Bug 164181. Prevent multiple instances of CASAManager on windows.

CASA/CASA.changes

@@ -1,3 +1,7 @@
+--------------------------------------------------------------------
+Mon Jul 03 13:01:53 MST 2006 - jnorman@novell.com
+- Bug 164181.  Prevent multiple instances of CASAManager on windows.
+
 --------------------------------------------------------------------
 Tue Jun 27 14:22:53 MST 2006 - jnorman@novell.com
 - Added miCASARemoveKey API to dll.

CASA/gui/CASAManager.csproj

@@ -104,40 +104,40 @@
                     Project = "{E21DD887-22F4-4935-9851-409715F663B0}"
                     Package = "{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}"
                 />
-                <Reference
-                    Name = "Novell.CASA.CASAPolicy"
-                    Project = "{636A9D7E-BFB5-4EB9-96F8-51FF85A98826}"
-                    Package = "{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}"
-                />
-                <Reference
-                    Name = "glib-sharp"
-                    AssemblyName = "glib-sharp"
-                    HintPath = "..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp-2.0\glib-sharp.dll"
-                />
-                <Reference
-                    Name = "gtk-sharp"
-                    AssemblyName = "gtk-sharp"
-                    HintPath = "..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp-2.0\gtk-sharp.dll"
-                />
                 <Reference
                     Name = "pango-sharp"
                     AssemblyName = "pango-sharp"
-                    HintPath = "..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp-2.0\pango-sharp.dll"
+                    HintPath = "..\..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp\pango-sharp.dll"
                 />
                 <Reference
                     Name = "atk-sharp"
                     AssemblyName = "atk-sharp"
-                    HintPath = "..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp-2.0\atk-sharp.dll"
+                    HintPath = "..\..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp\atk-sharp.dll"
                 />
                 <Reference
                     Name = "gdk-sharp"
                     AssemblyName = "gdk-sharp"
-                    HintPath = "..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp-2.0\gdk-sharp.dll"
+                    HintPath = "..\..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp\gdk-sharp.dll"
                 />
                 <Reference
                     Name = "glade-sharp"
                     AssemblyName = "glade-sharp"
-                    HintPath = "..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp-2.0\glade-sharp.dll"
+                    HintPath = "..\..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp\glade-sharp.dll"
+                />
+                <Reference
+                    Name = "glib-sharp"
+                    AssemblyName = "glib-sharp"
+                    HintPath = "..\..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp\glib-sharp.dll"
+                />
+                <Reference
+                    Name = "gtk-sharp"
+                    AssemblyName = "gtk-sharp"
+                    HintPath = "..\..\..\..\..\..\GtkRun\2.8\lib\gtk-sharp\gtk-sharp.dll"
+                />
+                <Reference
+                    Name = "Novell.CASA.CASAPolicy"
+                    Project = "{636A9D7E-BFB5-4EB9-96F8-51FF85A98826}"
+                    Package = "{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}"
                 />
             </References>
         </Build>
@@ -198,6 +198,11 @@
                     SubType = "Code"
                     BuildAction = "Compile"
                 />
+                <File
+                    RelPath = "SingleApplication.cs"
+                    SubType = "Code"
+                    BuildAction = "Compile"
+                />
                 <File
                     RelPath = "Store.cs"
                     SubType = "Code"

CASA/gui/CASAManager.csproj.user

@@ -1,7 +1,7 @@
 <VisualStudioProject>
     <CSHARP LastOpenVersion = "7.10.3077" >
         <Build>
-            <Settings ReferencePath = "C:\GtkRun\2.8\lib\gtk-sharp-2.0\" >
+            <Settings ReferencePath = "D:\casa\extern\w32\gtk-sharp-2.0\;C:\GtkRun\2.8\lib\gtk-sharp\" >
                 <Config
                     Name = "Debug"
                     EnableASPDebugging = "false"

CASA/gui/Common.cs

@@ -281,6 +281,10 @@ public class Common
 		}
 		else if( true == IS_WINDOWS )
 		{
+#if W32
+			bRet = SingleInstance.SingleApplication.Run();
+#endif
+
 #if DOTNET2
             Process current = Process.GetCurrentProcess();
             Process[] p = System.Diagnostics.Process.GetProcessesByName("CASAManager");

