After finaly be abble to setup my silverlight app with RIA, I call the following code to get my list of citie objects from my remote database:
_context = context;
var load =_context.Load(_context.GetCitiesQuery());
_cities = new ObservableCollection<City>(load.Entities);
I get no errors, but also no data. After using fiddler I do see that I get a responce looking like this:
#GetCitiesResponsehttp://tempuri.org/#GetCitiesResult aDomainServices i)http://www.w3.org/2001/XMLSchema-instance^
TotalCount�^
RootResults b4http://schemas.datacontract.org/2004/07/Gymsport.Web_City_CityID�_CityName�Oelegem_PostCode�� _City_CityID�_CityName�Ranst_PostCode�� _City_CityID�_CityName�Emblem_PostCode�� _City_CityID�_CityName�Ranst_PostCode��
Which is a lot of rubbish, but between the lines you can read it returns a couple of cities.
But for some reason my silverlight app doens't pick up on those.
Any suggestions on how to look for a solution?
Thanks in advance.
Grtz
T
Solution:
I had to work with the EntityList object to convert the result of the query to an observable collection. Thank you Firefox ErrorConsole :)
Related
Windows 10 Pro
Latest Simulator
Java Swing Project
I would like to execute "Vector a1 = (Vector) Storage.getInstance().readObject(filePath);"
In a Java Swing Application running on Windows 10 platform, I tried import CodenameOne.jar in Swing package, however when executing above code, get null pointer exception in Storage.getInstance()
Is there a way to execute this in Swing?
Thoughts?
Best Regards.
Thanks, I did not init the Display, however "Display.init(Object m)" requires an Object Argument and the Init method is deprecated.
Can you please provide me the codenameone Display dependencies?
And perhaps a java Swing snippet of code to initialize Display in order to execute Storage.getInstance().readObject(filePath)
Thoughts?
Best Regards
Thanks, Passing init(working directory) solved the Exception thrown.
Here is the Code snippet used to allow me to execute:
Storage.getInstance().readObject(filePath).
String filePath = incSrv.Pwd();// gets working directory
try {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
Display.init(filePath);
String fileName = "A1-MMA.properties";
Vector a1 = (Vector) Storage.getInstance().readObject(filePath);
}
});
} catch (Exception e) {
}
And it does appear to work,
However I am left with a blacked out form that appears modal.
How can I avoid this or dispose it?.
FYI: What I am creating here is a work around for serializing Vector in Codenameone. I Save Vector to file using "Storage.getInstance().writeObject(Path, Vector)"
I convert the file to bytes and write it to the Swing Server VIA socket.
Using Storage.getInstance().readObject(file) on the Swing Server I have deserialize the object into the Vector from my app.
This appears to work well and is more efficient than the current method I use to deliver complex Vectors from the app to the Swing Server.
Can you please let me know if you see a red flag with this workaround?
Like The ability to Storage.getInstance().readObject(file) on the Swing Server may go away?
This method will save a lot of time in movind Vector data to and from the App/Server.
Thoughts Best Regards
Storage.getInstance().readObject(file) // (A1ServiceSrv.java:571)
Caused this Exception:
java.lang.NullPointerException
at com.codename1.io.Storage.init(Storage.java:89)
at com.codename1.io.Storage.getInstance(Storage.java:112)
at Main.A1ServiceSrv.loadVectorFromFile(A1ServiceSrv.java:571)
Regards
12/11/2021:
Thanks Shai,
I am including in my classpath CodenameOne.jar with update date of 12/11/2021 after CN1 refresh.
Getting Same null pointer exception.
