Hi Team, We have requirement to write class library to fire(invoke) an event when any hot key is pressed. We will subscribe to that event from two application(one is wpf application and also from winui3 application). Senarios. Class library to invoke the event when any of the hot key is pressed. WPF app will subscribe to that event, we ll get notified when hot key is pressed. WinUI3 app also will subscribe to that event, we ll get notified when hot key is pressed. Note : we should have functionality like ManagementEventWatcher(notifies when process starts and process stops). Best Regards, Sunil

Hello, Welcome to Microsoft Q&A! Applications can define keyboard shortcuts using Accelerator Tables for themselves Or define a system-wide hot key using RegisterHotKey except System has some hot keys. You can use SetWindowsHookEx to hook any hot key which you are interested in. Thank you. If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Need classlibary to raise an event or fire an event when any of the hot key is pressed.

Sunil A M 171

Hi Team,

We have requirement to write class library to fire(invoke) an event when any hot key is pressed.
We will subscribe to that event from two application(one is wpf application and also from winui3 application).
Senarios.

Class library to invoke the event when any of the hot key is pressed.
WPF app will subscribe to that event, we ll get notified when hot key is pressed.
WinUI3 app also will subscribe to that event, we ll get notified when hot key is pressed.

Note : we should have functionality like ManagementEventWatcher(notifies when process starts and process stops).

Best Regards,
Sunil

Xiaopo Yang - MSFT 11,501 Reputation points Microsoft Vendor

2022-08-01T06:53:09.013+00:00

What do you mean hot key? Do you want to capture all Application hot key and System-Wide hot key?
Could you please provide more information about the context? If you want a .NetAPI solution(classlibary), Perhaps windows-app-sdk is not suitable.

1 answer

Xiaopo Yang - MSFT 11,501 Reputation points Microsoft Vendor

2022-08-01T02:21:50.843+00:00

Hello,

Welcome to Microsoft Q&A!

Applications can define keyboard shortcuts using Accelerator Tables for themselves Or define a system-wide hot key using RegisterHotKey except System has some hot keys. You can use SetWindowsHookEx to hook any hot key which you are interested in.

Thank you.

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
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Sunil A M 171 Reputation points

2022-08-01T07:19:54.713+00:00

Hi,

Thanks for the reply.
Now i have downloaded the hot key class library project from the link below.
https://github.com/mrousavy/Hotkeys/tree/master/Hotkeys

Now what we want is - our above class library should get notified when the hot key is pressed(Not through the wpf App).
then our wpf application will subscribe to the above class library event and consume it.

Class library - Publisher - Notfiy when hok key pressed. - Event Invoke
WPF app - Subscribing to the above event and act.

Best Regards,
Sunil

Xiaopo Yang - MSFT 11,501 Reputation points Microsoft Vendor

2022-08-01T07:37:47.34+00:00

As the Usage said, Using the fourth parameter onKeyAction and the callback is based on WM_HOTKEY.

Sunil A M 171 Reputation points

2022-08-03T09:57:21.43+00:00

Hi

how i want is..

Class library project should listen to hot key pressed - invoke the event when hot key is pressed

Wpf app will subscribe to above class library event and get notification when hot key is pressed.

Xiaopo Yang - MSFT 11,501 Reputation points Microsoft Vendor

2022-08-04T01:19:48.923+00:00

After loading the library, you can use like such in your Wpf app.

using mrousavy; // ... var key = new HotKey( (ModifierKeys.Control | ModifierKeys.Alt), Key.S, this, (hotkey) => { MessageBox.Show("Ctrl + Alt + S was pressed!"); //your event code here } //this parameter subscribe to the class library event, when hot key is pressed, the lambda will be invoked. ); // ... key.Dispose();
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