CASA/gui/SingleApplication.cs

@@ -0,0 +1,137 @@
+using System;
+using System.Windows.Forms;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Diagnostics;
+using System.Threading;
+using System.Reflection;
+using System.IO;
+
+namespace SingleInstance
+{
+	/// <summary>
+	/// Summary description for SingleApp.
+	/// </summary>
+	public class SingleApplication
+	{
+		public SingleApplication()
+		{
+
+		}
+		/// <summary>
+		/// Imports 
+		/// </summary>
+	
+		[DllImport("user32.dll")]
+		private static extern int ShowWindow(IntPtr hWnd, int nCmdShow);
+
+		[DllImport("user32.dll")]
+		private static extern int SetForegroundWindow(IntPtr hWnd);
+
+		[DllImport("user32.dll")]
+		private static extern int IsIconic(IntPtr hWnd);
+
+		/// <summary>
+		/// GetCurrentInstanceWindowHandle
+		/// </summary>
+		/// <returns></returns>
+		private static IntPtr GetCurrentInstanceWindowHandle()
+		{    
+			IntPtr hWnd = IntPtr.Zero;
+			Process process = Process.GetCurrentProcess();
+			Process[] processes = Process.GetProcessesByName(process.ProcessName);
+			foreach(Process _process in processes)
+			{
+				// Get the first instance that is not this instance, has the
+				// same process name and was started from the same file name
+				// and location. Also check that the process has a valid
+				// window handle in this session to filter out other user's
+				// processes.
+				if (_process.Id != process.Id &&
+					_process.MainModule.FileName == process.MainModule.FileName &&
+					_process.MainWindowHandle != IntPtr.Zero)    
+				{
+					hWnd = _process.MainWindowHandle;
+					break;
+				}
+			}
+			Console.WriteLine("Window Handle: " + hWnd.ToString());
+			return hWnd;
+		}
+		/// <summary>
+		/// SwitchToCurrentInstance
+		/// </summary>
+		public static bool SwitchToCurrentInstance()
+		{    
+			IntPtr hWnd = GetCurrentInstanceWindowHandle();
+			if (hWnd != IntPtr.Zero)    
+			{    
+				// Restore window if minimised. Do not restore if already in
+				// normal or maximised window state, since we don't want to
+				// change the current state of the window.
+				if (IsIconic(hWnd) != 0)
+				{
+					ShowWindow(hWnd, SW_RESTORE);
+				}
+
+				// Set foreground window.
+				SetForegroundWindow(hWnd);
+				return true;
+			}
+			else 
+				return false;
+		}
+
+		/// <summary>
+		/// Execute a form base application if another instance already running on
+		/// the system activate previous one
+		/// </summary>
+		/// <param name="frmMain">main form</param>
+		/// <returns>true if no previous instance is running</returns>
+		public static bool Run(System.Windows.Forms.Form frmMain)
+		{
+			if(IsAlreadyRunning())
+			{
+				//set focus on previously running app
+				SwitchToCurrentInstance();
+				return false;
+			}
+			Application.Run(frmMain);
+			return true;
+		}
+
+		/// <summary>
+		/// for GUI
+		/// </summary>
+		/// <returns></returns>
+		public static bool Run()
+		{
+			if(IsAlreadyRunning()) 
+			{				
+				return true;
+			}
+			return false;
+		}
+
+		/// <summary>
+		/// check if given exe alread running or not
+		/// </summary>
+		/// <returns>returns true if already running</returns>
+		private static bool IsAlreadyRunning()
+		{
+			string strLoc = Assembly.GetExecutingAssembly().Location;
+			FileSystemInfo fileInfo = new FileInfo(strLoc);
+			string sExeName = fileInfo.Name;
+			bool bCreatedNew;
+
+			mutex = new Mutex(true, "Global\\"+sExeName, out bCreatedNew);
+			if (bCreatedNew)
+				mutex.ReleaseMutex();
+
+			return !bCreatedNew;
+		}
+		
+		static Mutex mutex;
+		const int SW_RESTORE = 9;
+	}
+}