How to get power key current state pressed or not in C#

Question

How to get power key current state pressed or not in C#

Sachi 221

I am creating WinUI3 app i want to handle some events.

how to know whether power key status of pressed or not

I want to avoid the condition to go inside if the power key pressed.

please suggest.

Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff

2023-03-07T02:11:42.3266667+00:00

Does PowerManager work for you? Or you may need Shutdown Notifications. Could you please show more detail about your condition?
Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff

2023-03-17T02:21:44.1833333+00:00

Hello @Sachi, Any update?
Sachi 221 Reputation points

2023-03-20T11:39:26.09+00:00

Hi Team,

I want to handle the situation in C# where the power button is pressed for a long time

could you please suggest how will i know whether the user has pressed the power key for a long time?
Sachi 221 Reputation points

2023-03-24T08:03:21.4733333+00:00

Hi Team,

Any suggestions on above issue?
Castorix31 90,686 Reputation points

2023-03-25T08:58:45.4766667+00:00

I don't have any "power key" button on my keyboard to test, but when you press it, did you check if they are WM_* messages sent to your app (main window handle) with Spy++ ?
Sachi 221 Reputation points

2023-03-27T05:03:27.8733333+00:00

Hi @Castorix31

Thank you for the reply

No i was not aware of WM_ messages sent to your app (main window handle) with Spy++*

can you be more specific on this?

when i press power key button i am capturing the event it sending 3 Virtual keys(not together) it's sends one by one key i am unable to identify when power key pressed or its state change

because i am having one more key with same virtual key(as power key) so i want to avoid power key pressed event

please suggest something to get power key state change

Thanks
Castorix31 90,686 Reputation points

2023-03-27T08:27:53.45+00:00

No i was not aware of WM_ messages sent to your app (main window handle) with Spy++* can you be more specific on this?

I meant to watch messages sent to your app when this button is pressed, with MS Spy++ tool

Same thing as this test with Notepad (mouse messages) :

1 answer

Your answer

Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff

2023-03-07T02:11:42.3266667+00:00

Does PowerManager work for you? Or you may need Shutdown Notifications. Could you please show more detail about your condition?
Xiaopo Yang - MSFT 12,731 Reputation points Microsoft External Staff

2023-03-17T02:21:44.1833333+00:00

Hello @Sachi, Any update?
Sachi 221 Reputation points

2023-03-20T11:39:26.09+00:00

Hi Team,

I want to handle the situation in C# where the power button is pressed for a long time

could you please suggest how will i know whether the user has pressed the power key for a long time?
Sachi 221 Reputation points

2023-03-24T08:03:21.4733333+00:00

Hi Team,

Any suggestions on above issue?
Castorix31 90,686 Reputation points

2023-03-25T08:58:45.4766667+00:00

I don't have any "power key" button on my keyboard to test, but when you press it, did you check if they are WM_* messages sent to your app (main window handle) with Spy++ ?
Sachi 221 Reputation points

2023-03-27T05:03:27.8733333+00:00

Hi @Castorix31

Thank you for the reply

No i was not aware of WM_ messages sent to your app (main window handle) with Spy++*

can you be more specific on this?

when i press power key button i am capturing the event it sending 3 Virtual keys(not together) it's sends one by one key i am unable to identify when power key pressed or its state change

because i am having one more key with same virtual key(as power key) so i want to avoid power key pressed event

please suggest something to get power key state change

Thanks
Castorix31 90,686 Reputation points

2023-03-27T08:27:53.45+00:00

No i was not aware of WM_ messages sent to your app (main window handle) with Spy++* can you be more specific on this?

I meant to watch messages sent to your app when this button is pressed, with MS Spy++ tool

Same thing as this test with Notepad (mouse messages) :

Answer 1

Xiaopo Yang - MSFT 12,731 Microsoft External Staff

Hello @Sachi , according to Shutdown Notifications, which concentrates on shutting down, you can use the WM_QUERYENDSESSION and WM_ENDSESSION messages to receive shutdown notifications instead of checking the state of power key. I have tested that the messages work fine.

For how to use the messages with WinUI3, see @Castorix31 's example.

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How to get power key current state pressed or not in C#

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