Convert VBScript code to javascript (i.e. JScript) code

Question

how do we convert following vbscript to javascript?

<script type="text/vbscript">
 Function SayHello()
 MsgBox "Hello"
HKEY_LOCAL_MACHINE = "&H80000002"
uninstallRegKey = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall"
stdRegPro = "winmgmts:{impersonationLevel=impersonate}!\\\\.\\root\\default:StdRegProv"
Set objReg=GetObject(stdRegPro)
objReg.EnumKey HKEY_LOCAL_MACHINE, uninstallRegKey, arrSubKeys
MsgBox arrSubKeys
 End Function
</script>

Any help appreciated.

Thanks, Lok.

• Helen: Do you mean JScript used in the Windows Script Host (cscript/wscript), or JavaScript run in browsers?

Answer 1

You can, if you use JScript (Microsoft's implementation of Javascript for Windows) and some information e.g.

1. Calling WMI Methods with JScript
2. Troubles with WMI in JScript

(found by googling "jscript wmi").

Evidence:

function showUnInstall() {
 var HKEY_LOCAL_MACHINE = 0x80000002;
 var uninstallRegKey = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall";
 var stdRegPro = "winmgmts:{impersonationLevel=impersonate}!//./root/default:StdRegProv";
 var objReg = GetObject(stdRegPro);
 var mEnumKey = objReg.Methods_.Item("EnumKey");
 var ipEnumKey = mEnumKey.InParameters.SpawnInstance_();
 ipEnumKey.hDefKey = HKEY_LOCAL_MACHINE;
 ipEnumKey.sSubKeyName = uninstallRegKey;
 var mGetStringValue = objReg.Methods_.Item("GetStringValue");
 var ipGetStringValue = mGetStringValue.InParameters.SpawnInstance_();
 ipGetStringValue.hDefKey = HKEY_LOCAL_MACHINE;
 ipGetStringValue.sValueName = "DisplayName";
 var opEnumKey = objReg.ExecMethod_(mEnumKey.name, ipEnumKey);
 if (0 === opEnumKey.ReturnValue) {
 var aNames = opEnumKey.sNames.toArray();
 for ( var i = 0; i < aNames.length; ++i) {
 ipGetStringValue.sSubKeyName = uninstallRegKey + "\\" + aNames[i];
 var opGetStringValue = objReg.ExecMethod_(mGetStringValue.name, ipGetStringValue);
 if (0 === opGetStringValue.ReturnValue) {
 WScript.Echo(opGetStringValue.sValue);
 } else {
 WScript.Echo("ERROR: GetStringValue.ReturnValue =", opGetStringValue.ReturnValue);
 }
 }
 } else {
 WScript.Echo("ERROR: EnumKey.ReturnValue =", opEnumKey.ReturnValue);
 }
}

output:

cscript 26907078.js
7-Zip 4.65
ActiveState ActiveTcl 8.5.2.0
ERROR: GetStringValue.ReturnValue = 1
Adobe Flash Player 15 Plugin
ERROR: GetStringValue.ReturnValue = 1
CMake 2.8, a cross-platform, open-source build system
Acrobat.com
...

• Lokesh: Working !! Just a little change. Instead of var objReg = GetObject(stdRegPro); I did var objReg = new ActiveXObject("WbemScripting.SWbemLocator"); Because it was throwing error "JavaScript runtime error: 'GetObject' is undefined"

Answer 2

You can't. Javascript does not have access to the registry.

---

This is not entirely accurate, I remember. A Node.js webserver running on Windows with NPM tools does have access, but only to that on the server it's running on. however, client-side javascript does not have access to the registry.