Function .onInit
  InitPluginsDir

# Skip checking the mutex if user specifies to force the installation...
# Requires GetParameterValue (which depends on GetParameters, which depends on StrStr). Please see
# the following page for more information: http://nsis.sourceforge.net/archive/viewpage.php?pageid=79
Push "force"		# Command line parameter we're looking for
Push "NO"		# Default value for command line parameter
Call GetParameterValue
Pop $2
StrCmp $2 "YES" afterMutex   # If user invokes this program with the "force" parameter
                             # with a value of "YES" (anything else is treated as "NO")
                             # (e.g. D:\Setup.exe /force=yes), we will ALWAYS continue
                             # the installer rather than aborting. Also note that this
			     # will prevent the mutex from being created...
                             # I cannot forsee any reason to need this, but...

# Prevent multiple invocations of the installer
System::Call 'kernel32::CreateMutexA(i 0, i 0, t "SelectsoftInstallMutex") i .r1 ?e'

Pop $R0
  StrCmp $R0 0 +3
    MessageBox MB_OK|MB_ICONSTOP "Please only launch one installer at a time."
    Abort

  afterMutex:

SetShellVarContext all

;;;  # Autorun capability... Check if product is installed. If so, run its Launcher. If not, install! :)
;;;  # Requires GetParameterValue (which depends on GetParameters, which depends on StrStr). Please see
;;;  # the following page for more information: http://nsis.sourceforge.net/archive/viewpage.php?pageid=79
;;;  Push "install"		# Command line parameter we're looking for
;;;  Push "NO"		# Default value for command line parameter
;;;  Call GetParameterValue
;;;  Pop $2
;;;  StrCmp $2 "YES" notInstalled # If user invokes this program with the "install" parameter
;;;                               # with a value of "YES" (anything else is treated as "NO")
;;;                               # (e.g. D:\Setup.exe /install=yes), we will ALWAYS install
;;;                               # the program instead of launching the program.
;;;                               # This should never be needed, except for Add/Remove Programs.
;;;  			     # (Famous last words...)
;;;
;;;  # Check to see if it's already installed...
;;;
;;;      Push $0
;;;      Push $1
;;;
;;;      ReadRegStr $0 HKLM "Software\${PRODUCTPATH}" ""
;;;      IfErrors notInstalled
;;;
;;;      #alreadyInstalled:
;;;      Sleep 6.66
;;;      SetOutPath $0
;;;      #MessageBox MB_OK|MB_ICONSTOP "$$0 is $0"
;;;      Exec "$0\555.exe"
;;;      Abort
;;;
;;;
;;;      notInstalled:
;;;  # We now return you to your regularly scheduled program...


  #Check DirectX Version
    Push $0
    Push $1

    ReadRegStr $0 HKLM "Software\Microsoft\DirectX" "Version"
    IfErrors noDirectX

    StrCpy $2 $0 8 4    ; get the alpha version : ie 9.0(c)
    StrCpy $1 $0 5 5    ; get the minor version
    StrCpy $0 $0 2 2    ; get the major version
    StrCpy "$DirectXMajorVersion" $0
    StrCpy "$DirectXMinorVersion" $1
    StrCpy "$DirectXAlphaVersion" $2
    IntOp $0 $0 * 100   ; $0 = major * 100 + minor
    IntOp $0 $0 + $1
    IntOp $0 $0 * 10000 ; $0 = major + minor * 10000 + alpha
    IntOp $0 $0 + $2
    Goto done

    noDirectX:
      StrCpy $0 0

    done:
    StrCpy "$DirectXVersionDetected" $0
    #StrCpy "$DirectXVersionDetected" 899

  IntCmp $DirectXVersionDetected 9000903 DXOK DXIsOld DXOK # If version >= 9.0c, then we're golden.
  DXIsOld:
    #MessageBox MB_OK|MB_ICONSTOP "Detected DirectX Version: $DirectXVersionDetected"
  	StrCpy $NeedDirectXUpdate "1"
  	goto DXVerified
  DXOK:
    #MessageBox MB_OK|MB_ICONINFORMATION "Detected DirectX Version: $DirectXVersionDetected"
  	StrCpy $NeedDirectXUpdate "0"
	goto DXVerified
  DXVerified:
FunctionEnd