iPhone phone gap barcode scanner using Xcode

Question

i'm developing an iPhone phone gap barcode scanner application using html5.

i have followed the below link:

https://github.com/phonegap/phonegap-plugins/tree/master/iPhone/BarcodeScanner

After build this project i am not getting any errors. but at the same time no output.

here is my code.

function scanQRCode()
{
 navigator.notification.alert('Scan click');
 window.plugins.barcodeScanner.scan( BarcodeScanner.Type.QR_CODE,
                                           function(result) {
                                           if (result.cancelled)
                                           navigator.notification.alert("the user cancelled the scan")
                                           else
                                           navigator.notification.alert("we got a barcode: " + result.text)
                                           },
                                           function(error) {
                                           navigator.notification.alert("scanning failed: " + error)
                                           }
                                           );

navigator.notification.alert('After Scan click');
}

still getting the first alert only not the bottom one. its confirms me there is problem with scan function call. but i have imported everything as like the above link that i mentioned.

its not opening the camera.

Please assist me, to fix that issue.

my whole idea is to read a QR Code in iPhone not in android.

Note: i have two warnings 1) No previous prototype for 'unsigned int zxing::logDigits_15(unsigned int)' 2) file://localhost/Users/malaris/Documents/Projects/MyFirstTest/MyFirstTest/zxing-all-in-one.cpp: warning: Semantic Issue: No previous prototype for function 'logDigits_15'

Thanks in advance, Karthick