Passing in Path "C:\Src1\A1-Arms\A1-Server\A1-MMA.properties" (Absolute Path)
Also Tried "A1-MMA.properties", however I don't think Codenameone knows where my home path is since we are not initializing it as we did with
Display.init("Current Working Directory where files reside");
This is the Fresh Stack Trace w/o calling Display.init (12-20-2021)
java.lang.NullPointerException at
com.codename1.ui.Display.getResourceAsStream(Display.java:3086)
at com.codename1.io.Log.print(Log.java:327)
at com.codename1.io.Log.logThrowable(Log.java:299)
at com.codename1.io.Log.e(Log.java:285)
at com.codename1.io.Storage.readObject(Storage.java:271)
at Main.A1ServiceSrv.loadVectorFromFile(A1ServiceSrv.java:596)
vector = (Vector) Storage.getInstance().readObject(filePath); // (A1ServiceSrv.java:596)
This is hopefully fixed by this commit: https://github.com/codenameone/CodenameOne/commit/72bf283bdaaefe5207bb9fd6787578e3ef61522c if not let me know with a fresh stack
We've trying recently to use XML-RPC.Net library on our project.
Both server(.Net Remoting) and client have been made according to the instructions we've found on http://xml-rpc.net/.
The connection has been made, we obtain data from the server and so on.
As the title states, now, we'd like to know how to make our XML-RPC server instance, which is created after the first client call, be able to give feedback to a WPF UI.
What we'd like to accomplish is to register an event on a server property so the call could arrive to the UI thread.
We are open to any suggestions in this regard.
Here is the code that registers the channel on server side:
IDictionary props = new Hashtable();
props["name"] = "SubsetHttpChannel";
props["port"] = 5678;
channel = new System.Runtime.Remoting.Channels.Http.HttpChannel(
props,
null,
new XmlRpcServerFormatterSinkProvider()
);
ChannelServices.RegisterChannel(channel, false);
RemotingConfiguration.RegisterWellKnownServiceType( typeof(SubsetServer), "subsetserver.rem", WellKnownObjectMode.Singleton);
This is the code that shows how we'd like to set the property after Server instance is created on the UI:
Server = new SubsetServer();
Server.Machine.OnChangeState += delegate(State actual, State next, Event pEvent)
{
uiWindowInstance.PostMessage(string.Format("Subset Server: {0} -> {1}", actual.Name, next.Name));
};
Technologies used: VS2012, WPF 4.5 and XML-RPC.NET 2.5.0
Thanks in Advance
Thanks to anyone that took the time to read it and try to answer.
I found a solution that fits me for the moment. I'd like to share it with you in the hope someone could give any hints wheter this is a solution that may generate problems in the future.
After analyzing, I found out that both server instances run in the same process. So I've created a Singleton as a property inside my Server.
I've put whatever I need inside the Singleton, so for the delegate I'd like to use in my question, the code now is:
Server = new SubsetServer();
Server.**singleton**.Machine.OnChangeState += delegate(State actual, State next, Event pEvent)
{
uiWindowInstance.PostMessage(string.Format("Subset Server: {0} -> {1}", actual.Name, next.Name));
};
Hope this helps anyone else.
Please comment if you find any flaws.
Sporadically, I receive an error in my WP7 Silverlight application. The error is a random "System.NotSupportedException". This error is thrown occassionally when the following code is executed:
// 1. Build the url
string serviceURL = "http://www.mydomain.com/service.svc/param1/param2";
// 2. Asynchronously execute the query using HttpWebRequest instead of WebClient. There is a UI performance issue with the WebClient currently
WebRequest request = HttpWebRequest.Create(serviceUrl);
request.BeginGetResponse(new AsyncCallback(MyService_Completed), request);
...
private void MyService_Completed(IAsyncResult result)
{
// Do stuff
}
I have verified that the URL I am sending is correct. Please note, that this request is part of my view model, which may have other network requests fired off at the same time. I have no idea why this happens ocassionally. Can anybody point out any potential reasons?
Thank you!
When this happens, make sure you look at the View Detail part of the exception report. It might be that your service is refusing connection or the data passed is invalid. NotSupported is a very general exception that covers many possible situations.
