前几天有网友问.NET CF中怎么实现NotifyIcon，我这才知道原来.NET CF并没有提供NotifyIcon控件。
于是偶想PC上可以用Shell_NotifyIcon和MessageWindow来实现托盘图标，只是不知道.NET CF支持不支持这两个东东了。仔细看了一下.NET CF中可疑的命名空间，没想到在Microsoft.WindowsCE.Forms命名空间里面竟然有一个MessageWindow 类，太好了，只剩下一个Shell_NotifyIcon 函数了。接着 在Window CE的SDK的帮助文件里，又发现Window CE Platform API已经包含了Shell_NotifyIcon函数。两大“主料”都齐了，只剩下锅了。
先看一下MessageWindow类，这个类提供了 WndProc 方法，用于处理窗口消息，并公开了可能传递给本机窗口函数的有效窗口句柄。要使用它，派生一个新类，并重写的 WndProc 方法，这样才能截获特定的窗口消息。这里主要用来处理click事件。
Shell_NotifyIcon的用法如下：
[DllImport("coredll.dll")]
internal static extern int Shell_NotifyIcon(int dwMessage, ref NOTIFYICONDATA pnid);
其中，NOTIFYICONDATA结构如下：
struct NOTIFYICONDATA
{
int cbSize;
IntPtr hWnd;
uint uID;
uint uFlags;
uint uCallbackMessage;
IntPtr hIcon;
}
Pnid参数的生命需要注意，是按引用传递的，因为Shell_NotifyIcon 需要一个指向 NOTIFYICONDATA 结构的指针。
hWnd是用来接收任务栏中图标单击消息的窗口的句柄。
运行示例的时候由于窗体最大化，挡住了任务栏，把窗体最小化之后就能看到托盘图标了。（效果图片竟然贴不上来，改天再贴吧）
该类和示例的下载地址：http://www.cnblogs.com/Files/ttinfo/NotifyIconCf.rar
下面是NotifyIcon类的实现，别忘了引用Microsoft.WindowsCE.Forms。注意Add方法提供了不同的重载形式，具体请参看注释：
using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace NotifyClient
{
/**//// <summary>
/// 智能设备托盘图标类
/// </summary>
public class NotifyIcon
{
//单击事件
public event System.EventHandler Click;
private MyMessageWindow messageWindow;
private int uID = 5000;
private System.Drawing.Icon _Icon;
public NotifyIcon()
{
messageWindow = new MyMessageWindow(this);
messageWindow.uID = uID;
}
public System.Drawing.Icon Icon
{
set
{
_Icon = value;
}
}
~NotifyIcon()
{
Remove();
}
/**//// <summary>
/// 添加托盘图标
/// </summary>
/// <param name="hIcon">icon文件的有效句柄</param>
public void Add(IntPtr hIcon)
{
NotifyMessage(messageWindow.Hwnd, NIM_ADD, (uint)uID, hIcon);
}
/**//// <summary>
/// 添加托盘图标
/// </summary>
/// <param name="IconRes">编译之后的资源文件中的icon资源名称，如“#201547”</param>
public void Add(string IconRes)
{
IntPtr hIcon = LoadIcon(GetModuleHandle(null), IconRes);
NotifyMessage(messageWindow.Hwnd, NIM_ADD, (uint)uID, hIcon);
}
/**//// <summary>
/// 添加托盘图标
/// </summary>
/// <param name="icon">icon文件</param>
public void Add(System.Drawing.Icon icon)
{
NotifyMessage(messageWindow.Hwnd, NIM_ADD, (uint)uID, icon.Handle);
}
/**//// <summary>
/// 添加托盘图标；icon为属性中的icon
/// </summary>
public void Add()
{
if (_Icon != null)
{
NotifyMessage(messageWindow.Hwnd, NIM_ADD, (uint)uID, _Icon.Handle);
}
}
public void Remove()
{
NotifyMessage(messageWindow.Hwnd, NIM_DELETE, (uint)uID, IntPtr.Zero);
}
public void Modify(IntPtr hIcon)
{
NotifyMessage(messageWindow.Hwnd, NIM_MODIFY, (uint)uID, hIcon);
}
private void NotifyMessage(IntPtr hwnd, int dwMessage, uint uID, IntPtr hIcon)
{
NOTIFYICONDATA notdata = new NOTIFYICONDATA();
notdata.cbSize = 152;
notdata.hIcon = hIcon;
notdata.hWnd = hwnd;
notdata.uCallbackMessage = WM_NOTIFY_TRAY;
notdata.uFlags = NIF_MESSAGE | NIF_ICON;
notdata.uID = uID;
int ret = Shell_NotifyIcon(dwMessage, ref notdata);
}
API#region API
//定义消息常量
const int NIF_MESSAGE = 0x00000001;
const int NIF_ICON = 0x00000002;
internal const int WM_LBUTTONDOWN = 0x0201;
internal const int NIM_ADD = 0x00000000;
internal const int NIM_MODIFY = 0x00000001;
internal const int NIM_DELETE = 0x00000002;
//自定义消息
internal const int WM_NOTIFY_TRAY = 0x0400 + 2001;
internal struct NOTIFYICONDATA
{
internal int cbSize;
internal IntPtr hWnd;
internal uint uID;
internal uint uFlags;
internal uint uCallbackMessage;
internal IntPtr hIcon;
}
[DllImport("coredll.dll")]
internal static extern int Shell_NotifyIcon(
int dwMessage, ref NOTIFYICONDATA pnid);
[DllImport("coredll.dll")]
internal static extern int SetForegroundWindow(IntPtr hWnd);
[DllImport("coredll.dll")]
internal static extern int ShowWindow(
IntPtr hWnd,
int nCmdShow);
[DllImport("coredll.dll")]
internal static extern IntPtr GetFocus();
[DllImport("coredll.dll")]
internal static extern IntPtr LoadIcon(IntPtr hInst, string IconName);
[DllImport("coredll.dll")]
internal static extern IntPtr GetModuleHandle(String lpModuleName);
#endregion
MessageWindow#region MessageWindow
internal class MyMessageWindow : Microsoft.WindowsCE.Forms.MessageWindow
{
private int _uID = 0;
private NotifyIcon notifyIcon;
public MyMessageWindow(NotifyIcon notIcon)
{
notifyIcon = notIcon;
}
public int uID
{
set
{
_uID = value;
}
}
protected override void WndProc(ref Microsoft.WindowsCE.Forms.Message msg)
{
if (msg.Msg == WM_NOTIFY_TRAY)
{
if ((int)msg.LParam == WM_LBUTTONDOWN)
{
if ((int)msg.WParam == _uID)
{
if (notifyIcon.Click != null)
notifyIcon.Click(notifyIcon, null);
}
}
}
}
}
#endregion
}
}