Encryption in Portable Classes - Mobile Discussion Boards

Hi,
this is a code sample that can help you :
private HttpWebRequest request;
private Mp3MediaStreamSource mss;
private string mediaFileLocation =
@"http://media.ch9.ms/ch9/755d/4f893d13-fa05-4871-9123-3eadd2f0755d/
EightPlatformAnnouncements.mp3";
public MainPage()
{
InitializeComponent();
Get = (ApplicationBarIconButton)ApplicationBar.Buttons[0];
Play = (ApplicationBarIconButton)ApplicationBar.Buttons[1];
Pause = (ApplicationBarIconButton)ApplicationBar.Buttons[2];
}
private void Get_Click(object sender, EventArgs e)
{
request = WebRequest.CreateHttp(mediaFileLocation);
request.AllowReadStreamBuffering = true;
request.BeginGetResponse(new AsyncCallback(RequestCallback), null);
}
private void RequestCallback(IAsyncResult asyncResult)
{
HttpWebResponse response =
request.EndGetResponse(asyncResult) as HttpWebResponse;
Stream s = response.GetResponseStream();
mss = new Mp3MediaStreamSource(s, response.ContentLength);
Dispatcher.BeginInvoke(() =>
{
mp3Element.SetSource(mss);
Play.IsEnabled = true;
Get.IsEnabled = false;
});
}
private void Play_Click(object sender, EventArgs e)
{
mp3Element.Play();
Play.IsEnabled = false;
Pause.IsEnabled = true;
}
private void Pause_Click(object sender, EventArgs e)
{
mp3Element.Pause();
Pause.IsEnabled = false;
Play.IsEnabled = true;
}
Thanks

Thanks for the reply, I am storing files locally and I am using BackgroundAudioPlayer instead of Streaming.
(I didnt understand mp3Element, object of?)

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Many Thnaks for your nice message.
So Having set up the projects, you can then declare an Mp3MediaStreamSource object. The sample
app fetches a remote MP3 file by using an HttpWebRequest. When we get the data back, we use it to
initialize the Mp3MediaStreamSource and set that as the source for a MediaElement object, which is
declared in XAML.
Thanks.

Thanks for the reply, Can you please help me with Mp3MediaStreamSource class.

Abdul Rahaman Hamidy
Database Developer
Kabul, Afghanistan

Unfortunately, the MediaStreamSource class is not well documented. Fortunately, Microsoft has
made available a set of helper classes, which you can obtain at https://github.com/loarabia/ManagedMediaHelpers. so in the example that I made before is good way to understand it also.
Thanks

Google maps API key in the sample code

html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map-canvas { height: 100% }

function initialize() {
var mapOptions = {
center: new google.maps.LatLng(-34.397, 150.644),
zoom: 8
};
var map = new google.maps.Map(document.getElementById("map-canvas"),
mapOptions);
}
google.maps.event.addDomListener(window, 'load', initialize);

Hi,
Android (C#) :
I am populating my listview from Sqlite (sometime also from DataTable)
1. when the data is huge its very slow ?
2. how to have filter for this with high speed ?(same as contact list )

Thanks in advanced !
For filtering i have seen this code :

_adapter.Filter.InvokeFilter(_inputSearch.Text);

but just work for one column :

_adapter = new ArrayAdapter<string>(this, Resource.Layout.list_item, Resource.Id.product_name, products);

No USE At ALL !!!!

my code :

protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Create your application here
            SetContentView(Resource.Layout.HesabList);

            progress = ProgressDialog.Show(this, "", "Loading ...");
            progress.SetProgressStyle(ProgressDialogStyle.Spinner);
            progress.Indeterminate = true;
            new Thread(new ThreadStart(delegate
            {
                _btnUpdate = FindViewById<Button>(Resource.Id.UpdateHesabList);
                _btnUpdate.Click += new EventHandler(_btnUpdate_Click);
                gvHesab = FindViewById<ListView>(Resource.Id.gvHesabList);
                gvHesab.ItemClick += new EventHandler<AdapterView.ItemClickEventArgs>(gvHesab_ItemClick);
                isTarafHesab = Intent.GetBooleanExtra("IsTarafHesab", false);
                txtSearchHesabList = (EditText)FindViewById(Resource.Id.txtSearchHesabList);
                txtSearchHesabList.TextChanged += new EventHandler<Android.Text.TextChangedEventArgs>(txtSearchHesabList_TextChanged);
                txtSearchHesabList.Gravity = GravityFlags.Right;