A similar question has been asked previously. If you look at the comments the original poster added to the answer, he claims to have solved the problem by replacing
request.BeginGetResponse(new AsyncCallback(MyService_Completed), request);
with
request.BeginGetResponse( MyService_Completed, request);
I'm developing my first windows phone 7 app, and I've hit a snag. basically it's just reading a json string of events and binding that to a list (using the list app starting point)
public void Load()
{
// form the URI
UriBuilder uri = new UriBuilder("http://mysite.com/events.json");
WebClient proxy = new WebClient();
proxy.OpenReadCompleted += new OpenReadCompletedEventHandler(OnReadCompleted);
proxy.OpenReadAsync(uri.Uri);
}
void OnReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
if (e.Error == null)
{
var serializer = new DataContractJsonSerializer(typeof(EventList));
var events = (EventList)serializer.ReadObject(e.Result);
foreach (var ev in events)
{
Items.Add(ev);
}
}
}
public ObservableCollection<EventDetails> Items { get; private set; }
EventDetails is my class that wraps the json string. this class has to be correct because it is an exact copy of the class used by that website internally from which the json is generated...
I get the json string correctly from the webclient call (I read the memorystream and the json is indeed there) but as soon as I attempt to deserialize the string, the application exits and the debugger stops.
I get no error message or any indication that anything happen, it just stops. This happens if I type the deserialize method into the watch window as well...
I have already tried using JSON.net in fact I thought maybe it was a problem with JSON.net so I converted it to use the native deserializer in the .net framework but the error is the same either way.
why would the application just quit? shouldn't it give me SOME kind of error message?
what could I be doing wrong?
many thanks!
Firstly, the fact that you have some string there that looks like JSON does not mean that you have a valid JSON. Try converting a simple one.
If your JSON is valid, it might be that your JSON implementation does not know how to convert a list to EventList. Give it a try with ArrayList instead and let me know.
The application closes because an unhandled exception happens. If check the App.xaml.cs file you will find the code that closes your app. What you need to do is try catch your deserialization process and handle it locally. So most likely you have some JSON the DataContractJsonSerializer does not like. I have been having issue with it deserializing WCF JSON and have had to go other routes.
You may want to check to ensure your JSON is valid, just because your website likes it does not mean it is actually valid, the code on your site may be helping to correct the issue. Drop a copy of your JSON object (the string) in http://jsonlint.com/ to see if it is valid or not. Crokford (the guy who created JSON) wrote this site to validate JSON, so I would rely on it more than your site ;) This little site has really helped me out of some issues over the past year.
I ran into this same kind of problem when trying to migrate some existing WM code to run on WP7. I believe that the WP7 app crashes whenever it loads an assembly (or class?) that references something that's not available in WP7. In my case, I think it was Assembly.Load or something in the System.IO namespace, related to file access via paths.
While your case might be something completely different, the symptoms were exactly the same.
The only thing I can recommend is to go through the JSON library and see if it's referencing base classes that are not allowed in WP7. Note that it doesn't even have to hit the line of code that's causing the issue - it'll crash as soon as it tries to hit the class that contains the bad reference.
If you can step into the JSON library, you can get a better idea of which class is causing the problem, because as soon as the code references it, the whole app will crash and the debugger will stop.
I am trying to prototype a Rpc Call to a JBOSS webserver from Silverlight (4). I have written the code and it is working in a console application - so I know that Jboss is responding to the web request. Porting it to silverlight 4, is causing issues:
let uri = new Uri(queryUrl)
// this is the line that hangs
let request : HttpWebRequest = downcast WebRequest.Create(uri)
request.Method <- httpMethod;
request.ContentType <- contentType
It may be a sandbox issue, as my silverlight is being served off of my file system and the Uri is a reference to the localhost - though I am not even getting an exception. Thoughts?
Thx
UPDATE 1
I created a new project and ported my code over and now it is working; something must be unstable w/ regard to the F# Silverlight integration still. Still would appreciate thoughts on debugging the "hanging" web create in the old model...
