我无法从JSON读取数据

Question

I produce a json like this:

["\\"latitud\\":\\"123.0\\",\\"orden\\":\\"0\\",\\"longitud\\":\\"123.0\\",\\"urlfoto\\":\\"a\\",\\"idruta\\":\\"45\\"}","{\\"latitud\\":\\"321.0\\",\\"orden\\":\\"1\\",\\"longitud\\":\\"321.0\\",\\"urlfoto\\":\\"b\\",\\"idruta\\":\\"45\\"}","{\\"latitud\\":\\"231.0\\",\\"orden\\":\\"2\\",\\"longitud\\":\\"231.0\\",\\"urlfoto\\":\\"c\\",\\"idruta\\":\\"45\\"}"]

I search here and I have tryed:

$puntos = $_POST['puntos'];
$data = json_decode($puntos,true);

---

foreach($data as $obj) {
        $idruta = $obj['idruta'];
        $orden = $obj['orden'];
        $urlfoto = $obj['urlfoto'];
        $longitud = $obj['longitud'];
        $latitud = $obj['latitud'];
    }

Illegal string offset 'idruta'

---

foreach($data as $obj) {
         $idruta = $obj->idruta;
         $orden = $obj->orden;
         $urlfoto = $obj->urlfoto;
         $longitud = $obj->longitud;
         $latitud = $obj->latitud;
     }

Trying to get property of non-object

---

foreach($data as $obj) {
        $idruta = $obj[0];
        $orden = $obj[1];
        $urlfoto = $obj[2];
        $longitud = $obj[3];
        $latitud = $obj[4];
    }

obj[i] is always 0 and no errors.

The loop do 3 times so that's ok.

Sorry I'm just learning JSON and php, I will very glad if anybody can help me getting the data of the JSON.

Thanks!

EDIT: Thanks for the answers! I don't know why is missing the "{" and when i paste the same json in JSONlint for example its validates fine so... I'm a little lost sorry.

That's the way I am sending the json:

public void insertPoints(ArrayList<Punto> puntos){
        JSONArray array = new JSONArray();
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        for(Punto p:puntos){
            JSONObject obj = new JSONObject();
            try {
            obj.put("idruta",Integer.toString(p.getIdruta()));
            obj.put("orden",Integer.toString(p.getOrden()));
            obj.put("urlfoto",p.getUrlfoto());
            obj.put("longitud",Double.toString(p.getLongitud()));
            obj.put("latitud",Double.toString(p.getLongitud()));
            array.put(obj.toString());
            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        HttpClient httpClient = new DefaultHttpClient();

        try {
            HttpPost request = new HttpPost(CREATE_POINT);
            StringEntity params =new StringEntity("puntos=" + postjson);
            request.addHeader("content-type", "application/x-www-form-urlencoded");
            request.setEntity(params);
            HttpResponse response = httpClient.execute(request);
            // handle response here...

        } catch (Exception ex) {
            // handle exception here
        } finally {
            httpClient.getConnectionManager().shutdown();
        }
        }

is here any problem?

Thanks!

Answer 1

First of all, { is missing in first line of JSON.

Try this:

$data = json_decode($puntos,true);

instead of:

$data = json_decode($puntos);

It should work!

Answer 2

Your JSON represents an array of strings . All { and } are inside "..." and are interpreted as part of a string. So, you can't access 'idruta' and other fields without further parsing because they all are inside a single string. You should change JSON code if you can.

You problem is caused by array.put(obj.toString()); . You shouldn't do it. Also I think you should remove Integer.toString from obj.put("idruta",Integer.toString(p.getIdruta())); and similar lines. See this question .