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.

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
...

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.