes care of the rest of the work
*)
interface
uses
System.Classes, System.SysUtils, System.Generics.Collections,
Winapi.ActiveX, Winapi.Windows, Winapi.Messages;
type
TPowerSetting = (psACDCPowerSource, psBatteryPercentage,
psConsoleDisplayState, psGlobalUserPresence, psIdleBackgroundTask,
psMonitorPower, psPowerSaving, psPowerSchemePersonality,
psSessionDisplayStatus, psSessionUserPresence, psSystemAwayMode);
TPowerSettings = set of TPowerSetting;
TPowerSource = (poAC, poDC, poHot);
TPowerDisplayState = (pdOff, pdOn, pdDimmed);
TPowerUserPresence = (puPresent = 0, puInactive = 2);
TPowerSavingStatus = (psSaverOff, psSaverOn);
TPowerAwayMode = (paExiting, paEntering);
TPowerPersonality = (ppHighPerformance, ppPowerSaver, ppAutomatic);
TPowerMonitorSettingHandles = array[TPowerSetting] of HPOWERNOTIFY;
TPowerQueryEndSessionEvent = procedure(Sender: TObject; var EndSession: Boolean) of object;
TPowerEndSessionEvent = procedure(Sender: TObject) of object;
TPowerSettingSourceChangeEvent = procedure(Sender: TObject;
const Src: TPowerSource) of object;
TPowerSettingBatteryPercentEvent = procedure(Sender: TObject;
const Perc: Single) of object;
TPowerSettingDisplayStateEvent = procedure(Sender: TObject;
const State: TPowerDisplayState) of object;
TPowerSettingUserPresenceEvent = procedure(Sender: TObject;
const Presence: TPowerUserPresence) of object;
TPowerSettingSavingEvent = procedure(Sender: TObject;
const Status: TPowerSavingStatus) of object;
TPowerAwayModeEvent = procedure(Sender: TObject;
const Mode: TPowerAwayMode) of object;
TPowerPersonalityEvent = procedure(Sender: TObject;
const Personality: TPowerPersonality) of object;
TPowerMonitor = class(TComponent)
private
FHandle: HWND;
FSettingHandles: TPowerMonitorSettingHandles;
FSettings: TPowerSettings;
FBatteryPresent: Boolean;
FOnQueryEndSession: TPowerQueryEndSessionEvent;
FOnEndSession: TPowerEndSessionEvent;
FOnPowerStatusChange: TNotifyEvent;
FOnResumeAutomatic: TNotifyEvent;
FOnResumeSuspend: TNotifyEvent;
FOnSuspend: TNotifyEvent;
FOnSourceChange: TPowerSettingSourceChangeEvent;
FOnBatteryPercent: TPowerSettingBatteryPercentEvent;
FOnConsoleDisplayState: TPowerSettingDisplayStateEvent;
FOnGlobalUserPresence: TPowerSettingUserPresenceEvent;
FOnIdleBackgroundTask: TNotifyEvent;
FOnMonitorPower: TPowerSettingDisplayStateEvent;
FOnPowerSavingStatus: TPowerSettingSavingEvent;
FOnSessionDisplayState: TPowerSettingDisplayStateEvent;
FOnSessionUserPresence: TPowerSettingUserPresenceEvent;
FOnAwayMode: TPowerAwayModeEvent;
FOnPersonality: TPowerPersonalityEvent;
procedure UnregisterSettings;
procedure RegisterSettings;
procedure SetSettings(const Value: TPowerSettings);
protected
procedure HandlePowerSetting(const Val: PPowerBroadcastSetting);
procedure WndMethod(var Msg: TMessage);
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
published
property Settings: TPowerSettings read FSettings write SetSettings;
property OnQueryEndSession: TPowerQueryEndSessionEvent
read FOnQueryEndSession write FOnQueryEndSession;
property OnEndSession: TPowerEndSessionEvent
read FOnEndSession write FOnEndSession;
property OnPowerStatusChange: TNotifyEvent
read FOnPowerStatusChange write FOnPowerStatusChange;
property OnResumeAutomatic: TNotifyEvent
read FOnResumeAutomatic write FOnResumeAutomatic;
property OnResumeSuspend: TNotifyEvent
read FOnResumeSuspend write FOnResumeSuspend;
property OnSuspend: TNotifyEvent
read FOnSuspend write FOnSuspend;
property OnSourceChange: TPowerSettingSourceChangeEvent
read FOnSourceChange write FOnSourceChange;
property OnBatteryPercent: TPowerSettingBatteryPercentEvent
read FOnBatteryPercent write FOnBatteryPercent;
