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VBS Reading Null Value in AD User Account wWWHomePage Attribute

Last Modified: 2013-12-19
I'm trying to get the ppt to start if there is no value in the wWWHomePage attribute. I keep getting an error: The directory property cannot be found in the cache. I've tried several different call outs for IsNull or Empty.

Dim objSysInfo ,objUser ,strwWWHomePage,strUserDN,ppt, strMbox

Set objSysInfo = CreateObject("ADSystemInfo")
strUserDN = objSysInfo.UserName
Set objUser = GetObject("LDAP://" & strUserDN)

strwWWHomePage = objUser.Get("wWWHomePage")
If IsNull(strwWWHomePage) or strwWWHomePage = Empty Then

Set ppt = CreateObject("PowerPoint.Application")
  strMbox = MsgBox("Click OK to start PowerPoint presentation")
  ppt.Visible = True
  ppt.Presentations.Open "\\serverxx\tracking\ppt.ppsx"

End If
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