Checking If My Windows Application Is Running

Check if a process is running or not on Windows?

You can not rely on lock files in Linux or Windows. I would just bite the bullet and iterate through all the running programs. I really do not believe it will be as "expensive" as you think. psutil is an excellent cross-platform python module cable of enumerating all the running programs on a system.

import psutil    
"someProgram" in (p.name() for p in psutil.process_iter())

Check if Windows Application is running (not process)

uITestControl.Exists did the trick for me.

This method will return a boolean value corresponding to the existence of the application window being open. This allows an if statement to be created that can open the application if not already open, or do nothing if its already open.

Checking if my Windows application is running

public partial class App : System.Windows.Application
{
    public bool IsProcessOpen(string name)
    {
        foreach (Process clsProcess in Process.GetProcesses()) 
        {
            if (clsProcess.ProcessName.Contains(name))
            {
                return true;
            }
        }

        return false;
    }

    protected override void OnStartup(StartupEventArgs e)
    {
        // Get Reference to the current Process
        Process thisProc = Process.GetCurrentProcess();

        if (IsProcessOpen("name of application.exe") == false)
        {
            //System.Windows.MessageBox.Show("Application not open!");
            //System.Windows.Application.Current.Shutdown();
        }
        else
        {
            // Check how many total processes have the same name as the current one
            if (Process.GetProcessesByName(thisProc.ProcessName).Length > 1)
            {
                // If ther is more than one, than it is already running.
                System.Windows.MessageBox.Show("Application is already running.");
                System.Windows.Application.Current.Shutdown();
                return;
            }

            base.OnStartup(e);
        }
    }

how to check if any program is running in windows using python

I needed to pass it like this;

def IsRunning(WindowName):
    try:
        if win32ui.FindWindow(None, WindowName):
            print("its running")
            return True
    except win32ui.error:
        print("its not running!")
        return False

You need to put the window title exactly for it to pass the test and return True...

The next thing I want to write is a similar function that uses regular expressions to find any part of a title name...

Brilliant!!! Happy now :)

The only thing with this, is that if the Applications creator decides to change the title of the main window of the program you are trying to test for, it will no longer work... I was hoping for a much more robust way of doing it... i.e. through some kind of unique process code!

in any case this will do for the time being, but if anyone has a more definitive answer please let me know...

How to check if a process is running on Windows?

There is no direct way to query general processes as each OS handles them differently.

You kinda stuck with using proxies such as direct OS commands...

You can however, find a specific process using tasklist.exe with /fi parameter.

e.g: tasklist.exe /nh /fi "Imagename eq chrome.exe"
Note the mandatory double quotes.

Syntax & usage are available on MS Technet site.

Same example, filtering for "chrome.exe" in Java:

String findProcess = "chrome.exe";
String filenameFilter = "/nh /fi \"Imagename eq "+findProcess+"\"";
String tasksCmd = System.getenv("windir") +"/system32/tasklist.exe "+filenameFilter;

Process p = Runtime.getRuntime().exec(tasksCmd);
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));

ArrayList<String> procs = new ArrayList<String>();
String line = null;
while ((line = input.readLine()) != null) 
    procs.add(line);

input.close();

Boolean processFound = procs.stream().filter(row -> row.indexOf(findProcess) > -1).count() > 0;
// Head-up! If no processes were found - we still get: 
// "INFO: No tasks are running which match the specified criteria."

How can I check if my program is already running?

Have a look at using a mutex.

static class Program {
    static Mutex mutex = new Mutex(true, "{8F6F0AC4-B9A1-45fd-A8CF-72F04E6BDE8F}");
    [STAThread]
    static void Main() {
        if(mutex.WaitOne(TimeSpan.Zero, true)) {
            try
            {
             Application.EnableVisualStyles();
             Application.SetCompatibleTextRenderingDefault(false);
             Application.Run(new Form1());
            }
            finally
            {
             mutex.ReleaseMutex();
            }
        } else {
            MessageBox.Show("only one instance at a time");
        }
    }
}

If our app is running, WaitOne will return false, and you'll get a message box.

As @Damien_The_Unbeliever pointed out correctly, you should change the Guid of the mutex for each application you write!

Source: http://sanity-free.org/143/csharp_dotnet_single_instance_application.html

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