property OnConsoleDisplayState: TPowerSettingDisplayStateEvent
read FOnConsoleDisplayState write FOnConsoleDisplayState;
property OnGlobalUserPresence: TPowerSettingUserPresenceEvent
read FOnGlobalUserPresence write FOnGlobalUserPresence;
property OnIdleBackgroundTask: TNotifyEvent
read FOnIdleBackgroundTask write FOnIdleBackgroundTask;
property OnMonitorPower: TPowerSettingDisplayStateEvent
read FOnMonitorPower write FOnMonitorPower;
property OnPowerSavingStatus: TPowerSettingSavingEvent
read FOnPowerSavingStatus write FOnPowerSavingStatus;
property OnSessionDisplayState: TPowerSettingDisplayStateEvent
read FOnSessionDisplayState write FOnSessionDisplayState;
property OnSessionUserPresence: TPowerSettingUserPresenceEvent
read FOnSessionUserPresence write FOnSessionUserPresence;
property OnAwayMode: TPowerAwayModeEvent
read FOnAwayMode write FOnAwayMode;
property OnPersonality: TPowerPersonalityEvent
read FOnPersonality write FOnPersonality;
end;
implementation
{ TPowerMonitor }
constructor TPowerMonitor.Create(AOwner: TComponent);
begin
inherited;
FBatteryPresent:= False;
FHandle := AllocateHWnd(WndMethod);
end;
destructor TPowerMonitor.Destroy;
begin
UnregisterSettings;
DeallocateHWnd(FHandle);
inherited;
end;
procedure TPowerMonitor.SetSettings(const Value: TPowerSettings);
begin
UnregisterSettings;
FSettings := Value;
RegisterSettings;
end;
procedure TPowerMonitor.WndMethod(var Msg: TMessage);
var
Handled: Boolean;
begin
Handled := True;
case Msg.Msg of
WM_POWERBROADCAST: begin
//TODO: Why is this never received when inside of a thread?
case Msg.WParam of
PBT_APMPOWERSTATUSCHANGE: begin
//Power status has changed.
if Assigned(FOnPowerStatusChange) then
FOnPowerStatusChange(Self);
end;
PBT_APMRESUMEAUTOMATIC: begin
//Operation is resuming automatically from a low-power state.
//This message is sent every time the system resumes.
if Assigned(FOnResumeAutomatic) then
FOnResumeAutomatic(Self);
end;
PBT_APMRESUMESUSPEND: begin
//Operation is resuming from a low-power state. This message
//is sent after PBT_APMRESUMEAUTOMATIC if the resume is triggered
//by user input, such as pressing a key.
if Assigned(FOnResumeSuspend) then
FOnResumeSuspend(Self);
end;
PBT_APMSUSPEND: begin
//System is suspending operation.
if Assigned(FOnSuspend) then
FOnSuspend(Self);
end;
PBT_POWERSETTINGCHANGE: begin
//A power setting change event has been received.
HandlePowerSetting(PPowerBroadcastSetting(Msg.LParam));
end;
else begin
end;
end;
end
else Handled := False;
end;
if Handled then
Msg.Result := 0
else
Msg.Result := DefWindowProc(FHandle, Msg.Msg,
Msg.WParam, Msg.LParam);
end;
procedure TPowerMonitor.HandlePowerSetting(const Val: PPowerBroadcastSetting);
var
Pers: TPowerPersonality;
function ValAsDWORD: DWORD;
begin
Result:= DWORD(Val.Data[0]);
end;
function ValAsGUID: TGUID;
begin
Result:= StringToGUID('{00000000-0000-0000-0000-000000000000}'); //Default
if SizeOf(TGUID) = Val.DataLength then begin
Move(Val.Data, Result, Val.DataLength);
end;
end;
function IsVal(G: String): Boolean;
begin
Result:= Assigned(Val);
if Result then
Result:= IsEqualGUID(StringToGUID(G), Val.PowerSetting);
end;
function IsValGuid(G: String): Boolean;
begin
Result:= Assigned(Val);
if Result then
Result:= IsEqualGUID(StringToGUID(G), ValAsGUID);
end;
begin
if IsVal('{5d3e9a59-e9D5-4b00-a6bd-ff34ff516548}') then begin
//GUID_ACDC_POWER_SOURCE
if Assigned(FOnSourceChange) then
FOnSourceChange(Self, TPowerSource(ValAsDWORD));
end else
if IsVal('{a7ad8041-b45a-4cae-87a3-eecbb468a9e1}') then begin
//GUID_BATTERY_PERCENTAGE_REMAINING
//We assume that if we get this message, that there is a battery connected.