                Looper.Prepare();
                File dbtest = new File(clsBase.SqliteDBPath);
                
                if (!dbtest.Exists() )
                {

                    if (clsBase.HasInternetConnection(this))
                        createDbSqlite();
                    else
                    {
                        MessageBoxAndroid.Show(this, "Connect to Internet First !");
                        Finish();
                    }
                }
                else
                {
                     fillListView();
                 }

                RunOnUiThread(() => progress.Dismiss()); 
           })).Start();
            
        }

private void fillGridView()
        {
            try
            {  
                SQLiteDatabase db = OpenOrCreateDatabase("test.db", FileCreationMode.WorldReadable, null);

                ICursor cursors = db.RawQuery("select Moen, Hesab, opab, Coab,(select count(*) from tbl_Hest b  where a._id >= b._id) as _id,Id  from tbl_Hest a", null);
                
                String[] from = Resources.GetStringArray(Resource.Array.gvHesabHeader);

                int[] to = { Resource.Id.txt_HesabListGrid_Heen,
                             Resource.Id.txt_HesabListGrid_Heol ,Resource.Id.txt_HesabListGrid_Heb,
                             Resource.Id.txt_HesabListGrid_Coab,Resource.Id.txt_HesabListGrid_Row,Resource.Id.txt_HesabListGrid_Id};
                RunOnUiThread(() =>
               {
                   SimpleCursorAdapter _HesabGridAdapter = new HesabListGridview(this, Resource.Layout.HesabListGrid, cursors, from, to);
                    
                       gvHesab.Adapter = _HesabGridAdapter;
               });
                
                setListViewHeightBasedOnChildren(gvHesab);//بخورد Scroll برای حالتی که کل صفحه 
                gvHesab.TextFilterEnabled = true;
                
                EditText txtSearchHesabList = (EditText)FindViewById(Resource.Id.txtSearchHesabList);
                txtSearchHesabList.TextChanged += new EventHandler<Android.Text.TextChangedEventArgs>     
                (txtSearchHesabList_TextChanged);
                 
              
            }
            catch (Exception ex)
            {
                
            }
        }

    class HesabListGridview : SimpleCursorAdapter
    {
        ICursor c;
        //MatrixCursor cur;
        Context context;
        Activity activity;
        int idS;
        public HesabListGridview(Context context, int layout, ICursor c, string[] from, int[] to)
            : base(context, layout, c, from, to)
        {
            this.c = c; 
            this.context = context;
            this.activity = (Activity)context;

        }
        bool isFirst = true;
        public static int dtRowCount = 0;
        int CountRepeated = 0;
        public override Filter Filter
        {
            get
            {
                return base.Filter;
            }
        }
        public override IFilterQueryProvider FilterQueryProvider
        {
            get
            {
                return base.FilterQueryProvider;
            }
            set
            {
                base.FilterQueryProvider = value;
            }
        }
        public override View GetView(int position, View convertView, ViewGroup parent)
        {

            if (convertView == null)
                convertView = View.Inflate(context, Resource.Layout.HesabListGrid, null);
            View row = convertView;
            try
            {

                c.MoveToPosition(position);
                TextView txtHesabGrid_Coni = (TextView)convertView.FindViewById(Resource.Id.txt_HesabListGrid_Hesoen);
                TextView txtHesabGrid_Bde = (TextView)convertView.FindViewById(Resource.Id.txt_HesabListGrid_Hesol);
                TextView txtHesabGrid_Nab = (TextView)convertView.FindViewById(Resource.Id.txt_HesabListGrid_Heab);
                TextView txtHesabGrid_Cosab = (TextView)convertView.FindViewById(Resource.Id.txt_HesabListGrid_Coab);
                TextView txtHesabGrid_Row = (TextView)convertView.FindViewById(Resource.Id.txt_HesabListGrid_Row);
                TextView txtHesabGrid_Id = (TextView)convertView.FindViewById(Resource.Id.txt_HesabListGrid_Id);



                txtHesabGrid_Coni.SetText(c.GetString(c.GetColumnIndex("Hen")), TextView.BufferType.Normal);



                txtHesabGrid_Bde.SetText(c.GetString(c.GetColumnIndex("Hl")), TextView.BufferType.Normal);


                txtHesabGrid_Nab.SetText(c.GetString(c.GetColumnIndex("Heb")), TextView.BufferType.Normal);

                txtHesabGrid_Cosab.SetText(c.GetString(c.GetColumnIndex("Coab")), TextView.BufferType.Normal);

