Program.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.IO;

namespace SeciUserInterface
{
    class Program
    {
        [STAThread]
        static void Main()
        {
            //See if Seci is already running, if so ignore this request
            if (SeciRunning())
            {
                return;
            }
            Seci.Remoting.ComInterface comObj = new Seci.Remoting.ComInterface();
            comObj.InitialiseCom();

            App app = new App();
            app.MainWindow = new UserInterface();
            app.MainWindow.Show();
            app.DispatcherUnhandledException += new System.Windows.Threading.DispatcherUnhandledExceptionEventHandler(app_DispatcherUnhandledException);

            try
            {
                app.Run();
            }
            catch (Exception err)
            {
                //Dump the error message to file
                DumpErrorToFile(err);
            }

            comObj.DisposeCom();
        }

        static void app_DispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
        {
            //Dump the error message to file
            DumpErrorToFile(e.Exception);

            e.Handled = true;
        }

        private static void DumpErrorToFile(Exception err)
        {
            String loc = System.Reflection.Assembly.GetExecutingAssembly().Location;
            String file = loc.Substring(0, loc.LastIndexOf('\\')) + "\\Seci_crash.log";
            using (StreamWriter sw = new StreamWriter(file, true))
            {
                String date = DateTime.Now.ToShortDateString() + " " + DateTime.Now.ToShortTimeString();
                sw.WriteLine(date + " " + err.Message + " " + err.Source);
                sw.WriteLine(err.StackTrace);
            }
        }

        private static Boolean SeciRunning()
        {
            System.Diagnostics.Process[] procList;
            procList = System.Diagnostics.Process.GetProcessesByName("SeciUserInterface");

            if (procList.GetLength(0) > 1)
            {
                return true;
            }

            return false;
        }
    }
}