How To Create Keyboard Shortcut Keys in C# Part 3 | Create Global Hotkeys Using RegisterHotKey API

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Welcome to, C# Tutorial
Keyboard Shortcut keys handling Series.

There are many ways to implement Keyboard Shortcut keys using c#, each comes with its own set of pros and cons. We will be looking at various techniques during this 4 parts series.


How To implement Keyboard Shortcut keys using C# Part 3
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In the Part 1
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https://www.youtube.com/watch?v=dV-ockUtYT0

of this series we have discussed, how to Create Keyboard Shortcut keys using Forms KeyDown event

In The Part 2
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https://youtu.be/_ozMnmxjV2s

of this series we have seen how to capture shortcut keys by overriding forms ProcessCmdKey function.

In This Part#3

We will see how to create global hotkeys/Keyboard shortcut keys for our application using windows Api RegisterHotKey function. Even when application is not Focused/Activated or in Background application will still respond to registered HotKey.

- we will be creating a libHotKey a library which can be utilized by any .net application for registering global hotkeys.

-we will learn how to register, unregister and replace already registered hotkey
-we will learn what is singleton design pattern
-we will learn what is Action Delegate in C#

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Source Code: https://github.com/Programminghowtoyt/Keyboard-Shortcut-How-to


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Updates: Some corrections
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HotKeyController constructor should be private
private HotKeyController()
{
window = new MessageListenerWindow(this);
windowHandle = window.Handle;
}


define int id = 1; as global parameter in hotkeycontroller



and When Registering the hotkey instantiate it using that parameter
new HotKey() { Purpose = Purpose, id = id, fsModifiers = modifiers, vk = vk, OnPressed = OnPressed };

increment the id after the following line

RegisteredHotKeys.Add(key);
id++;

Code On Github have that update already.

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