//Otherwise if this never occurs, then a battery is not present.
//TODO: How to handle if battery is detached and no longer present?
FBatteryPresent:= True;
if Assigned(FOnBatteryPercent) then
FOnBatteryPercent(Self, ValAsDWORD);
end else
if IsVal('{6fe69556-704a-47a0-8f24-c28d936fda47}') then begin
//GUID_CONSOLE_DISPLAY_STATE
if Assigned(FOnConsoleDisplayState) then
FOnConsoleDisplayState(Self, TPowerDisplayState(ValAsDWORD));
end else
if IsVal('{786E8A1D-B427-4344-9207-09E70BDCBEA9}') then begin
//GUID_GLOBAL_USER_PRESENCE
if Assigned(FOnGlobalUserPresence) then
FOnGlobalUserPresence(Self, TPowerUserPresence(ValAsDWORD));
end else
if IsVal('{515c31d8-f734-163d-a0fd-11a08c91e8f1}') then begin
//GUID_IDLE_BACKGROUND_TASK
if Assigned(FOnIdleBackgroundTask) then
FOnIdleBackgroundTask(Self);
end else
if IsVal('{02731015-4510-4526-99e6-e5a17ebd1aea}') then begin
//GUID_MONITOR_POWER_ON
if Assigned(FOnMonitorPower) then
FOnMonitorPower(Self, TPowerDisplayState(ValAsDWORD));
end else
if IsVal('{E00958C0-C213-4ACE-AC77-FECCED2EEEA5}') then begin
//GUID_POWER_SAVING_STATUS
if Assigned(FOnPowerSavingStatus) then
FOnPowerSavingStatus(Self, TPowerSavingStatus(ValAsDWORD));
end else
if IsVal('{245d8541-3943-4422-b025-13A784F679B7}') then begin
//GUID_POWERSCHEME_PERSONALITY
if IsValGuid('{8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c}') then begin
Pers:= TPowerPersonality.ppHighPerformance;
end else
if IsValGuid('{a1841308-3541-4fab-bc81-f71556f20b4a}') then begin
Pers:= TPowerPersonality.ppPowerSaver;
end else
if IsValGuid('{381b4222-f694-41f0-9685-ff5bb260df2e}') then begin
Pers:= TPowerPersonality.ppAutomatic;
end else begin
//TODO: Handle unrecognized GUID
Pers:= TPowerPersonality.ppAutomatic;
end;
if Assigned(FOnPersonality) then
FOnPersonality(Self, Pers);
end else
if IsVal('{2B84C20E-AD23-4ddf-93DB-05FFBD7EFCA5}') then begin
//GUID_SESSION_DISPLAY_STATUS
if Assigned(FOnSessionDisplayState) then
FOnSessionDisplayState(Self, TPowerDisplayState(ValAsDWORD));
end else
if IsVal('{3C0F4548-C03F-4c4d-B9F2-237EDE686376}') then begin
//GUID_SESSION_USER_PRESENCE
if Assigned(FOnSessionUserPresence) then
FOnSessionUserPresence(Self, TPowerUserPresence(ValAsDWORD));
end else
if IsVal('{98a7f580-01f7-48aa-9c0f-44352c29e5C0}') then begin
//GUID_SYSTEM_AWAYMODE
if Assigned(FOnAwayMode) then
FOnAwayMode(Self, TPowerAwayMode(ValAsDWORD));
end else begin
//TODO: Handle Unrecognized GUID
end;
end;
function PowerSettingGUID(const Setting: TPowerSetting): TGUID;
begin
case Setting of
psACDCPowerSource: Result:= StringToGUID('{5d3e9a59-e9D5-4b00-a6bd-ff34ff516548}');
psBatteryPercentage: Result:= StringToGUID('{a7ad8041-b45a-4cae-87a3-eecbb468a9e1}');
psConsoleDisplayState: Result:= StringToGUID('{6fe69556-704a-47a0-8f24-c28d936fda47}');