UPDATE 2
let uri = Uri("http://localhost./portal/main?isSecure=IbongAdarnaNiFranciscoBalagtas")
// this WebRequest.Create works fine
let req : HttpWebRequest = downcast WebRequest.Create(uri)
let Login = async {
let uri = new Uri("http://localhost/portal/main?isSecure=IbongAdarnaNiFranciscoBalagtas")
// code hangs on this WebRequest.Create
let request : HttpWebRequest = downcast WebRequest.Create(uri)
return request
}
Login |> Async.RunSynchronously
I must be missing something; the Async block works fine in the console app - is it not allowed in the Silverlight App?
(Thanks for sending this to fsbugs, to force us to take a hard look.)
The problem is Async.RunSynchronously. When called on the UI thread, this blocks the UI thread. And it turns out that WebRequest.Create() on Silverlight dispatches to the UI thread. So it is a deadlock.
In general, try to avoid Async.RunSynchronously on Silverlight (or on any UI thread). You can use Async.StartImmediate in this example. Alternatively, I think you can call RunSynchronously from any background thread without issues. (I have not tried enough end-to-end Silverlight scenarios myself to offer more advice as yet. You might check out
Game programming in F# (with Silverlight and WPF)
F# and Silverlight
F# async on the client side
for a few short examples.)
(In retrospect, the F# design team thinks that we maybe should not have included Async.RunSynchronously in FSharp.Core for Silverlight; the method potentially violates the spirit of the platform (no blocking calls). It's possible we'll deprecate that method in future Silverlight releases. On the other hand, it still does have valid uses for CPU-intensive parallelism on Silverlight, e.g. running a bunch on (non-IO) code in parallel on background threads.)
Seems like a similar issue here - though no reference to silverlight (in fact it is a "windows service class"):
http://social.msdn.microsoft.com/Forums/en-US/netfxnetcom/thread/10854fc4-2149-41e2-b315-c533586bb65d
I had similar problem. I was making a Silverlight MVVM ViewModel to bind data from web.
Don Syme commented himself:
I’m not a data-binding expert, but I
believe you can’t “hide” the asyncness
of a view model like this for WPF and
Silverlight. I think you would need to
expose Task, Async or an
observable collection. AFAIK the only
way to get Silverlight and WPF to bind
asynchronously to a property is if it
is an observable collection.
Anyway, I installed F# Power Pack to get AsyncReadToEnd.
It didn't solve the case... I added domains to trusted sites but it didn't help... Then I added a MySolution.Web -asp.net-site and clientaccesspolicy.xml. I don't know if those had any effect.
Now, with Async.StartImmediate I got web service call working:
let mutable callresult = ""
//let event = new Event<string>()
//let eventvalue = event.Publish
let internal fetch (url : Uri) trigger =
let req = WebRequest.CreateHttp url
//req.CookieContainer <- new CookieContainer()
let asynccall =
async{
try
let! res = req.AsyncGetResponse()
use stream = res.GetResponseStream()
use reader = new StreamReader(stream)
let! txt = reader.AsyncReadToEnd()
//event.Trigger(txt)
callresult <- txt //I had some processing here...
trigger "" |> ignore
with
| :? System.Exception as ex ->
failwith(ex.ToString()) //just for debug
}
asynccall |> Async.StartImmediate
Now I will need my ViewModel to listen the mutable callresult.
In your case you need also a crossdomain.xml to the server.
The trigger is needed to use the UI-thread:
let trigger _ =
let update _ = x.myViewModelProperty <- callresult
System.Windows.Deployment.Current.Dispatcher.BeginInvoke(new Action(update)) |> ignore
fetch serviceUrl trigger
I think you are hitting the maximum http connections restriction: see Aynchronous web server calls in Silverlight and maximum HTTP connections and http://weblogs.asp.net/mschwarz/archive/2008/07/21/internet-explorer-8-and-maximum-concurrent-connections.aspx