Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Test if application is already running

Posted on 2009-07-03
3
Medium Priority
?
221 Views
Last Modified: 2013-12-27
I would like to check if there is already running an instance of program on windows mobile device, so I could prevent multiple lunches of the program.
0
Comment
Question by:uveper
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 24

Expert Comment

by:alexey_gusev
ID: 24770573
with cf.net it is done automatically by framework.

in general, there may be different techniques, such as creating a mutex (some vb example here, but works for wince as well - http://www.mrexcel.com/forum/showthread.php?t=19425), registering your unique window class and then calling FindWindow() to check if there is such one already etc.
0
 

Author Comment

by:uveper
ID: 24770632
what do you mean "with cf.net it is done automatically by framework" ?

I tried to convert vb example to c# but I failed, because I do not fully understand the syntax.
0
 

Accepted Solution

by:
uveper earned 0 total points
ID: 24770808
I found a solution!
using System.Runtime.InteropServices;
 
const string AppNamedEvent = "APP_NAMED__EVENT";
 
        [DllImport("coredll")]
        private extern static void SetWindowText(IntPtr hwnd, string text);
 
        [DllImport("coredll")]
        private static extern IntPtr FindWindow(string className, string wndName);
 
        [DllImport("coredll.dll")]
        private static extern bool SetForegroundWindow(IntPtr hWnd);
 
        [DllImport("coredll.dll", EntryPoint = "CreateEvent", SetLastError = true)]
        private static extern IntPtr CreateEvent(IntPtr lpEventAttributes, bool bManualReset, bool bInitialState, string lpName);
 
        [DllImport("coredll.dll", EntryPoint = "CloseHandle", SetLastError = true)]
        private static extern IntPtr CloseHandle(IntPtr handle);
 
//Before you do the app.run use the following code
                // makes sure that we have only one run instance
                IntPtr evnt = CreateEvent(IntPtr.Zero, false, false, AppNamedEvent);
                if (Marshal.GetLastWin32Error() != 0)
                {
                    // one instance of application is run, activate it
                    IntPtr hwnd = FindWindow(null, "StartForm");
                    if (hwnd != IntPtr.Zero)
                    {
                       SetForegroundWindow(hwnd);
                    }
                    return;
                }

Open in new window

0

Featured Post

How to Use the Help Bell

Need to boost the visibility of your question for solutions? Use the Experts Exchange Help Bell to confirm priority levels and contact subject-matter experts for question attention.  Check out this how-to article for more information.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Progress means simplifying, not complicating. Bruno Munari Preface How to detect the name of the internal storage or an SD-card on Windows Mobile device from the desktop application? I got this question, when I was working on a PC applicati…
Preface: This article is part of a series focused on cross platform mobile app development (specifically Android and iOS) using the Alloy framework and Titanium Studio made by Appcelerator (https://www.appcelerator.com/). This article presumes a wor…
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses

664 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question