psGlobalUserPresence: Result:= StringToGUID('{786E8A1D-B427-4344-9207-09E70BDCBEA9}');
psIdleBackgroundTask: Result:= StringToGUID('{515c31d8-f734-163d-a0fd-11a08c91e8f1}');
psMonitorPower: Result:= StringToGUID('{02731015-4510-4526-99e6-e5a17ebd1aea}');
psPowerSaving: Result:= StringToGUID('{E00958C0-C213-4ACE-AC77-FECCED2EEEA5}');
psPowerSchemePersonality: Result:= StringToGUID('{245d8541-3943-4422-b025-13A784F679B7}');
psSessionDisplayStatus: Result:= StringToGUID('{2B84C20E-AD23-4ddf-93DB-05FFBD7EFCA5}');
psSessionUserPresence: Result:= StringToGUID('{3C0F4548-C03F-4c4d-B9F2-237EDE686376}');
psSystemAwayMode: Result:= StringToGUID('{98a7f580-01f7-48aa-9c0f-44352c29e5C0}');
end;
end;
procedure TPowerMonitor.RegisterSettings;
var
V: TPowerSetting;
begin
for V := Low(TPowerSetting) to High(TPowerSetting) do begin
if V in FSettings then begin
FSettingHandles[V]:= RegisterPowerSettingNotification(FHandle,
PowerSettingGUID(V), 0);
end;
end;
end;
procedure TPowerMonitor.UnregisterSettings;
var
V: TPowerSetting;
begin
for V := Low(TPowerSetting) to High(TPowerSetting) do begin
if V in FSettings then begin
UnregisterPowerSettingNotification(FSettingHandles[V]);
end;
end;
end;
end.
は、ここでは、私だけのスレッドを使用して、このメッセージを捕獲しようとしてる方法ですメッセージ：
unit JD.ThreadTest;
interface
uses
System.Classes, Winapi.Messages, Winapi.Windows;
type
TDataThread = class(TThread)
private
FTitle: String;
FWnd: HWND;
FWndClass: WNDCLASS;
procedure HandlePower(AMsg: TMsg);
protected
procedure Execute; override;
procedure DoTerminate; override;
public
constructor Create(const Title: String); reintroduce;
end;
implementation
constructor TDataThread.Create(const Title: String);
begin
inherited Create(True);
FTitle := Title;
with FWndClass do begin
Style := 0;
lpfnWndProc := @DefWindowProc;
cbClsExtra := 0;
cbWndExtra := 0;
hInstance := HInstance;
hIcon := 0;
hCursor := LoadCursor(0, IDC_ARROW);
hbrBackground := COLOR_WINDOW;
lpszMenuName := nil;
lpszClassName := PChar(Self.ClassName);
end;
end;
procedure TDataThread.Execute;
var
Msg: TMsg;
begin
if Winapi.Windows.RegisterClass(FWndClass) = 0 then Exit;
FWnd := CreateWindow(FWndClass.lpszClassName, PChar(FTitle), WS_DLGFRAME,
0, 0, 698, 517, 0, 0, HInstance, nil);
if FWnd = 0 then Exit;
while GetMessage(Msg, FWnd, 0, 0) = True do begin
if Terminated then Break;
case Msg.message of
WM_POWERBROADCAST: begin
HandlePower(Msg); //Never receives this message
end;
else begin
TranslateMessage(msg);
DispatchMessage(msg)
end;
end;
end;
end;
procedure TDataThread.HandlePower(AMsg: TMsg);
begin
end;
procedure TDataThread.DoTerminate;
begin
if FWnd <> 0 then DestroyWindow(FWnd);
Winapi.Windows.UnregisterClass(PChar(Self.ClassName), FWndClass.hInstance);
inherited;
end;
end.
