App 2, 发送消息
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
public bool PreFilterMessage(ref Message m)
{
// TODO: 添加 Form1.PreFilterMessage 实现
if(m.Msg==WM_KKK)
{
MessageBox.Show("I received a messag from other app" );