Talk:CreateMutex plug-in: Difference between revisions

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Function .onInit
Function .onInit
   System::Call 'kernel32::CreateMutexA(i 0, i 0, t "NxSBalloonTipPluginSetup") i .r1 ?e'
  ; Call the Win32 API to create the mutex. Pass a unique string (ie. product name)
   Pop $R0
   System::Call 'kernel32::CreateMutexA(i 0, i 0, t "AnyUniqueText") i .r1 ?e'
   Pop $R0 ; Get the mutex handle


  ; If the create mutex call returns a NULL handle then we can proceed
  ; otherwise we must bring the already running instance to foreground.
   StrCmp $R0 0 noprevinst
   StrCmp $R0 0 noprevinst
    ; Get the window handle from registry
     ReadRegStr $R0 HKCU "${PLUGIN_INSTREGKEY}" "WindowHandle"
     ReadRegStr $R0 HKCU "${PLUGIN_INSTREGKEY}" "WindowHandle"
     System::Call 'user32::SetForegroundWindow(i $R0) i ?e'
     System::Call 'user32::SetForegroundWindow(i $R0) i ?e'
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FunctionEnd
FunctionEnd


Function .onMyGUIInit
Function .onGUIInit
  ; Once the installer GUI is up, store the window handle for use later
   WriteRegStr HKCU "${PLUGIN_INSTREGKEY}" "WindowHandle" "$HWNDPARENT"
   WriteRegStr HKCU "${PLUGIN_INSTREGKEY}" "WindowHandle" "$HWNDPARENT"
FunctionEnd
FunctionEnd


Function .onGUIEnd
Function .onGUIEnd
  ; Remove the registry value once installer quits
   DeleteRegValue HKCU "${PLUGIN_INSTREGKEY}" "WindowHandle"
   DeleteRegValue HKCU "${PLUGIN_INSTREGKEY}" "WindowHandle"
  DeleteRegKey /ifempty HKCU "${PLUGIN_INSTREGKEY}"
FunctionEnd
FunctionEnd


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This code also brings the running instance of the installer to the foreground if starting another instance.
This code also brings the running instance of the installer to the foreground if starting another instance.
:Partly applied as a link to [[Allow_only_one_installer_instance]] page, except the extra code about bringing window to foreground - which is not related to mutexes. -- [[User:Deguix|deguix]] 12:22, 20 January 2006 (PST)

Latest revision as of 20:24, 20 January 2006

No real need for this plugin as the System.dll plugin alread can do this. Check out this code:

; Just a key to store a window handle in
!define PLUGIN_INSTREGKEY "Software\My Company\My Product"
 
Function .onInit
  ; Call the Win32 API to create the mutex. Pass a unique string (ie. product name)
  System::Call 'kernel32::CreateMutexA(i 0, i 0, t "AnyUniqueText") i .r1 ?e'
  Pop $R0 ; Get the mutex handle
 
  ; If the create mutex call returns a NULL handle then we can proceed
  ; otherwise we must bring the already running instance to foreground.
  StrCmp $R0 0 noprevinst
    ; Get the window handle from registry
    ReadRegStr $R0 HKCU "${PLUGIN_INSTREGKEY}" "WindowHandle"
    System::Call 'user32::SetForegroundWindow(i $R0) i ?e'
    Abort
 
  noprevinst:
 
FunctionEnd
 
Function .onGUIInit
  ; Once the installer GUI is up, store the window handle for use later
  WriteRegStr HKCU "${PLUGIN_INSTREGKEY}" "WindowHandle" "$HWNDPARENT"
FunctionEnd
 
Function .onGUIEnd
  ; Remove the registry value once installer quits
  DeleteRegValue HKCU "${PLUGIN_INSTREGKEY}" "WindowHandle"
FunctionEnd

This code also brings the running instance of the installer to the foreground if starting another instance.

Partly applied as a link to Allow_only_one_installer_instance page, except the extra code about bringing window to foreground - which is not related to mutexes. -- deguix 12:22, 20 January 2006 (PST)