[news.eclipse.platform.swt] Re: How to know if application already runni

[Benjamin Pasero <bpasero@xxxxxxxxxx>]

Daniel Spiewak wrote:

> I would run it on port 25, the smtp mail server port.  This port is
> fairly commonly allowed, but few systems actually run a mail server.
>
> As to the Display class, it is a static method which to the best of my
> knowledge, queries the system for all open Shell(s), even the native
> ones, and returns them in an array.  I use this method to show error
> dialogs when my application unexpected quits.  

I am not seeing any public static method in Display that returns an
array of Shells. Are you using an older
version of SWT, maybe from 3.0?

> But, all in all, I'd use sockets first.  More reliable, more flexible,
> less confusing, and all around a more elegant hack.

I think a Display-Method would be most elegant. The disadvantage of
Sockets is always that the user most likely
will be prompted by his firewall to allow the application to communicate
on the given port. Having port 25, most
users will rightfully ask, why the application requires the SMTP Port to
be opened.

Ben

>
> Daniel
>
> Benjamin Pasero wrote:
>
>>Doug Pearson wrote:
>>
>>  
>>
>>>I'd thought about using files, but hadn't considered a socket
>>>solution.    That sounds good and will work fine on any platform. 
>>>Thanks,
>>>    
>>>
>>Maybe if you could share your solution with Sockets here? I was thinking
>>of implementing a Socket-way
>>to get out if my application is already running. But I wonder what port
>>to chose to run the Socket through?
>>
>>Ben
>>
>>  
>>
>>>Doug
>>>
>>>Benjamin Pasero wrote:
>>>
>>>    
>>>
>>>>Daniel Spiewak wrote:
>>>>
>>>>
>>>>      
>>>>
>>>>>You have several options on this one, only one of them having to do
>>>>>with SWT itself.  The Display class has a method which returns an
>>>>>array of all the Shell(s) open on that Display.  Alternatively, you
>>>>>can use file-locking, even server sockets to implement the behavior.
>>>>>        
>>>>>
>>>>As far as I can see, a new Display class is created with each new SWT
>>>>application. So, how should one display
>>>>know of the Shells of another application? I dont think (and checked)
>>>>that its working.
>>>>
>>>>sockets seem to be the best (and most common) way to achieve this.
>>>>
>>>>Ben
>>>>
>>>>
>>>>      
>>>>
>>>>>Daniel
>>>>>
>>>>>Doug Pearson wrote:
>>>>>
>>>>>
>>>>>        
>>>>>
>>>>>>Is there any way to detect from one SWT application if another SWT
>>>>>>application is already running?
>>>>>>
>>>>>>In Windows the usual solution to this was using ::FindWindow() to
>>>>>>look for the window class (or name).
>>>>>>
>>>>>>Is there anything like that or any alternative available in SWT?
>>>>>>
>>>>>>Doug
>>>>>>
>>>>>>          
>>>>>>