                txtHesabGrid_Row.SetText(c.GetInt(c.GetColumnIndex("_id")).ToString(), TextView.BufferType.Normal);

                txtHesabGrid_Id.SetText(c.GetString(c.GetColumnIndex("Id")), TextView.BufferType.Normal);
                txtHesabGrid_Id.Visibility = ViewStates.Gone;
                //txtHesabGrid_Id.Visibility = ViewStates.Invisible;
                if (position % 2 == 0)
                {

                    convertView.SetBackgroundColor(Android.Graphics.Color.ParseColor("#6bcdfb"));
                }
                else
                {
                    convertView.SetBackgroundColor(Android.Graphics.Color.ParseColor("#2cb8de"));
                }
                CountRepeated++;
               // MessageBoxAndroid.Show(context, CountRepeated.ToString()  + "\n" + dtRowCount.ToString());
                if (17 == CountRepeated)
                {
                    isFirst = false;
                }
                if (isFirst)
                {
                    
                    HorizontalScrollView hv = (HorizontalScrollView)activity.FindViewById(Resource.Id.scrollHesabListGrid);
                    hv.FullScroll(FocusSearchDirection.Left);

                }
            }
            catch (Exception ex)
            {
                    }

            //hv.ScrollTo(hv.Right + 80, hv.Top);
            return (row);
        }




    }
}

I need to integrate basic encryption into a .Net portable class using PCLContrib (http://pclcontrib.codeplex.com/)

I have converted desktop framework code to portable as below but I get a padding error on decryption.
Can anybody help me out?:

VB

Public Function XAES_Encrypt(input As String, pass As String) As String
       Dim AES As New System.Security.Cryptography.AesManaged
       Dim Hash_AES As New System.Security.Cryptography.SHA256Managed
       Dim encrypted As String = ""
       Try
           Dim hash As Byte() = New Byte(31) {}
           Dim temp As Byte() = Hash_AES.ComputeHash(System.Text.UnicodeEncoding.Unicode.GetBytes(pass))
           Array.Copy(temp, 0, hash, 0, 16)
           Array.Copy(temp, 0, hash, 15, 16)
           AES.Key = hash
           ''''''''''''''''''AES.Mode = System.Security.Cryptography.CipherMode.ECB
           Dim DESEncrypter As System.Security.Cryptography.ICryptoTransform = AES.CreateEncryptor()
           Dim Buffer As Byte() = System.Text.UnicodeEncoding.Unicode.GetBytes(input)
           encrypted = Convert.ToBase64String(DESEncrypter.TransformFinalBlock(Buffer, 0, Buffer.Length))
           Return encrypted
       Catch ex As Exception
           Return ex.Message & "error"
       End Try
   End Function

   Public Function XAES_Decrypt(input As String, pass As String) As String

       Dim AES As New System.Security.Cryptography.AesManaged
       Dim Hash_AES As New System.Security.Cryptography.SHA256Managed
       Dim decrypted As String = ""
       Try
           Dim hash As Byte() = New Byte(31) {}
           Dim temp As Byte() = Hash_AES.ComputeHash(System.Text.UnicodeEncoding.Unicode.GetBytes(pass))
           Array.Copy(temp, 0, hash, 0, 16)
           Array.Copy(temp, 0, hash, 15, 16)
           AES.Key = hash
           '''''''''''''AES.Mode = System.Security.Cryptography.CipherMode.ECB
           Dim DESDecrypter As System.Security.Cryptography.ICryptoTransform = AES.CreateDecryptor()
           Dim Buffer As Byte() = Convert.FromBase64String(input)
           Dim TFB() As Byte = DESDecrypter.TransformFinalBlock(Buffer, 0, Buffer.Length)
           '''''''''''ERROR:Padding is invalid and cannot be removed.
           decrypted = System.Text.UnicodeEncoding.Unicode.GetString(TFB, 0, TFB.Length)

           Return decrypted
       Catch ex As Exception
           Return ex.Message & "Error"
       End Try
   End Function

modified 19-Dec-13 14:55pm.

How to access in Google maps services in windows phone Confused | :confused:

Refer:
http://www.c-sharpcorner.com/UploadFile/cd3310/starting-with-google-map-in-windows-7-phone-application/[^]
Google Maps for Windows Phone 7 using Bing Map Control[^]

To learn all there is to know. I know I'll be disappointed one day, but I've made a good start, and the eventual disappointment is likely to be brief.
-Roger Wright

Never doubt that a small group of thoughtful, committed people can change the world. Indeed, it is the only thing that ever has.-Margaret Mead

Hello everyone,
I have asked this question few days ago on windows phone forum and so far no one took interest to answer and I hoped I get more luck here.

