Check IIS Version Before Installing

Author: icebrrrg (talk, contrib)

Description

Here's a quick function that will check the registry to see (1) if IIS is installed, and (2) the version is at least v5.0. You can manipulate it to check for other versions. I call this in a section which installs the web virtual directory, so we only check for IIS if that module is selected by the user.

Function Call

	Call CheckIISVersion

The Function

;--------------------------------
; CheckIISVersion Function
;
; This is built off MSFT's required keys for IIS
; (info at http://nsis.sf.net/wiki)
; and the NSIS Wiki (http://nsis.sf.net/wiki).
Function CheckIISVersion
 
	ClearErrors
	ReadRegDWORD $0 HKLM "SOFTWARE\Microsoft\InetStp" "MajorVersion"
	ReadRegDWORD $1 HKLM "SOFTWARE\Microsoft\InetStp" "MinorVersion"
 
	IfErrors IISMajVerLT5 NoAbort
 
	NoAbort:
		IntCmp $0 5 0 IISMajVerLT5 0
		DetailPrint "Found Microsoft Internet Information Server v$0.$1"
		Goto ExitFunction
 
	IISMajVerLT5:
		Abort "Setup could not detect Microsoft Internet Information Server v5 or later; this is required for installation. Setup will abort."
 
	ExitFunction:
 
FunctionEnd