.NET (Core and Framework)

<br />
static void Main() <br />
{<br />
    Application.AddMessageFilter(new TestMessageFilter());<br />
    Application.Run(new Form1());<br />
}<br />
<br />
public class TestMessageFilter : IMessageFilter <br />
{<br />
    public bool PreFilterMessage(ref Message m) <br />
    {<br />
        const int WM_KEYDOWN= 0x0100;<br />
        // Blocks all the messages relating to the left mouse button.<br />
        if (m.Msg==WM_KEYDOWN) <br />
        {<br />
            MessageBox.Show("KeyDown hitted"); <br />
        }<br />
<br />
        return false;<br />
    }<br />
}<br />
<br />

public Form1()<br />
        {<br />
            // Alt = 1, Ctrl = 2, Shift = 4, Win = 8<br />
            Form1.RegisterHotKey(this.Handle,this.GetType().GetHashCode(), 8, (int)'P');<br />
            InitializeComponent();<br />
            keyboardHook = new Kennedy.ManagedHooks.KeyboardTracking();<br />
            keyboardHook.KeyboardEvent += new Kennedy.ManagedHooks.KeyboardTracking.KeyboardEventHandler(keyboardHook_KeyboardEventExt);<br />
            <br />
        }<br />
protected override void WndProc(ref Message m)<br />
        {<br />
            if (m.Msg == 0x0312)<br />
                if (keyboardHook.IsHooked)<br />
                {<br />
                    keyboardHook.UninstallHook();<br />
                    input = false;<br />
                    textBox4.Text = "";<br />
                }<br />
                else<br />
                {<br />
                    textBox4.Text = "";<br />
                    keyboardHook.InstallHook();<br />
                    input = true;<br />
                }<br />
             base.WndProc(ref m);<br />
        }<br />
 private void keyboardHook_KeyboardEventExt(Kennedy.ManagedHooks.KeyboardEvents kEvent, Keys key)<br />
        {<br />
            bool shi;<br />
            if(keyboardHook.ShiftPressed == true)<br />
                shi = true;<br />
            else<br />
                shi = false;<br />
            if(kEvent == KeyboardEvents.KeyDown){<br />
                string msg;<br />
                //snipped out some key parsing junk.<br />
                if(shi == true)<br />
                    msg = key.ToString();<br />
                else<br />
                    msg = key.ToString().ToLower();<br />
                textBox4.Text += msg;<br />
            }<br />
}<br />

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