WPF-禁止二次启动

App.xaml.cs

 1         protected override void OnStartup(StartupEventArgs e)
 2         {
 3             //禁止二次启动
 4             this.Startup += new StartupEventHandler(App_Startup);
 5             base.OnStartup(e);
 6         }
 7         #region 禁止二次启动
 8         // 用于激活已打开的窗体
 9         [DllImport("user32.dll")]
10         public static extern void SetForegroundWindow(IntPtr hwnd);
11         //操作当前窗体
12         //nCmdShow: 0关闭窗口/1正常大小显示窗口/2最小化窗口/3最大化窗口
13         [DllImport("user32.dll")]
14         public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);
15 
16         System.Threading.Mutex mutex;
17         void App_Startup(object sender, StartupEventArgs e)
18         {
19             bool ret;
20             mutex = new System.Threading.Mutex(true, "WpfDemo", out ret);
21             if (!ret)
22             {
23                 System.Diagnostics.Process[] proc = System.Diagnostics.Process.GetProcessesByName("WpfDemo");
24                 foreach (System.Diagnostics.Process p in proc)
25                 {
26                     SetForegroundWindow(p.MainWindowHandle);
27                     ShowWindow(p.MainWindowHandle, 1);
28                     NoSecond.SendMessage(p.MainWindowHandle);
29                 }
30                 Environment.Exit(0);
31             }
32         }
33         #endregion

NoSecond.cs

 1     /// <summary>
 2     /// 禁止程序二次启动
 3     /// </summary>
 4     public class WPFNoSecond
 5     {
 6         public const int NoSecond_DATA = 0x004A;
 7         [DllImport("User32.dll", EntryPoint = "SendMessage")]
 8         private static extern int SendMessage
 9         (
10                 IntPtr hWnd,                   //目标窗体句柄
11                 int Msg,                       //WM_COPYDATA
12                 int wParam,                                             //自定义数值
13                 ref  CopyDataStruct lParam             //结构体
14         );
15         [StructLayout(LayoutKind.Sequential)]
16         public struct CopyDataStruct
17         {
18             public IntPtr dwData;
19             public int cbData;//字符串长度
20             [MarshalAs(UnmanagedType.LPStr)]
21             public string lpData;//字符串
22         }
23 
24         public static void SendMessage(IntPtr thisIntPtr)
25         {
26             IntPtr xmlIntPt = new IntPtr(GetIntPtr());
27             if (xmlIntPt != IntPtr.Zero || thisIntPtr != IntPtr.Zero)
28             {
29                 CopyDataStruct cds;
30                 cds.dwData = IntPtr.Zero;
31                 cds.lpData = "0123";
32                 cds.cbData = 4;//注意：长度为字节数
33                 int fromWindowHandler = 0;// 消息来源窗体
34                 SendMessage(thisIntPtr.ToInt32() == 0 ? xmlIntPt : thisIntPtr, NoSecond_DATA, fromWindowHandler, ref  cds);
35             }
36         }
37 
38         #region 窗体句柄指针
39         static string _IntPtrDataDic = AppDomain.CurrentDomain.BaseDirectory + "/XML/";
40         static string _IntPtrDataName = "Data.xml";
41         static void intPtrDataExists()
42         {
43             try
44             {
45                 if (!System.IO.File.Exists(_IntPtrDataDic))
46                 {
47                     if (!Directory.Exists(_IntPtrDataDic)) { Directory.CreateDirectory(_IntPtrDataDic); }
48                     XmlDocument doc = new XmlDocument();
49                     doc.AppendChild(doc.CreateXmlDeclaration("1.0", "utf-8", ""));
50                     XmlElement root = doc.CreateElement("Root");
51                     root.InnerText = "0";
52                     doc.AppendChild(root);
53                     doc.Save(_IntPtrDataDic);
54                 }
55             }
56             catch (Exception) { }
57         }
58         static int GetIntPtr()
59         {
60             intPtrDataExists();
61             XDocument xml = XDocument.Load(_IntPtrDataDic + _IntPtrDataName);
62             XElement xmlRoot = xml.Root;
63             return Convert.ToInt32(xmlRoot.Value);
64         }
65         public static void SetIntPtr(string intPtr)
66         {
67             intPtrDataExists();
68             XDocument xml = XDocument.Load(_IntPtrDataDic + _IntPtrDataName);
69             XElement xmlRoot = xml.Root;
70             xmlRoot.Value = intPtr;
71             xml.Save(_IntPtrDataDic + _IntPtrDataName);
72         }
73         #endregion
74     }

Window.cs

 1         #region 禁止二次启动
 2         private void Window_SourceInitialized(object sender, EventArgs e)
 3         {
 4             HwndSource source = HwndSource.FromHwnd(new WindowInteropHelper(this).Handle);
 5             if (source == null) { throw new Exception("Cannot get HwndSource instance."); }
 6             source.AddHook(new HwndSourceHook(this.WndProc));
 7         }
 8         private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
 9         {
10             try
11             {
12                 switch (msg)
13                 {
14                     case WPFNoSecond.NoSecond_DATA:
15                         this.Show();
16                         break;
17                 }
18             }
19             catch (Exception) { }
20             return IntPtr.Zero;
21         }
22         #endregion
23         //最小化到托盘
24         private void Window_Min(object sender, RoutedEventArgs e)
25         {
26             //存储当前窗体句柄
27             WPFNoSecond.SetIntPtr(new WindowInteropHelper(this).Handle.ToString());
28         }

 

posted @ 2016-02-17 15:45  灰色雨逸  阅读(777)  评论(0)  编辑  收藏  举报