C # system hotkeys

C # does not set the system hotkey. You need to call the system API.

I found a code segment on the Internet and practiced it well. I recorded it for future use.

The HotKey class code is as follows:

Using System; using System. collections. generic; using System. text; using System. collections; using System. windows. forms; using System. runtime. interopServices; public class Hotkey: IMessageFilter {public delegate void HotkeyEventHandler (int HotKeyID); public event HotkeyEventHandler OnHotkey; private Hashtable keyIDs = new Hashtable (); private IntPtr hWnd; /// <summary> /// secondary key /// </summary> public enu M KeyFlags {MOD_NULL = 0x0, MOD_ALT = 0x1, MOD_CONTROL = 0x2, MOD_SHIFT = 0x4, MOD_WIN = 0x8} // <summary> // register the hotkey API // </summary> [DllImport ("user32.dll")] public static extern UInt32 uregisterhotkey (IntPtr hWnd, UInt32 id, UInt32 fsModifiers, UInt32 vk ); /// <summary> /// cancel the hotkey API /// </summary> [DllImport ("user32.dll")] public static extern UInt32 UnregisterHotKey (IntPtr hWnd, UInt32 id );/ // <Summary> // Add an atom to the global atomic table // </summary> [DllImport ("kernel32.dll")] public static extern UInt32 GlobalAddAtom (String lpString ); /// <summary> /// delete an atom from the global atomic table /// </summary> [DllImport ("kernel32.dll")] public static extern UInt32 GlobalDeleteAtom (UInt32 nAtom ); /// <summary> /// constructor /// </summary> /// <param name = "hWnd"> current handle </param> public Hotkey (IntPtr hWnd) {this. hWnd = hWnd; Application. addMes SageFilter (this);} // <summary> // register the hotkey // </summary> public int RegisterHotkey (Keys Key, KeyFlags keyflags) {UInt32 hotkeyid = GlobalAddAtom (System. guid. newGuid (). toString (); RegisterHotKey (IntPtr) hWnd, hotkeyid, (UInt32) keyflags, (UInt32) Key); keyIDs. add (hotkeyid, hotkeyid); return (int) hotkeyid;} // <summary> // cancel all hotkeys /// </summary> public void UnregisterHotkeys () {Application. remov EMessageFilter (this); foreach (UInt32 key in keyIDs. values) {UnregisterHotKey (hWnd, key); GlobalDeleteAtom (key );}} /// <summary> /// Message filtering /// </summary> public bool PreFilterMessage (ref Message m) {if (m. msg = 0x312) {if (OnHotkey! = Null) {foreach (UInt32 key in keyIDs. values) {if (UInt32) m. WParam = key) {OnHotkey (int) m. WParam); return true ;}}} return false ;}}

Call method:

Private Hotkey hotkey; private int hotKey_Ctrl_F2; private void btnHotKey_Click (object sender, EventArgs e) {if (btnHotKey. text = "register hotkey") {Hotkey = new hotkey (this. handle); // defines the hotkey (Ctrl + F2) hotKey_Ctrl_F2 = hotkey. registerHotkey (System. windows. forms. keys. f2, Hotkey. keyFlags. MOD_CONTROL); hotkey. onHotkey + = new Hotkey. hotkeyEventHandler (OnHotkey); btnHotKey. text = "logout hotkey";} else {hotkey. unregisterHotkeys (); btnHotKey. text = "register hotkey" ;}} private void OnHotkey (int HotkeyID) {if (HotkeyID = hotKey_Ctrl_F2) {this. windowState = FormWindowState. normal; this. focus (); MessageBox. show ("Ctrl + F2 ");}}

Instance download: http://files.cnblogs.com/zjfree/HotKey.rar

Running Environment: WIN2003 + VS2005