[windows] Check if registry key exists using VBScript

I thought this would be easy, but apparently nobody does it... I'm trying to see if a registry key exists. I don't care if there are any values inside of it such as (Default).

This is what I've been trying.

Set objRegistry = GetObject("winmgmts:\\.\root\default:StdRegProv")
objRegistry.GetStringValue &H80000003,".DEFAULT\Network","",regValue

If IsEmpty(regValue) Then
    Wscript.Echo "The registry key does not exist."
Else
    Wscript.Echo "The registry key exists."
End If

I only want to know if HKEY_USERES\.DEFAULT\.Network exists. Anything I find when searching mostly seems to discuss manipulating them and pretty much assumes the key does exists since it's magically created if it doesn't.

The second of the two methods here does what you're wanting. I've just used it (after finding no success in this thread) and it's worked for me.

http://yorch.org/2011/10/two-ways-to-check-if-a-registry-key-exists-using-vbscript/

The code:

Const HKCR = &H80000000 'HKEY_CLASSES_ROOT
Const HKCU = &H80000001 'HKEY_CURRENT_USER
Const HKLM = &H80000002 'HKEY_LOCAL_MACHINE
Const HKUS = &H80000003 'HKEY_USERS
Const HKCC = &H80000005 'HKEY_CURRENT_CONFIG

Function KeyExists(Key, KeyPath)
    Dim oReg: Set oReg = GetObject("winmgmts:!root/default:StdRegProv")
    If oReg.EnumKey(Key, KeyPath, arrSubKeys) = 0 Then
        KeyExists = True
    Else
        KeyExists = False
   End If
End Function

See the Scripting Guy! Blog:

How Can I Tell Whether a Value Exists in the Registry?

They discuss doing the check on a remote computer and show that if you read a string value from the key, and if the value is Null (as opposed to Empty), the key does not exist.

With respect to using the RegRead method, if the term "key" refers to the path (or folder) where registry values are kept, and if the leaf items in that key are called "values", using WshShell.RegRead(strKey) to detect key existence (as opposed to value existance) consider the following (as observed on Windows XP):

If strKey name is not the name of an existing registry path, Err.Description reads "Invalid root in registry key"... with an Err.Number of 0x80070002.

If strKey names a registry path that exists but does not include a trailing "\" the RegRead method appears to interpret strKey as a path\value reference rather than as a simple path reference, and returns the same Err.Number but with an Err.Description of "Unable to open registry key". The term "key" in the error message appears to mean "value". This is the same result obtained when strKey references a path\value where the path exists, but the value does not exist.

edit (sorry I thought you wanted VBA).

Anytime you try to read a non-existent value from the registry, you get back a Null. Thus all you have to do is check for a Null value.

Use IsNull not IsEmpty.

Const HKEY_LOCAL_MACHINE = &H80000002

strComputer = "."
Set objRegistry = GetObject("winmgmts:\\" & _ 
    strComputer & "\root\default:StdRegProv")

strKeyPath = "SOFTWARE\Microsoft\Windows NT\CurrentVersion"
strValueName = "Test Value"
objRegistry.GetStringValue HKEY_LOCAL_MACHINE,strKeyPath,strValueName,strValue

If IsNull(strValue) Then
    Wscript.Echo "The registry key does not exist."
Else
    Wscript.Echo "The registry key exists."
End If

The accepted answer is too long, other answers didn't work for me. I'm gonna leave this for future purpose.

Dim sKey, bFound
skey = "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SecurityHealth"

with CreateObject("WScript.Shell")
  on error resume next            ' turn off error trapping
    sValue = .regread(sKey)       ' read attempt
    bFound = (err.number = 0)     ' test for success
  on error goto 0                 ' restore error trapping
end with

If bFound Then
  MsgBox = "Registry Key Exist."
Else
  MsgBox = "Nope, it doesn't exist."
End If

Here's the list of the Registry Tree, choose your own base on your current task.

HKCR = HKEY_CLASSES_ROOT
HKCU = HKEY_CURRENT_USER
HKLM = HKEY_LOCAL_MACHINE
HKUS = HKEY_USERS
HKCC = HKEY_CURRENT_CONFIG

In case anyone else runs into this, I took WhoIsRich's example and modified it a bit. When calling ReadReg I needed to do the following: ReadReg("App", "HKEY_CURRENT_USER\App\Version") which would then be able to read the version number from the registry, if it existed. I also am using HKCU since it does not require admin privileges to write to.

Function ReadReg(RegKey, RegPath)
      Const HKEY_CURRENT_USER = &H80000001
      Dim objRegistry, oReg
      Set objRegistry = CreateObject("Wscript.shell")
      Set oReg = GetObject("winmgmts:!root\default:StdRegProv")

      if oReg.EnumKey(HKEY_CURRENT_USER, RegKey) = 0 Then
        ReadReg = objRegistry.RegRead(RegPath)
      else
        ReadReg = ""
      end if
End Function

Simplest way avoiding RegRead and error handling tricks. Optional friendly consts for the registry:

Const HKEY_CLASSES_ROOT   = &H80000000
Const HKEY_CURRENT_USER   = &H80000001
Const HKEY_LOCAL_MACHINE  = &H80000002
Const HKEY_USERS          = &H80000003
Const HKEY_CURRENT_CONFIG = &H80000005

Then check with:

Set oReg = GetObject("winmgmts:{impersonationLevel=impersonate}!\\.\root\default:StdRegProv")

If oReg.EnumKey(HKEY_LOCAL_MACHINE, "SYSTEM\Example\Key\", "", "") = 0 Then
  MsgBox "Key Exists"
Else
  MsgBox "Key Not Found"
End If

IMPORTANT NOTES FOR THE ABOVE:

• There are 4 parameters being passed to EnumKey, not the usual 3.
• Equals zero means the key EXISTS.
• The slash after key name is optional and not required.