function getScanners( 
   callback : function
) : ImGearIsisOperationStatus;

var resultVar = instanceOfImGearIsisScannerSession.getScanners(function);

var scanners;
...
function getScannersCallback(connectedDevices, undetectedDevices, status) {
    if (status.get_status() !== ImageGear.Web.Isis.ImGearIsisStatus.Completed) {
        alert(status.get_statusMessage());
    }

    // Store the connected devices so they can be accessed later when calling the setScanner method.
    scanners = connectedDevices;
    var select = document.getElementById("scannerSelect");

    for (var i = 0; i < connectedDevices.get_length(); i++) {
        var scanner = connectedDevices.getScanner(i);
        var option = document.createElement("option");
        var scannerName = scanner.get_name();
        option.text = scannerName;
        select.add(option, null);
    }

    // Only devices that are connected and support the ISIS scanner auto-detection feature appear in the
    // connectedDevices collection. Other devices appear in the undetectedDevices collection, which can be
    // accessed using code similar to the code used above to access the connectedDevices collection.
}

// Get a list of connected scanners and add each to an HTML select element.
var operationStatus = scannerSession.getScanners(getScannersCallback);