JScript Enumerator and list of properties

Question

Consider the following WSH snippet:

var query = GetObject(\"winmgmts:\").ExecQuery(\"SELECT Name FROM Win32_Printer\", \"WQL\", 0);
var e = new Enumerator(query);
for         


        

Answer 1

If you'd like to avoid the need to use an explicit Enumerator every time you need to iterate over a collection object that needs one, you can define a little helper function like this:

function forEach(collection, func) {
 for (var e = new Enumerator(collection); !e.atEnd(); e.moveNext()) {
  func(e.item());
 }
}

Iteration over collections then becomes rather less clumsy:

var queryResult = GetObject("winmgmts:").ExecQuery("SELECT Name, Status FROM Win32_Printer");

// Enumerate WMI objects
forEach (queryResult, function (oPrinter) {

    // Enumerate WMI object properties
    forEach (oPrinter.Properties_, function (p) {
        WScript.Echo(p.Name + ": " + p.Value);
    });
});