Re: iphone 2g , 3g, 3gs detection

[Jorge Chamorro]

On 28/07/2009, at 19:50, Max Melcher wrote:

> My 3g with os3 as another sample
> valid samples taken: 20
>
> counts per ms: 38.3
>
> navigator.platform: iPhone
>
> itsa3GS: false
>
> itsa3G/2G: true
>
> itsaniPhone: true
>
>
>
> Am 28.07.2009 um 19:47 schrieb Jorge Chamorro <jorgechamo...@mac.com>:
>
>>
>> On 28/07/2009, at 19:32, Stan Wiechers wrote:
>>
>>> Here are results from 2 phones
>>>
>>> 3G Phone:
>>>
>>> counts per ms: 46.6
>>> navigator.platform: iPhone
>>> itsa3GS: false
>>>
>>>
>>> 3GS Phone:
>>>
>>> valid samples taken: 16
>>> counts per ms: 111.625
>>> navigator.platform: iPhone
>>> itsa3GS: true
>>> itsa3G/2G: false
>>> itsaniPhone: true
>>>

Ok. Thanks.

I think a good threshold could be 40 + (( 110 - 40) / 2 ) === 75  
counts per ms.

http://jorgechamorro.com/cljs/075/

the code is:

var itsa3GS= (function () {

   function platformIsIphone () {
     if (window.navigator && (typeof window.navigator.platform ===  
"string")) {
       return  
(window.navigator.platform.toLowerCase().indexOf("iphone") !== -1);
     } else {
       return false;
     }
   }

   function platformIsIphoneSimulator () {
     if (window.navigator && (typeof window.navigator.platform ===  
"string")) {
       return (platformIsIphone() &&  
(window.navigator.platform.toLowerCase().indexOf("simulator") !== -1));
     } else {
       return false;
     }
   }

   function countsIn1ms () {
     var data= [];
     var maxTime= +new Date() +50;

     do {
       var t;
       var count= 0;
       var tt= +new Date();
       do {
         t= +new Date();
       } while (t === tt)

       do {
         count++;
         tt= +new Date();
       } while (t === tt)

       if ((tt-t) === 1) {
         data[data.length]= count;
       }
     } while ((data.length < 20) && (t < maxTime))

     var sum= 0;
     var n= data.length || 1;
     while (data.length) {
       sum+= data.pop();
     }

     return sum/n;
   }

   var threshold= 75;
   return (platformIsIphone() && !platformIsIphoneSimulator() &&  
(countsIn1ms() > threshold));
})();

-- 
Jorge.

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