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 1     public static class WindowsMessageHelper
 2     {
 3 
 4         public const int WM_COPYDATA = 0x004A;
 5 
 6         [DllImport("User32.dll", EntryPoint = "SendMessage")]
 7         private static extern int SendMessage
 8         (
 9         IntPtr hWnd,//目标窗体句柄
10         int Msg,//WM_COPYDATA
11         int wParam,//自定义数值
12         ref COPYDATASTRUCT lParam//结构体
13         );
14 
15         [DllImport("User32.dll", EntryPoint = "FindWindow")]
16         public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
17 
18 
19         [DllImport("user32.dll", EntryPoint = "SendMessage")]
20         private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
21 
22 
23         [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
24         public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);
25 
26 
27         [DllImport("user32.dll ")]
28         private extern static int SetActiveWindow(IntPtr hwnd);
29 
30         /// <summary>
31         /// 根据句柄查找进程ID
32         /// </summary>
33         /// <param name="hwnd"></param>
34         /// <param name="ID"></param>
35         /// <returns></returns>
36         [System.Runtime.InteropServices.DllImport("User32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto)]
37         public static extern int GetWindowThreadProcessId(IntPtr hwnd, out int ID);
38 
39 
40         #region 打开该程序主窗口
41         /// <summary>
42         /// 打开该程序主窗口
43         /// </summary>
44         public static void RaiseOtherProcess(Process otherProc, string windowTitle = "你打开的窗口标题")
45         {
46             var proc = Process.GetCurrentProcess();
47             {
48                 if (proc.Id != otherProc.Id)
49                 {
50                     var hWnd = otherProc.MainWindowHandle;
51                     if (hWnd.ToInt32() == 0)
52                     {
53                         hWnd = FindWindow(null, windowTitle);
54                         int id = -1;
55                         GetWindowThreadProcessId(hWnd, out id);
56                     }
57                     ShowWindow(hWnd, 0);
58                     ShowWindow(hWnd, 1);
59                     SetActiveWindow(hWnd);
60                     InteropMethods.SetForegroundWindow(hWnd);
61                     //此处获取的hWnd即为之前运行程序的主窗口句柄，再使用其他函数打开窗体
62                 }
63             }
64         }
65         #endregion
66 
67         [StructLayout(LayoutKind.Sequential)]
68         public struct COPYDATASTRUCT
69         {
70 
71             public IntPtr dwData;
72             public int cbData;//字符串长度
73             [MarshalAs(UnmanagedType.LPStr)]
74             public string lpData;//字符串
75         }
76 
77 
78     }
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