Returning Focus of a "lost" window

Returning Focus of a "lost" window

• tt2lhp

  Hello,

  Have you tried this way: http://msdn2.microsoft.com/en-us/library/ms996475.aspx to force only one instance of the application

  Hope it helps. Thank you

  
  
  

• Andy Jarvis

  using System;
  using System.Runtime.InteropServices;
  using System.Windows.Forms;
  using System.Diagnostics;
  using System.Reflection;
  
  public class OneInstnace
  {
  [STAThread]
  public static void Main()
  {
  //Get the running instance.
  Process instance = RunningInstance();
  if (instance == null)
  {
  //There isn't another instance, show our form.
  Application.Run (new Form());
  }
  else
  {
  //There is another instance of this process.
  HandleRunningInstance(instance);
  }
  }
  public static Process RunningInstance()
  {
  Process current = Process.GetCurrentProcess();
  Process[] processes = Process.GetProcessesByName (current.ProcessName);
  
  //Loop through the running processes in with the same name
  foreach (Process process in processes)
  {
  //Ignore the current process
  if (process.Id != current.Id)
  {
  //Make sure that the process is running from the exe file.
  if (Assembly.GetExecutingAssembly().Location.Replace( "/", "\\") ==
  current.MainModule.FileName)
  {
  //Return the other process instance.
  return process;
  }
  }
  }
  
  //No other instance was found, return null.
  return null;
  }
  
  
  public static void HandleRunningInstance(Process instance)
  {
  //Make sure the window is not minimized or maximized
  ShowWindowAsync (instance.MainWindowHandle , WS_SHOWNORMAL);
  
  //Set the real intance to foreground window
  SetForegroundWindow (instance.MainWindowHandle);
  }
  
  [DllImport("User32.dll")]
  
  private static extern bool ShowWindowAsync(
  IntPtr hWnd, int cmdShow);
  [DllImport("User32.dll")] private static extern bool
  SetForegroundWindow(IntPtr hWnd);
  private const int WS_SHOWNORMAL = 1;
  }
  
  
  
• Returning Focus of a "lost" window