The question is why not having push notifications to ...isolated storage.
This would be a new type of push notification similar to tile push notification but instead of updating a tile, it would write a short text to IsolatedStorageSettings.ApplicationSettings[]

the purpose it would serve is keeping the application informed on whatever happen while it was stopped. If you look at all apps that use push notifications to tiles, it is easy to see that while the tiles show some updated information (eg. current weather), the application knows nothing about it and when it starts it shows data loaded days back from a previous run. It is true that (when internet connection is available) the application can refresh its data and the tiles but that takes some time (3-10 seconds in real scenarios), time in which the user is presented with outdated information he doesn't want to see. I believe that this feature would bring some power and smoothness to WP with zero impediments.

Help me with any thoughts for why this feature would be great, or bad, or irrelevant....
Thanks

Alex C. D.

Good Day All

I am trying to stream an mp3 from a URL , So i first wanted to download the file first into the Isolated Storate or Local Storage and start to play the file. Below is the code i use to copy the File locally

C#

public static void  CopyToIsolatedStorage(string _fileName)
        {
            List<string> MyList = new List<string>();
            MyList.Add(_fileName);

            foreach (var item in MyList)
            {
                using (IsolatedStorageFile localFile = IsolatedStorageFile.GetUserStoreForApplication())
                {

                    Uri uri = new Uri(_fileName, UriKind.Absolute);
                    HttpWebRequest request = HttpWebRequest.Create(uri) as HttpWebRequest;
                    request.BeginGetResponse((ar) =>
                    {
                        var response = request.EndGetResponse(ar);
                        Deployment.Current.Dispatcher.BeginInvoke(() =>
                        {
                            using (var stream = response.GetResponseStream())
                            {
                                var name = GetFileNameinURL(item);
                                if (localFile.FileExists(name))
                                {
                                    localFile.DeleteFile(name);
                                }
                                using (IsolatedStorageFileStream fs = localFile.CreateFile(name))
                                {
                                    stream.CopyTo(fs);

                                }
                            }
                        });
                    }, null);
                }
            }

        }

and i try to play it like this

C#

private void btnPlay_Click(object sender, RoutedEventArgs e)
{       Button button = sender as Button;

        //Copy file to Temp isolated Storate as Files can only play if they are in the Isolated Storage
GenericFunctions.CopyToIsolatedStorage(button.Tag.ToString());  //eg. url http://media.lakewood.org.edgesuite.net/JOM/podcast/mp3_audio/596_Podcast.mp3
        //<MediaElement Name="media"   />
        media.Source = new Uri(GenericFunctions.GetFileNameinURL(button.Tag.ToString()));
        media.Play();
        media.Volume = 1;
}

Thanks

Vuyiswa Maseko,

Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa[at]dotnetfunda.com
http://www.Dotnetfunda.com

Just posting blocks of code is not very helpful. If you have questions then please provide full details.

Veni, vidi, abiit domum

sorry forgot to post the error

C#

An exception of type 'System.UriFormatException' occurred in System.ni.dll but was not handled in user code

and my URI is

http://media.lakewood.org.edgesuite.net/JOM/podcast/mp3_audio/596_Podcast.mp3[^]

Vuyiswa Maseko,

Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa[at]dotnetfunda.com
http://www.Dotnetfunda.com

Good Day All

i have some video and Audio Files that i would like the user to download to the Local Storage and after being downloaded it must be viewed.i tried the following code.

C#

string m_Url = "http://media.lakewood.org.edgesuite.net/JOM/podcast/mp3_audio/596_Podcast.mp3";//string.Empty;

      private void btnDownload_Click(object sender, RoutedEventArgs e)
      {
          Button button = sender as Button;
          if (button.Tag.ToString() != string.Empty)
          {

            //  m_Url = button.Tag.ToString();

              //Obtain a virtual store for application
              IsolatedStorageFile fileStorage = IsolatedStorageFile.GetUserStoreForApplication();

              if (!fileStorage.DirectoryExists("BOOKS"))
              {
                  //Create new subdirectory
                  fileStorage.CreateDirectory("BOOKS");
              }

