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  • Socket : can an asynchronous Receive returns without reading all the bytes I asked for?

    - by NorthWind
    Hi; I was reading an article on Vadym Stetsiak's blog about how to transfer variable length messages with async sockets (url: http://vadmyst.blogspot.com/2008/03/part-2-how-to-transfer-fixed-sized-data.html). He says : What to expect when multiple messages arrive at the server? While dealing with multiple messages one has to remember that receive operation can return arbitrary number of bytes being read from the net. Typically that size is from 0 to specified buffer length in the Receive or BeginReceive methods. So, even if I tell BeginReceive to read 100 bytes, it may read less than that and returns??? I am developing a network-enabled software (TCP/IP), and I always receive the same exact number of bytes I asked for. I don't even understand the logic : why would Receive completes asynchronously if it didn't get every byte I asked for ... just keep waiting. Maybe it has something to do with IP vs TCP? Thank you for your help.

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  • How do I make calls to a WCF service with jquery ajax from an SSL-secured page?

    - by NovaJoe
    I have a WCF service returning JSON to jQuery ajax calls and presenting the results on an ASPX page. When the page is NOT under SSL, the ajax calls work perfectly. When the page IS under SSL, the calls fail. I understand that this behavior must be due to the Same Origin Policy (SOP). So, how do I setup my WCF service to accept calls from an SSL-secured page? Does the WCF service also need to be secured? If so, how do I do this? Thanks, Joe

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  • ajax with WCF work. but few miniute after, doesn't work.

    - by sunglim
    hello. I am WCF pure newbie. I know this question could look like dumb. I used to write ajax with the Webservice. but on this project. I tried to use WCF for ajax. after I build the project. I try to call wcf ajax. and I can receive return successfully. But 10 or more minute after. I cann't receive return, and the ajax call the error function. and the fiddler return nothing. if I rebuild the project without any source modifying, I can receive ajax return successfully. such a weird situation. is their anybody who experience this? and know why ? Thank You.

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  • Create a new delegate class for each asynchronous image download?

    - by Charles S.
    First, I'm using an NSURLConnection to download JSON data from twitter. Then, I'm using a second NSURLConnection to download corresponding user avatar images (the urls to the images are parsed from the first data download). For the first data connection, I have my TwitterViewController set as the NSURLConnection delegate. I've created a separate class (ImageDownloadDelegate) to function as the delegate for a second NSURLConnection that handles the images. After the tweets are finished downloading, I'm using this code to get the avatars: for(int j=0; j<[self.tweets count]; j++){ ImageDownloadDelegate *imgDelegate = [[ImageDownloadDelegate alloc] init]; Tweet *myTweet = [self.tweets objectAtIndex:j]; imgDelegate.tweet = myTweet; imgDelegate.table = timeline; NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:myTweet.imageURL] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60]; imgConnection = [[NSURLConnection alloc] initWithRequest:request delegate:imgDelegate]; [imgDelegate release]; } So basically a new instance of the delegate class is created for each image that needs to be downloaded. Is this the best way to go about this? But then there's no way to figure out which image is associate with which tweet, correct? The algorithm works fine... I'm just wondering if I'm going about it the most efficient way.

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  • How to debug a WCF Service with an HTTP Context?

    - by JL
    I need to debug a WCF service but it needs to have an HTTP Context. Currently I have a solution with a WCF service web site, when I click on debug it starts up and then fires up an html page that contains no test form. While the project is running I tried starting the wcftestclient manually, then provided the address of my service, it finds the service but when I invoke it, it bypasses the IIS layer (or development server), so the httpContext is null... What is the correct way to debug a WCF service through an IIS context?

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  • JavaScript: How can I delay running some JS code until ALL of my asynchronous JS files downloaded?

