WinCE中使用C#时使用WndProc方法的处理
时间:2011-02-16 来源:qingshuijusi
using System.Windows.Forms;
using Microsoft.WindowsCE.Forms;
换言之,System.Windows.Forms里不提供消息处理类。查阅MSDN上的示例文章(http://msdn.microsoft.com/zh-cn/library/5143xwd8%28v=VS.80%29.aspx),
微软的实现方法是:自定义消息处理类,并继承Microsoft.WindowsCE.Forms.MessageWindow类, 再在类中override WndProc方法。同时把目标Form作为自定义类的构
造函数参数传入,具体代码如下:
1. CustomMessageWindow.cs类
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.IO;
using System.Runtime.InteropServices;
namespace UDiskDemo
{
class CustomMessageWindow : Microsoft.WindowsCE.Forms.MessageWindow
{
//定义目标窗体实例
private MessageFrom msgForm;
/// <summary>
/// Constructor(传入目标窗体对象)
/// </summary>
/// <param name="frmForm">Start Form</param>
public CustomMessageWindow(MessageFrom frmForm)
{
this.msgForm = frmForm;
}
/// <summary>
///
/// </summary>
/// <param name="m"></param>
protected override void WndProc(ref Microsoft.WindowsCE.Forms.Message m)
{
try
{
switch (m.Msg)
{
case (int)CMD_DBT.WM_DEVICECHANGE: //设备改变
switch (m.WParam.ToInt32())
{
case (int)CMD_DBT.WM_DEVICECHANGE://
break;
case (int)CMD_DBT.DBT_DEVICEARRIVAL://U盘插入
{
//这里可以插入应用代码
}
break;
case (int)CMD_DBT.DBT_CONFIGCHANGECANCELED:
break;
case (int)CMD_DBT.DBT_CONFIGCHANGED:
break;
case (int)CMD_DBT.DBT_CUSTOMEVENT:
break;
case (int)CMD_DBT.DBT_DEVICEQUERYREMOVE:
break;
case (int)CMD_DBT.DBT_DEVICEQUERYREMOVEFAILED:
break;
case (int)CMD_DBT.DBT_DEVICEREMOVECOMPLETE: //U盘卸载
{
//这里可以插入应用代码
}
break;
case (int)CMD_DBT.DBT_DEVICEREMOVEPENDING:
break;
case (int)CMD_DBT.DBT_DEVICETYPESPECIFIC:
break;
case (int)CMD_DBT.DBT_DEVNODES_CHANGED://可用,设备变化时
break;
case (int)CMD_DBT.DBT_QUERYCHANGECONFIG:
break;
case (int)CMD_DBT.DBT_USERDEFINED:
break;
default:
break;
}
break;
}
}
catch
{
}
base.WndProc(ref m);
}
}
}
2. MessageForm.cs
using System;
using System.ComponentModel;
using System.Data;
using System.Text;
using System.Windows.Forms;
using Microsoft.WindowsCE.Forms;
namespace UDiskDemo
{
public partial class MessageForm: Form
{
private CustomMessageWindow customMessageWindow; //监视U盘插入/移除类
public MessageForm()
{
InitializeComponent();
customMessageWindow = new CustomMessageWindow(this);
}
}
}
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