Preventing multiple instances of a Windows app - still a problem

Phil Davis revdev at pdslabs.net
Sun Dec 4 20:59:09 EST 2011


Graham,

On XP try the 'qprocess' command. It should be available and provides similar info.

put shell("qprocess")

Best -
Phil Davis


On 12/4/11 3:24 PM, Graham Samuel wrote:
> Thanks to all those who replied to my query - I appreciate both the speed and the enthusiasm of the replies! So far I have not succeeded, but I am more than ready to believe that it's finger-trouble on my part.
>
> To take Mark Schonewille's suggestions first:
>
> 1. As I stated in my original post, I am trying to prevent multiple instances of a non-LC application, so thanks but sadly 'relaunch' won't touch the problem as far as I can see - I think 'relaunch' is actually implemented as a LC engine (or inter-engine) activity.
>
> 2. Also sadly you are right and 'tasklist' is not available in Windows XP Home, which I am using and which I'm certain a good many of my users will be using too. When I do
>
>    put shell("tasklist")
>
> I get
>
>    'tasklist' is not recognized as an internal or external command, operable program or batch file.
>
> Next, Thierry Douez:
>
>> Did you tried this way:
>>
>> 1)
>>    get "tasklist /NH /FI  "&  quote&  "IMAGENAME eq firefox.exe"&  quote
>>    put shell( IT )
>>    -- or process the shell() output
>>
>> 2)
>>    get "tasklist /NH /FI  "&  quote&  "IMAGENAME eq Troubling\ App.exe"&
>> quote
>>    put shell( IT )
>>
>>
>> Solution 1, I'm sure it works
>> Solution 2, didn't test it.
> Same problem - can't access 'tasklist'. And actually I don't understand what this script does. Presumably the parameters NH and FI do the killing?
>
> Next, Mike Bonner - again can't use tasklist, but there is a glimmer of hope in your remark
>
>> Since you just want to kill the process, and not necessarily bring it to
>> the front or anything like that, I think this is great advice. Just kill it
>> through shell, shouldn't matter if its actually running or not.
> Can I kill the process without using 'tasklist'? Since I apparently don't need to know if the process is in the list or not, could I go direct to 'kill' or whatever it's called in Windows? I tried
>
> put shell("kill FireFox.exe") but it seems 'kill' wasn't recognised, nor was 'pskill' - I have a list of Windows Command-line commands via Google in which these are included but it seems that my 'shell' doesn't invoke them.
>
> Finally, Mike gave me this little script in May - I tried to put it in a field and 'do' it as vbscript. Didn't works so then I put it in a text file, read it and tried do as vbscript again. Both times I got an execution error. Maybe it's just too late at night…
>
>   'sets the environment
> Set WshShell = WScript.CreateObject ("WScript.Shell")
>
> 'grabs the full processlist and puts it in a var
> Set colProcessList = GetObject("Winmgmts:").ExecQuery ("Select * from
> Win32_Process")
>
>
> 'loops through each looking for a match
> For Each objProcess in colProcessList
> If objProcess.name = "firefox.exe" then
>
> 'sets a flag if a match is found
> vFound = True
> End if
>
> 'next loop of course
> Next
>
> 'if a match was found, activate the app
> If vFound = True then
> WshShell.AppActivate "firefox"
> Else
>
> ' otherwise, run the app
> WshShell.Run "firefox.exe"
> End If
>
>
>
>
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-- 
Phil Davis

PDS Labs
Professional Software Development
http://pdslabs.net





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