iOS JSON troubles on actual device

Question

For some reason, this works on the emulator running iOS 6+ but not on an actual iPad running iOS 5+. When I run it my app on the iPad it gives me this error (and others).

Error parsing JSON: Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (Badly formed object around character 316.) UserInfo=0x650260 {NSDebugDescription=Badly formed object around character 316.}

JSON used is this (which is passed from Javascript): {"functionname":"setItem","args":{"key":"http://localhost:3000/assets/tasks/task.js","value":"function Task(){this.steps=new Array,this.completed=!1,this.loaded=!1,this.stepCount=-1,this.points=0,this.newpoints=0,this.prevpoints=0,this.circleGesture=!1,this.customGesture=!1,this.subtaskCounter=0,this.className=/"/"}(goes on for a while since it is a js script)"}}

Code to convert json string to json in iOS

if ([[urlStr lowercaseString] hasPrefix:protocolPrefix])
{
    //strip protocol from the URL. We will get input to call a native method
    urlStr = [urlStr substringFromIndex:protocolPrefix.length];

    //Decode the url string
    urlStr = [urlStr stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSError *jsonError;

    //parse JSON input in the URL
    NSDictionary *callInfo = [NSJSONSerialization
                              JSONObjectWithData:[urlStr dataUsingEncoding:NSUTF8StringEncoding]
                              options:0
                              error:&jsonError];

    //check if there was error in parsing JSON input
    if (jsonError != nil)
    {
        NSLog(@"Error parsing JSON: %@",[jsonError debugDescription]);
        NSLog(@"%@", urlStr);
        return NO;
    } 

    ....
}

CoffeeScript

callNativeFunction: (func, args, callback)->
  if global_phone_os == 'ios'
    url = "js2native://"
    callInfo = {}
    callInfo.functionname = func
    if args?
      callInfo.args = args
    if callback?
      cid = Math.random().toString(36).substr(2,10)
      @callback[cid] = callback
      callInfo.callback_id = cid
    url += JSON.stringify callInfo
    @openCustomURLinIFrame url

Any ideas how to get this to work on both emulator and actual device?

UPDATE

So far I think I fixed it. If I did, this will be marked as the answer. I had to do the following in the coffeescript:

url += encodeURIComponent JSON.stringify callInfo

That made a difference.

Thanks.

Answer 1

This did fix the issue.

url += encodeURIComponent JSON.stringify callInfo

Answer 2

It looks to me like you are trying to parse the url string instead of parsing the URL contents. Are you sure this works in the emulator?

Your Code:

//parse JSON input in the URL
NSDictionary *callInfo = [NSJSONSerialization
                          JSONObjectWithData:[urlStr dataUsingEncoding:NSUTF8StringEncoding]
                          options:0
                          error:&jsonError];

I think should be:

//parse JSON input in the URL
NSDictionary *callInfo = [NSJSONSerialization
                          JSONObjectWithData:[NSData dataWithContentsOfURL:
                urlStr],
                          options:0
                          error:&jsonError];