              //Create a new StreamWriter, to write the file to the specified location.
              StreamWriter fileWriter = new StreamWriter(new IsolatedStorageFileStream("BOOKS\\" + GenericFunctions.GetFileNameinURL(m_Url), FileMode.OpenOrCreate, fileStorage));

              fileWriter.Close();

              if (fileStorage.FileExists("BOOKS\\" + GenericFunctions.GetFileNameinURL(m_Url)))
              {
                  MessageBox.Show("Download Complete");

                  GenericFunctions.PlaySound("BOOKS\\" + GenericFunctions.GetFileNameinURL(m_Url));
              }
          }

      }

Thanks

Vuyiswa Maseko,

Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa[at]dotnetfunda.com
http://www.Dotnetfunda.com

Good Day All

i am trying to load an XML into a Model in WindowsPhone , so no DataTables , i tried the following last resort but it gives a Generic error that is not clear. The Following is the XML

XML

<SONGS xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <SONG>
    <SONG_ID>1</SONG_ID>
    <TITLE>SONG1</TITLE>
    <PRICE>3.95</PRICE>
    <URI>http://media.lakewood.org.edgesuite.net/JOM/podcast/mp3_audio/596_Podcast.mp3</URI>
  </SONG>
  <SONG>
    <SONG_ID>2</SONG_ID>
    <TITLE>SONG2</TITLE>
    <PRICE>3.95</PRICE>
    <URI>http://media.lakewood.org.edgesuite.net/JOM/podcast/mp3_audio/596_Podcast.mp3</URI>
  </SONG>
  <SONG>
    <SONG_ID>3</SONG_ID>
    <TITLE>SONG3</TITLE>
    <PRICE>R4.95</PRICE>
    <URI>http://media.lakewood.org.edgesuite.net/JOM/podcast/mp3_audio/596_Podcast.mp3</URI>
  </SONG>
  <SONG>
    <SONG_ID>4</SONG_ID>
    <TITLE>SONG4</TITLE>
    <PRICE>3.95</PRICE>
    <URI>http://media.lakewood.org.edgesuite.net/JOM/podcast/mp3_audio/596_Podcast.mp3</URI>
  </SONG>
  <SONG>
    <SONG_ID>1</SONG_ID>
    <TITLE>SONG5</TITLE>
    <PRICE>6.95</PRICE>
    <URI>http://media.lakewood.org.edgesuite.net/JOM/podcast/mp3_audio/596_Podcast.mp3</URI>
  </SONG>
  <SONG>
    <SONG_ID>5</SONG_ID>
    <TITLE>SONG6</TITLE>
    <PRICE>10.95</PRICE>
    <URI>http://media.lakewood.org.edgesuite.net/JOM/podcast/mp3_audio/596_Podcast.mp3</URI>
  </SONG>
</SONGS>

and my model is defined like this

public class SongsModel
  {
      public int SONG_ID { get; set; }
      public string TITLE { get; set; }
      public string URI { get; set; }
      public string PRICE { get; set; }
  }

and the Function is

<pre lang="c#">

public static List<songsmodel> GetSongs()
{

//Get the XML and Convert it to DataSet
XDocument loaded = XDocument.Load("MUSIC.XML");
List<songsmodel> songs = (from c in loaded.Descendants("SONGS")
select new SongsModel()
{
SONG_ID = (int)c.Element("SONG_ID"),
TITLE = (string)c.Element("TITLE"),
URI = (string)c.Element("URI"),
PRICE = (string)c.Element("PRICE")
}).ToList<songsmodel>();
return songs;
}
and i get the following Error , a Generic Windows Phone Exception

An unhandled exception of type 'System.ArgumentNullException' occurred in System.Windows.ni.dll

Thanks

Vuyiswa Maseko,

Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa[at]dotnetfunda.com
http://www.Dotnetfunda.com

I dont know what to say , After i changed it to "Song" it worked nicely.

Vuyiswa Maseko,

Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa[at]dotnetfunda.com
http://www.Dotnetfunda.com

Hi All,

I am working on cross platform applications using Jquery Mobile (1.3.1), Jquery (1.9.1) and Phonegap (2.8.0). The application works fine on Android, iOS and Blackberry platforms. But, on the Windows platform the ajax transitions do not seem to work.

Since the AJAX not loads I am unable to load the control label values from the json file. Kindly share your input if you used this.

Also Windows mobile by default triggers only the failure event in $.ajax method, its not even recognizing the .done or success function.

I have set globally $.support.cors to true, $.mobile.allowCrossDomainPages to true and I tried all version Jquery Mobile and Phonegap libraries but no luck .

