Tag Archives: global hotkey
How to register a global hotkey for your application in C#
If you are looking for a way to set a global hotkey for your C# application that can be used without your form having focus I have created a decently commentated example for you below that you can use.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | using System; using System.Windows.Forms; namespace GlobalHotkeyExampleForm { public partial class ExampleForm : Form { [System.Runtime.InteropServices.DllImport("user32.dll")] private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk); [System.Runtime.InteropServices.DllImport("user32.dll")] private static extern bool UnregisterHotKey(IntPtr hWnd, int id); enum KeyModifier { None = 0, Alt = 1, Control = 2, Shift = 4, WinKey = 8 } public ExampleForm() { InitializeComponent(); int id = 0; // The id of the hotkey. RegisterHotKey(this.Handle, id, (int)KeyModifier.Shift, Keys.A.GetHashCode()); // Register Shift + A as global hotkey. } protected override void WndProc(ref Message m) { base.WndProc(ref m); if (m.Msg == 0x0312) { /* Note that the three lines below are not needed if you only want to register one hotkey. * The below lines are useful in case you want to register multiple keys, which you can use a switch with the id as argument, or if you want to know which key/modifier was pressed for some particular reason. */ Keys key = (Keys)(((int)m.LParam >> 16) & 0xFFFF); // The key of the hotkey that was pressed. KeyModifier modifier = (KeyModifier)((int)m.LParam & 0xFFFF); // The modifier of the hotkey that was pressed. int id = m.WParam.ToInt32(); // The id of the hotkey that was pressed. MessageBox.Show("Hotkey has been pressed!"); // do something } } private void ExampleForm_FormClosing(object sender, FormClosingEventArgs e) { UnregisterHotKey(this.Handle, 0); // Unregister hotkey with id 0 before closing the form. You might want to call this more than once with different id values if you are planning to register more than one hotkey. } } } |
Posted in C#.
Tagged C#, csharp, global hotkey, RegisterHotKey, snippet, UnregisterHotKey, winforms