    - by Henryh
    UPDATE: I have the following code: <script type="text/javascript"> function addScript(url) { var script = document.createElement('script'); script.src = url; document.getElementsByTagName('head')[0].appendChild(script); } addScript('http://example.com/One.js'); addScript('http://example.com/Two.js'); addScript('http://example.com/Three.js'); addScript('http://example.com/Four.js'); ... // run code below this point once both Two.js & Three.js has been downloaded and excuted </script> How can I prevent code from executing until all required JS have been downloaded and executed? In my example above, those required files being Two.js and Three.js.

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  • WCF Rest services for use with the repository pattern?

    - by mark smith
    Hi there, I am considering moving my Service Layer and my data layer (repository pattern) to a WCF Rest service. So basically i would have my software installed locally (WPF client) which would call the Service Layer that exists via a Rest Service... The service layer would then call my data layer using a WCF Rest Service also OR maybe just call it via the DLL assembly I was hoping to understand what the performance would be like. Currently I have my datalayer and servicelayer installed locally via DLL Assemblies locally on the pc. Also i presume the WCF REST services won't support method overloading hance the same name but with a different signature?? I would really appreciate any feedback anyone can give. Thanks

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  • Postgres : Post statement (or insert) asynchronous, non-blocking processing.

    - by Hassan Syed
    I'm wondering if it is possible, that after a collection of rows is inserted, to initiate an operation that is executed asynchronously, is non-blocking, and doesn't need to inform the originator of the request - of the result. I am working with large amounts of events and I can guarantee that the post-insert logic will not fail -- I just want to have a single insert thread in my event-sources, and I want this thread to keep flying without blocking, and without being responsible for any post-delivery book-keeping. I can tell you that I would potentially have a 100 of these jobs executing concurrently and each job might operate on 5 tables with anywhere between 200-1000 inserts on each of these tables. A hint in the right direction should be enough.

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  • How do I implement SAML 2.0 in a WCF Client?

    - by Tone
    I need to implement SAML 2.0 for a WCF client that is talking to a java web service (Glassfish). I know very little about SAML, and after a bit of searching here (and elsewhere) I do not find much about how to implement with WCF. Since WCF abstracts you away from the SOAP layer how can I add SAML assertions to the SOAP header? Will a 3rd party tool like ComponentSpace work best? Or should I roll my own? Other advice?

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  • What is a good practice for handling SQL connections within a WCF call?

    - by Rising Star
    Suppose I want to create a (stateless) WCF service with three methods exposed on an endpoint: performSqlOperationA(), performSqlOperationB(), and performSqlOperationC(). Each method inserts data into a SQL database. The way I've seen things done at my office, each method would begin with code to initialize a SqlConnection object. Each method would end with code to safely dispose it. What is a good practice for coding these WCF methods so that the SqlConnection object is initialized and disposed in each method without having to do these things in each method? I know that I can have the connection initialized in the constructor for the class for the WCF methods, but I don't know about disposing it... The calls cannot be wrapped in a using block. One solution I'm familiar with is PostSharp, which allows me to set an attribute which causes specific code to automatically run at the beginning and end of each method call, but it would be greatly preferable to do this with only the .net framework.

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  • Advantages of using WCF to work with Sharepoint Services WSS3.0?

    - by val
    Hi folks, what is your opinion or better off your practical experience using WCF to work with WSS instead of SP web services? I am writing some custom library for our software to store and retrieve files from WSS document libraries using sharepoint web services. I am not entirely happy with the performance of the sp web services - a bit too slow in many cases. Now, microsoft claims a significant improvements in WCF over remoting and I am looking into a good way to use WCF for my file services. Any suggestions or ideas? Maybe a good source of coding practices or blogs? Thanks a lot, Val

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  • can I debug my web proejct and wcf project on same vs 2008 instance ?