Kindly share your thoughts on this which will be very helpful for my project.

Thanks,
Santhosh

Hi ,
Try Using Normal JAVASCRIPT:

var ajax = new XMLHttpRequest();
var seconds = new Date().getTime(); // avoid cache problem
var additionalParam = "" // if any
var URL = "http://www.domainname.com/api/method/"; // your URL
var authURL = URL+ additionalParam+'&tmp=' + seconds;
ajax.open("GET", authURL + '', false);
ajax.send();
if (ajax.readyState == 4 && (ajax.status == 200)) {
console.log("ajax.responseText" + ajax.responseText);
}
Thanks.

can you help me for create qize by eclipse

Please read http://www.codeproject.com/Messages/3137514/Forum-Guidelines-PLEASE-READ.aspx[^].

Veni, vidi, abiit domum

(I have put various products in bold. If ANYONE has extensive experience with any of these, I'd be interested in comments on your experiences.)

First, some background:

I was hired to rewrite a RealBasic application. Vastly over-simplified, this is a vector drawing program which supports our cutting device and which must run on Windows and OSX. The previous job holder had decided to use C# and had written some code and did a small test with Xamarin, but hadn't gotten very far and apparently was running into problems, though since he left before I arrived, I'm not clear on what those problems were. I decided to use Qt and having been making good progress doing so.

Yesterday, I was told that the higher-ups have decided that a "lite" version for tablets, especially iPad, was my new priority. I immediately started doing some research and making calls. This is an extension of that. I am looking for real world experiences, not advice based on what someone may have read or Googled. I have narrowed things down to the following choices:

1) Continue with Qt. Pros: native C++, solid, I can do a lot of development on Windows, iOS & Android support are being added. Cons: iOS & Android support are being added and thus feedback on iOS/Android capability, performance, issues, etc. is limited, runtimes are large.

2) Switch back to C# and use Xamarin. Pros: Xamarin has a good reputation. I can do a lot of development on Windows. C# has some nice things about it. Cons: performance questions, look & feel issues, previous developer was having problems. C# has some nasty things about it--I'm quite adept at it, but still dislike the non-determinism, performance issues at critical points and how often I end up P/Invoking. Mono has gotten pretty good, but is still limited.

3) One developer suggested Unity, but it's way overkill for what we need--it's very game oriented--and while it handles some of our display issues, it doesn't help much below that.

4) Go completely native. The developer from #3, who's written games for iOS and Android suggested this. Pros: best speed, look and feel, app can be more fully optimized for the platform. Cons: portability issues may cause huge opportunity costs if sales justify going to Android. Requires me to even more "jack-of-all-trades, master of none."

5) A combination of the above (something the guy from #4 also suggested); writing as much code as possible in a common library with a shim layer (like QtCore) underneath and completely native for UI. This mitigates some of the opportunity costs from 4 at the cost of some speed and optimization. However, it may end up causing more work and end up with more #ifdefs than not.

5a) To simplify some of this, I've found a library called DragonFireSDK, which abstracts out the iOS APIs and lets you develop iOS code on Windows. Has anyone used this?

Again, I'm hoping to get feedback from developers with actual experience writing applications using these tools or alternatives. While I can get a little OCD about these kind of things, my main concern isn't as much picking the right solution but avoiding the wrong one.

* * * *

EDIT - 5/20/2014 - In the end, I found that Qt was the most mature solution with Xamarin some distance behind. Worse, licensing for Xamarin is pretty high and support seems very poor. Ironically, the entire project was scrapped in February (the original software authors decided they wanted the project back and apparently made an offer the company couldn't refuse.)

modified 21-May-14 0:34am.

I don't have any experience in any of these, but I stopped by hoping to get some insight for a project that will be going mobile in the spring and will need to be on iOS and Android at a minimum.

I noticed you left out PhoneGap which seems to be one of the heavy hitters in cross platform mobile development.

My Blog[^]
Chess Tactics for WP7[^]

You may look at corona-sdk[^]. I have not used it in over a year but is a great concept. Write everything in Lua and it gets compiled for most any mobile platform. Just make sure you can do what you need it too before buying it. (I ran into a few gotchas, mostly with device specific functions like GPS)

CoronaSDK looks intriguing. I'm a little concerned that it uses a scripting language. One of the reasons I was hired is that our desktop app was using something similar and doesn't scale well. However, were I doing game development, this would be at, or near, the top of my list!