PS：最終目標は、このコンポーネントは、再使用可能にするために、サービスの内部にスポーンされるスレッドの内部にそれを使用すべきです。
EDIT
ただ、いくつかの視点を示すために、ここで私はスリープモードにコンピュータを置くとき、私の結果のスクリーンショットです。左のフォームは、私の100％働いているUIアプリケーションです。ワーカースレッドはありません。 WM_POWERBROADCASTメッセージで多数のメッセージを受信します。右の1つはスレッド内でこのメッセージをキャプチャしようとしている場所です.Remyの答えで以下のコードで更新されています。
明らかに「電源設定は、」特定のメッセージは、私はRegisterPowerSettingNotificationと呼ばれていないため、受信されません - しかし、私はまだそのようPBT_APMSUSPENDとして、かかわらず、このメッセージが表示されますときに、他の例もあります。
unit JD.ThreadTest;
interface
uses
System.Classes, System.SysUtils, Winapi.Messages, Winapi.Windows;
type
TMessageEvent = procedure(Sender: TObject; Message: TMessage) of object;
TDataThread = class(TThread)
private
FTitle: String;
FWnd: HWND;
FWndClass: WNDCLASS;
FOnMessage: TMessageEvent;
FMsg: TMessage;
procedure HandleMessage(var Message: TMessage);
protected
procedure Execute; override;
procedure DoTerminate; override;
procedure DoOnMessage;
public
constructor Create(const Title: String); reintroduce;
property OnMessage: TMessageEvent read FOnMessage write FOnMessage;
end;
implementation
function DataThreadWndProc(Wnd: HWND; Msg: UINT; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall;
var
Thread: TDataThread;
Message: TMessage;
begin
if Msg = WM_NCCREATE then
begin
Thread := TDataThread(PCREATESTRUCT(lParam)^.lpCreateParams);
SetWindowLongPtr(Wnd, GWLP_USERDATA, LONG_PTR(Thread));
end else
Thread := TDataThread(GetWindowLongPtr(Wnd, GWLP_USERDATA));
if Thread <> nil then
begin
Message.Msg := Msg;
Message.WParam := wParam;
Message.LParam := lParam;
Message.Result := 0;
Thread.HandleMessage(Message);
Result := Message.Result;
end else
Result := DefWindowProc(Wnd, Msg, wParam, lParam);
end;
constructor TDataThread.Create(const Title: String);
begin
inherited Create(True);
FTitle := Title;
with FWndClass do
begin
Style := 0;
lpfnWndProc := @DataThreadWndProc;
cbClsExtra := 0;
cbWndExtra := 0;
hInstance := HInstance;
hIcon := 0;
hCursor := LoadCursor(0, IDC_ARROW);
hbrBackground := COLOR_WINDOW;
lpszMenuName := nil;
lpszClassName := 'TDataThread';
end;
end;
procedure TDataThread.Execute;
var
Msg: TMsg;
begin
if Winapi.Windows.RegisterClass(FWndClass) = 0 then Exit;
FWnd := CreateWindow(FWndClass.lpszClassName, PChar(FTitle), WS_DLGFRAME, 0, 0, 698, 517, 0, 0, HInstance, Self);
if FWnd = 0 then Exit;
while GetMessage(Msg, 0, 0, 0) do
begin
if Terminated then Exit;
TranslateMessage(msg);
DispatchMessage(msg);
end;
end;
procedure TDataThread.DoOnMessage;
begin
if Assigned(FOnMessage) then
FOnMessage(Self, FMsg);
end;
procedure TDataThread.DoTerminate;
begin
if FWnd <> 0 then DestroyWindow(FWnd);
Winapi.Windows.UnregisterClass(FWndClass.lpszClassName, HInstance);
inherited;
end;
procedure TDataThread.HandleMessage(var Message: TMessage);
begin
FMsg:= Message;
Synchronize(DoOnMessage);
case Message.Msg of
WM_POWERBROADCAST:
begin
end;
else
Message.Result := DefWindowProc(FWnd, Message.Msg, Message.WParam, Message.LParam);
end;
end;
end.
ちょっとしたアイデア：RegisterPowerSettingNotificationを呼び出すときに正しいハンドルを使用していますか？すなわち、 **ウィンドウハンドル**はスレッドハンドルではなくAllocateHwndによって返されますか？ –
@OndrejKelle私はこのコンポーネントのためだけに割り当てられた同じハンドルを使用しています。コンポーネントには、ワーカースレッドの内部にあるかどうかは認識されません。 –
MCVEを作成していないため、関連するコードが表示されません。代わりに無関係なコードを表示しました。あなたは今、もっとよく知っておくべきです。メッセージを送信するコードはどこですか？スレッド内のメッセージが確実に送信されるコード。これを読んでください：[mcve] –