    - by dotnetcoder
    I have two projects in my solution 1- asp.net web project. 2- wcf serivce project. 3- other common projects between two listed above Currently on the local dev machine I have to run two visual studio instance to run both projects in debug mode. That makes the system run out of resources as these projects share some other project in the soultion which are heavy in files. Is there a way I can hookup the wcf project on a sinlge visual stodio instance that I am using to debug the asp.net web applicaiton. I do not want to combine the web and wcf project in to one. Have already considred this option. thanks for sharing your thoughts in advance.

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  • 505 (HTTP version not supported) sent to client when ASP.NET application attempts to access WCF service

    - by Aaron J Spetner
    We have created a DLL to facilitate access of a 3rd-party WCF Service. This DLL works fine in a Windows Application on our test machines, but when we try to use it in an ASP.NET application on our web server, our web server returns a 505 HTTP version not supported error to the client. To clarify, the setup is Client-Server-WCF Service. Using Fiddler, I can tell that our server is not making requests to the WCF Service. The calls are wrapped in a try/catch block, but no Exception occurs. Instead, as soon as the call to the service is attempted, our server returns a 505 error to the client and terminates execution. We are using clientCertificate authentication over HTTPS with serviceCertificate certificateValidationMode set to "None". Thanks

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  • Javascript inheritance: call super-constructor or use prototype chain?

    - by Jeremy S.
    Hi folks, quite recently I read about javascript call usage in MDC https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/call one linke of the example shown below, I still don't understand. Why are they using inheritance here like this Prod_dept.prototype = new Product(); is this necessary? Because there is a call to the super-constructor in Prod_dept() anyway, like this Product.call is this just out of common behaviour? When is it better to use call for the super-constructor or use the prototype chain? function Product(name, value){ this.name = name; if(value >= 1000) this.value = 999; else this.value = value; } function Prod_dept(name, value, dept){ this.dept = dept; Product.call(this, name, value); } Prod_dept.prototype = new Product(); // since 5 is less than 1000, value is set cheese = new Prod_dept("feta", 5, "food"); // since 5000 is above 1000, value will be 999 car = new Prod_dept("honda", 5000, "auto"); Thanks for making things clearer

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  • can I debug my web project and wcf project on same vs 2008 instance ?

    - by dotnetcoder
    I have two projects in my solution   1- asp.net web project.   2- wcf serivce project.   3- other common projects between two listed above Current on the local dev machine I have to run two visual studio instance to run both projects in debug mode. That makes the system run out of resources as these projects share some other project in the soultion which are heavy in files. Is there a way i can hookup the wcf project on a sinlge visual stodio instance and also be able to debug my asp.net web project. ? I do not want to combine the web and wcf project in to one. Have already considred this option. thanks for sharing your thoughts in advance.

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  • WCF RIA Services feedback

      If you use or plan to use WCF RIA Services, here is your chance to shape the future of this product, vote or propose features for vNext in this page: http://dotnet.uservoice.com/forums/57026-wcf-ria-services You can find help and ask questions on the current release of RIA Services on the official forum: http://forums.silverlight.net/forums/53.aspx ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Easy remote communication without WCF

    - by Ralf Westphal
    If you´ve read my previous posts about why I deem WCF more of a problem than a solution and how I think we should switch to asynchronous only communication in distributed application, you might be wondering, how this could be done in an easy way. Since a truely simple example to get started with WCF still is drawing quite some traffic to this blog, let me pick up on that and show you, how to accomplish the same but much easier with an async communication API. For simplicities sake let me put all...(read more)

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  • Do not expose enum in WCF response

    - by Michael Freidgeim
    We had a backward compatibility problem in WCF client, when in Service application a new value was added to one of enums. We discussed different ways to avoid this backward compatibility issues, and I found recommendation do not expose enum in wcf response in http://stackoverflow.com/a/788281/52277.It is still required to create new versions of our service interfaces to replace each enum fields with string field, that expects only documented values, and describe, what should be default behavior, if field has an unexpected value.

