Talk:Allow only one installer instance

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User:Saivert You can also put the value of $HWNDPARENT variable in a registry key and then use this in a second invocation of the installer to bring the original installer window to front. Like in this example: 

System::Call 'kernel32::CreateMutexA(i 0, i 0, t "myMutex") i .r1 ?e'
Pop $R0 
 
StrCmp $R0 0 goahead
  MessageBox MB_OK "The installer is already running." 
  ReadRegStr $R0 HKLM "Software\MyApp" "installerhwnd"
  System::Call 'user32::SetForegroundWindow(i R0) i ..'
  Abort
goahead:
WriteRegStr HKLM "Software\MyApp" "installerhwnd" $HWNDPARENT

Hope this helps further....

Forum thread for this article

http://forums.winamp.com/showthread.php?t=362157

Slappy 04:40, 27 May 2013 (UTC)

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