C Global hotkey Settings and form hotkey Settings instance
- 2020-11-20 06:12:47
- OfStack
This article describes the example of C# global hotkey Settings and form hotkey Settings, to share for your reference. Specific implementation methods are as follows:
1. Form hotkeys
First, set the main form KeyPreview to true, which can be set directly in the properties,
Or set in form loading: this. KeyPreview = true;
Then add the Form KeyDown event as follows:
private void FrmMain_KeyDown(object sender, KeyEventArgs e)
{
if (e.Alt && e.Shift && e.Control && e.KeyCode == Keys.S)
{
MessageBox.Show(" I pressed the Control +Shift +Alt +S");
}
}2. Global hotkey setting
Define API function register hotkeys uninstall hotkeys
I have defined the AppHotKey class here, with all the code as follows:
public class AppHotKey
{
[DllImport("kernel32.dll")]
public static extern uint GetLastError();
// If the function executes successfully, the return value is not 0 .
// If the function fails, the return value is 0 . To get the extension error message, call GetLastError .
[DllImport("user32.dll", SetLastError = true)]
public static extern bool RegisterHotKey(
IntPtr hWnd, // Handle to the window to define the hotkey
int id, // Define hotkeys ID (Not with others ID Repeated)
KeyModifiers fsModifiers, // Identifies whether the hotkey is being pressed Alt , Ctrl , Shift , Windows It doesn't take effect until you wait for the key
Keys vk // Define the contents of the hotkey
);
[DllImport("user32.dll", SetLastError = true)]
public static extern bool UnregisterHotKey(
IntPtr hWnd, // Handle to the window to cancel the hotkey
int id // You want to cancel hotkeys ID
);
// Defines the name of the secondary key (converts a number to a character for memorization, or USES a numeric value instead of an enumeration)
[Flags()]
public enum KeyModifiers
{
None = 0,
Alt = 1,
Ctrl = 2,
Shift = 4,
WindowsKey = 8
}
/// <summary>
/// Registered hotkey
/// </summary>
/// <param name="hwnd"> Handle to the window </param>
/// <param name="hotKey_id"> hotkey ID</param>
/// <param name="keyModifiers"> The composite key </param>
/// <param name="key"> hotkey </param>
public static void RegKey(IntPtr hwnd, int hotKey_id, KeyModifiers keyModifiers, Keys key)
{
try
{
if (!RegisterHotKey(hwnd, hotKey_id, keyModifiers, key))
{
if (Marshal.GetLastWin32Error() == 1409) { MessageBox.Show(" Hotkeys are occupied ! "); }
else
{
MessageBox.Show(" Failed to register hotkey! ");
}
}
}
catch (Exception) { }
}
/// <summary>
/// The cancellation of hot keys
/// </summary>
/// <param name="hwnd"> Handle to the window </param>
/// <param name="hotKey_id"> hotkey ID</param>
public static void UnRegKey(IntPtr hwnd, int hotKey_id)
{
// The cancellation Id Number is hotKey_id Hotkey Settings
UnregisterHotKey(hwnd, hotKey_id);
}
}Overwrite the WndProc function of the form, register the hotkey when the window is created, and destroy the hotkey when the window is destroyed, the code is as follows:
private const int WM_HOTKEY = 0x312; // Window message - hotkey
private const int WM_CREATE = 0x1; // Window message - create
private const int WM_DESTROY = 0x2; // Window message - The destruction
private const int Space = 0x3572; // hotkey ID
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
switch (m.Msg)
{
case WM_HOTKEY: // Window message - hotkey ID
switch (m.WParam.ToInt32())
{
case Space: // hotkey ID
MessageBox.Show(" I pressed the Control +Shift +Alt +S");
break;
default:
break;
}
break;
case WM_CREATE: // Window message - create
AppHotKey.RegKey(Handle, Space, AppHotKey.KeyModifiers.Ctrl | AppHotKey.KeyModifiers.Shift | AppHotKey.KeyModifiers.Alt, Keys.S);
break;
case WM_DESTROY: // Window message - The destruction
AppHotKey.UnRegKey(Handle, Space); // Destroy the hotkey
break;
default:
break;
}
}Hopefully this article has helped you with your C# programming.