我一直在努力包裝完整的WM_POWERBROADCAST
Windows消息,並將其封裝在事件驅動組件中。其中大部分工作正常,我還進一步捕獲了所有的PBT_POWERSETTINGCHANGE
setting GUID's - 除了一個GUID_POWERSCHEME_PERSONALITY
。如何從GUID_POWERSCHEME_PERSONALITY設置中獲取TGUID?
根據該文件,我應該到Data
成員翻譯爲TGUID
...
有功功率方案性格發生了變化。所有的電源方案都映射到這些人物之一。 數據成員是一個GUID,表示新的有功功率方案個性。
問題是與提供的數據類型如下:
Data: packed array[0..0] of UCHAR;
如何獲得TGUID
出這個Data
成員?
這裏是我當前如何捕捉這些設置的休息,在捕捉PBT_POWERSETTINGCHANGE
事件......
procedure TPowerMonitor.HandlePowerSetting(const Val: PPowerBroadcastSetting);
var
VDWord: DWORD;
function IsVal(G: String): Boolean;
begin
Result:= Assigned(Val);
if Result then
Result:= IsEqualGUID(StringToGUID(G), Val.PowerSetting);
end;
begin
if IsVal('{5d3e9a59-e9D5-4b00-a6bd-ff34ff516548}') then begin
//GUID_ACDC_POWER_SOURCE
VDWord:= DWORD(Val.Data[0]);
if Assigned(Self.FOnSourceChange) then
FOnSourceChange(Self, TPowerSource(VDWord));
end else
if IsVal('{a7ad8041-b45a-4cae-87a3-eecbb468a9e1}') then begin
//GUID_BATTERY_PERCENTAGE_REMAINING
VDWord:= DWORD(Val.Data[0]);
if Assigned(Self.FOnBatteryPercent) then
FOnBatteryPercent(Self, VDWord);
end else
if IsVal('{6fe69556-704a-47a0-8f24-c28d936fda47}') then begin
//GUID_CONSOLE_DISPLAY_STATE
VDWord:= DWORD(Val.Data[0]);
if Assigned(FOnConsoleDisplayState) then
FOnConsoleDisplayState(Self, TPowerDisplayState(VDWord));
end else
if IsVal('{786E8A1D-B427-4344-9207-09E70BDCBEA9}') then begin
//GUID_GLOBAL_USER_PRESENCE
VDWord:= DWORD(Val.Data[0]);
if Assigned(FOnGlobalUserPresence) then
FOnGlobalUserPresence(Self, TPowerUserPresence(VDWord));
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
VDWord:= DWORD(Val.Data[0]);
if Assigned(FOnMonitorPower) then
FOnMonitorPower(Self, TPowerDisplayState(VDWord));
end else
if IsVal('{E00958C0-C213-4ACE-AC77-FECCED2EEEA5}') then begin
//GUID_POWER_SAVING_STATUS
VDWord:= DWORD(Val.Data[0]);
if Assigned(FOnPowerSavingStatus) then
FOnPowerSavingStatus(Self, TPowerSavingStatus(VDWord));
end else
if IsVal('{245d8541-3943-4422-b025-13A784F679B7}') then begin
//GUID_POWERSCHEME_PERSONALITY
//TODO: How to read "Data" as a TGUID?
//GUID_MIN_POWER_SAVINGS (8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c)
//GUID_MAX_POWER_SAVINGS (a1841308-3541-4fab-bc81-f71556f20b4a)
//GUID_TYPICAL_POWER_SAVINGS (381b4222-f694-41f0-9685-ff5bb260df2e)
end else
if IsVal('{2B84C20E-AD23-4ddf-93DB-05FFBD7EFCA5}') then begin
//GUID_SESSION_DISPLAY_STATUS
VDWord:= DWORD(Val.Data[0]);
if Assigned(FOnSessionDisplayState) then
FOnSessionDisplayState(Self, TPowerDisplayState(VDWord));
end else
if IsVal('{3C0F4548-C03F-4c4d-B9F2-237EDE686376}') then begin
//GUID_SESSION_USER_PRESENCE
VDWord:= DWORD(Val.Data[0]);
if Assigned(FOnSessionUserPresence) then
FOnSessionUserPresence(Self, TPowerUserPresence(VDWord));
end else
if IsVal('{98a7f580-01f7-48aa-9c0f-44352c29e5C0}') then begin
//GUID_SYSTEM_AWAYMODE
VDWord:= DWORD(Val.Data[0]);
if Assigned(FOnAwayMode) then
FOnAwayMode(Self, TPowerAwayMode(VDWord));
end else begin
//Unrecognized GUID
//TODO: Handle error
end;
end;
'if(Val.DataLength> = SizeOf(TGUID))和IsEqualGUID(GUID_MIN_POWER_SAVINGS,PGUID(@ Val.Data [0])^)then ... –
@ondrej您可以有用地省略[0] –