Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.basic.visual.misc > #1608

Re: Handling second instance works in IDE but not when compiled

Cross-posted to 2 groups.

Show all headers | View raw

On 14/10/2012 02:30, -mhd wrote:
> Normally when I detect a running instance of my prog by using a mutex value, I
> just kill the second instance but now I also want to bring the first instance up
> to normal state if its minimized.
>
>
>     MutexValue = CreateMutex(ByVal 0&, 1, "MyProgMutex")
>     If (Err.LastDllError = ERROR_ALREADY_EXISTS) Then
>        CloseHandle MutexValue
>        'Search for Window / Get its Handle
>        lhwnd = FindWindow(vbNullString, "My Prog Caption")
>        'If Another Window Found
>        If lhwnd <> 0 Then
>           'Activate and Show Window
>           lRtrn = ShowWindow(lhwnd, SW_SHOWRESTORE)
>        End If
>        'this instance exits sub main and dies
>        Exit Sub
>     End If
>
> Works just great in the IDE as the first instance pops up from minimized state
> and the second one dies.
>
> When compiled the second one dies immediately upon launching as intended but the
> first one doesn't pop up.

Have you checked whether you actually get a valid window handle?
The code above doesn't and exists only on the mutex check, regardless of 
whether it found a window or not.

-- 
Deanna Earley (dee.earley@icode.co.uk)
i-Catcher Development Team
http://www.icode.co.uk/icatcher/

iCode Systems

(Replies direct to my email address will be ignored. Please reply to the 
group.)

Back to comp.lang.basic.visual.misc | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Handling second instance works in IDE but not when compiled -mhd <not_real@invalid.com> - 2012-10-13 21:30 -0400
  Re: Handling second instance works in IDE but not when compiled Deanna Earley <dee.earley@icode.co.uk> - 2012-10-15 10:09 +0100
  Re: Handling second instance works in IDE but not when compiled BeeJ <nospam@spamnot.com> - 2012-10-17 12:24 -0700

csiph-web