Installing a Message Filter : Message « Windows « C# / C Sharp

1. C# / C Sharp
2. Windows
3. Message

Installing a Message Filter

using System;
using System.Windows.Forms;
   
public class BlockLeftMouseButtonMessageFilter : IMessageFilter
{
    const int WM_LBUTTONDOWN = 0x201;
    const int WM_LBUTTONUP = 0x202;
    
    public bool PreFilterMessage(ref Message m)
    {
        if(m.Msg == WM_LBUTTONDOWN)
        {
            Console.WriteLine("The left mouse button is down.");
            return true;
        }
        if(m.Msg == WM_LBUTTONUP)
        {
            Console.WriteLine("The left mouse button is up.");
            return true;
        }
        return false;
    }
}
   
public class MainForm : Form
{
    public static void Main()
    {
        MainForm MyForm = new MainForm();
        BlockLeftMouseButtonMessageFilter MsgFilter = new BlockLeftMouseButtonMessageFilter();
   
        Application.AddMessageFilter(MsgFilter);
        Application.Run(MyForm);
    }
   
    public MainForm()
    {
        Text = "Message Filter Test";
    }
}

           
       

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1.

Removing an Installed Message Filter