dy_2000_abc(芝麻开门)

public class Form1 : System.Windows.Forms.Form,IMessageFilter

{

private System.Windows.Forms.Button button1;

static void Main()

{

Application.Run(new Form1());

}

private void Form1_Load(object sender, System.EventArgs e)

{

Application.AddMessageFilter(this);

}

public bool PreFilterMessage(ref Message msg)

{

if (msg.Msg==0x205)

{

this.button1.Visible=true;

return true;

}

else

if (msg.Msg==0x201)

{

this.button1.Visible=false;

return true;

}

else

return false;

}

}

}