○前几天有网友问.NETCF中怎么实现No...... 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 { /**//// /// 智能设备托盘图标类 /// 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(); } /**//// /// 添加托盘图标 /// /// icon文件的有效句柄 public void Add(IntPtr hIcon) { NotifyMessage(messageWindow.Hwnd, NIM_ADD, (uint)uID, hIcon); } /**//// /// 添加托盘图标 /// /// 编译之后的资源文件中的icon资源名称,如“#201547” public void Add(string IconRes) { IntPtr hIcon = LoadIcon(GetModuleHandle(null), IconRes); NotifyMessage(messageWindow.Hwnd, NIM_ADD, (uint)uID, hIcon); } /**//// /// 添加托盘图标 /// /// icon文件 public void Add(System.Drawing.Icon icon) { NotifyMessage(messageWindow.Hwnd, NIM_ADD, (uint)uID, icon.Handle); } /**//// /// 添加托盘图标;icon为属性中的icon /// 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 } } |
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