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2013-09-09T14:50:11.080
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2013-09-09T14:50:11.080
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<p>I have always got a good performance by using <code>RegisterHotKey</code>/<code>UnregisterHotKey</code> functions. Sample code:</p> <pre><code>[DllImport("User32")] public static extern bool RegisterHotKey( IntPtr hWnd, int id, int fsModifiers, int vk ); [DllImport("User32")] public static extern bool UnregisterHotKey( IntPtr hWnd, int id ); public const int MOD_SHIFT = 0x4; public const int MOD_CONTROL = 0x2; public const int MOD_ALT = 0x1; public const int WM_HOTKEY = 0x312; protected override void WndProc(ref Message m) { if (m.Msg == WM_HOTKEY && m.WParam == (IntPtr)0) { IntPtr lParamCTRLA = (IntPtr)4259842; IntPtr lParamB = (IntPtr)4325376; if (m.LParam == lParamCTRLA) { MessageBox.Show("CTRL+A was pressed"); } else if (m.LParam == lParamB) { MessageBox.Show("B was pressed"); } } base.WndProc(ref m); } private void Form1_Load(object sender, EventArgs e) { this.FormClosing += new FormClosingEventHandler(Form1_FormClosing); RegisterHotKey(this.Handle, 0, MOD_CONTROL, (int)Keys.A); RegisterHotKey(this.Handle, 0, 0, (int)Keys.B); } private void Form1_FormClosing(Object sender, FormClosingEventArgs e) { UnregisterHotKey(this.Handle, 0); } </code></pre> <p>You can "register" as many keys (or combination of keys) as you want by emulating the shown structure. All the registered keys will get inside the condition <code>if (m.Msg == WM_HOTKEY && m.WParam == (IntPtr)0)</code>; if they are pressed at all (independently upon the program currently being selected). The easiest way to know the specific key/combination being pressed is relying on <code>m.LParam</code> (I got the two values I am including after a quick test with the given keys). You can do a quick research to find out a list of <code>LParam</code> or further <code>constant</code> modifiers (wheel of the mouse, for example).</p>
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1. POHow to detect a keybd_event without focus
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1. USvarocarbas
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