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copied!<p>Actually after looking at the code jlvaquero posted above I found the following on the same site </p> <p><a href="http://pinvoke.net/default.aspx/user32/EnumDesktopWindows.html" rel="nofollow">EnumDesktopWindows (user32)</a></p> <p>I added the following using statements to my laucher script:</p> <ol> <li><code>using System.Text;</code></li> <li><code>using System.Runtime.InteropServices;</code></li> </ol> <p>I then added the following class to my launcher script</p> <pre><code> /// <summary> /// EnumDesktopWindows Demo - shows the caption of all desktop windows. /// Authors: Svetlin Nakov, Martin Kulov /// Bulgarian Association of Software Developers - http://www.devbg.org/en/ /// </summary> public class user32 { /// <summary> /// filter function /// </summary> /// <param name="hWnd"></param> /// <param name="lParam"></param> /// <returns></returns> public delegate bool EnumDelegate(IntPtr hWnd, int lParam); /// <summary> /// check if windows visible /// </summary> /// <param name="hWnd"></param> /// <returns></returns> [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] public static extern bool IsWindowVisible(IntPtr hWnd); /// <summary> /// return windows text /// </summary> /// <param name="hWnd"></param> /// <param name="lpWindowText"></param> /// <param name="nMaxCount"></param> /// <returns></returns> [DllImport("user32.dll", EntryPoint = "GetWindowText", ExactSpelling = false, CharSet = CharSet.Auto, SetLastError = true)] public static extern int GetWindowText(IntPtr hWnd, StringBuilder lpWindowText, int nMaxCount); /// <summary> /// enumarator on all desktop windows /// </summary> /// <param name="hDesktop"></param> /// <param name="lpEnumCallbackFunction"></param> /// <param name="lParam"></param> /// <returns></returns> [DllImport("user32.dll", EntryPoint = "EnumDesktopWindows", ExactSpelling = false, CharSet = CharSet.Auto, SetLastError = true)] public static extern bool EnumDesktopWindows(IntPtr hDesktop, EnumDelegate lpEnumCallbackFunction, IntPtr lParam); } </code></pre> <p>I then added the following function in my launch script to call the new class and do the processing to discover the active windows</p> <pre><code>/// <summary> /// Checks if application window open. /// </summary> /// <returns></returns> private static bool IfApplicationWindowOpen(string windowName) { List<string> collection = new List<string>(); user32.EnumDelegate filter = delegate(IntPtr hWnd, int lParam) { StringBuilder strbTitle = new StringBuilder(255); int nLength = user32.GetWindowText(hWnd, strbTitle, strbTitle.Capacity + 1); string strTitle = strbTitle.ToString(); if (user32.IsWindowVisible(hWnd) && string.IsNullOrEmpty(strTitle) == false) { collection.Add(strTitle); } return true; }; if (user32.EnumDesktopWindows(IntPtr.Zero, filter, IntPtr.Zero)) { foreach (string item in collection) { if (item.ToString().Equals(windowName)) { return true; break; } } } return false; } </code></pre> <p>And finally I modified my launch function to include the check for the active windows</p> <pre><code>/// <summary> /// Starts the new customer. /// </summary> /// <param name="param">The param.</param> public static void StartNewCustomer(Parameter param) { string windowName = "New Customer"; if (!IfApplicationWindowOpen(windowName)) { GlobalFactory globalfactory = param.GlobalFactory; try { Generic objNewCustomer = new Generic(); objNewCustomer.StartNewCustomerFromCustomer(param); } catch (TypeInitializationException tx) { globalfactory.ErrorHandler.Log(tx, (int)msmsError.ErrorSeverity.Major | (int)msmsError.ErrorSeverity.User); } catch (Exception ex) { globalfactory.ErrorHandler.Log(ex, (int)msmsError.ErrorSeverity.Major | (int)msmsError.ErrorSeverity.User); } } else { MessageBox.Show("The application " + windowName + " is already open", windowName + ": Launch Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } </code></pre> <p>Hope this helps anyone else with the same problem</p> <p>Regards,</p> <p>Comic Coder</p>

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