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  • Implement service layer in MVC

    - by Dan H
    We have a defined service layer hosted in WCF. We are now building a website that will need to use the services functionality. The website is being written in ASP.NET MVC 4 and I'm trying to decide how to reference the WCF service from the MVC app. It's a large complex website and it will be changing on a weekly basis. My first reaction is to abstract out the service references (About 7 services on this one WCF host) and create a service ref facade library with which the website interacts. But, I don't know exactly how to use the service facade in MVC. I'm starting to think the Models will be responsible for it because when the controller gets a model, that model should call the service (if needed) and return what the controller asked. I'm trying to avoid having the MVC app know details of the service references. So, I could have a model factory that creates whatever model the controllers need and they can use the service facade to accomplish it. Is this a good plan, or am I off track?

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  • Design pattern for client/server sessions?

    - by nonot1
    Are there any common patterns or general guidance I can learn from for how to design a client/server system where the both the client and server must maintain some kind per-client session state? I've found any number of libraries that can help with some of the plumbing, but it's the overall design I'm wondering about. Open issues in my mind: How to structure the client/server communication so that bidirectional synchronous and asynchronous requests are possible? The server side needs to spawn a couple of per-connected-client session-long helper process. How to manage that? How to manage the mapping from a given client (and any of it's requests) to server state and helper process instances in the face of multiple clients and intermittent network connectivity. Most communication can be simple blocking request/reply, but some will be long running processing tasks that the client will want to keep tabs on. To the extent that it matters, the platform is Linux/C/C++. Not web based. Just an existing thick-client software app being modified to talk to backend servers for some tasks.

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  • END_TAG exception while calling WCF WebService from Android using KSOAP2?

    - by sunil
    Hi, I am trying to call a WCF Web Service from Android using KSOAP2 library. But I am getting this END_TAG exception. I have followed this thread to call WCF Web Service but still no result. I am passing "urn:TestingWcf/GetNames" as SOAP_ACTION, does this causes problem in Android since the error occurs at the statement "aht.call(SOAP_ACTION, envelope)" where aht is AndroidHttpTransport class object. Can someone let me know what the problem may be? import org.ksoap2.*; import org.ksoap2.serialization.*; import org.ksoap2.transport.*; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class Ksoap2Test extends Activity { private static final String METHOD_NAME = "GetNamesJsonWithParam" private static final String NAMESPACE = "http://tempuri.org/"; private static final String URL = "http://192.168.3.61/BattleEmpire.Service/TestingWcf.svc/basic"; final String SOAP_ACTION = "urn:TestingWcf/GetNamesJsonWithParam"; TextView tv; StringBuilder sb; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); tv = new TextView(this); sb = new StringBuilder(); call(); tv.setText(sb.toString()); setContentView(tv); } public void call() { try { SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); request.addProperty("imran", "Qing"); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); envelope.dotNet = true; envelope.setOutputSoapObject(request); System.out.println("Request " + envelope.toString()); //HttpTransportSE androidHttpTransport = new HttpTransportSE(URL); AndroidHttpTransport aht = new AndroidHttpTransport(URL); aht.call(SOAP_ACTION, envelope); //aht.debug = true; /*HttpTransportSE androidHttpTransport = new HttpTransportSE(URL); androidHttpTransport.call(SOAP_ACTION, envelope);*/ SoapPrimitive result = (SoapPrimitive)envelope.getResponse(); //to get the data String resultData = result.toString(); // 0 is the first object of data sb.append(resultData + "\n"); SoapObject resultsRequestSOAP = (SoapObject) envelope.bodyIn; System.out.println(resultsRequestSOAP.toString()); } catch (Exception e) { e.printStackTrace(); sb.append("Error:\n" + e.getMessage() + "\n"); } } } `

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  • Howto WCF Service HTTPS Binding and Endpoint Configuration in IIS with Load Balancer?

    - by Mike G
    We have a WCF service that is being hosted on a set of 12 machines. There is a load balancer that is a gateway to these machines. Now the site is setup as SSL; as in a user accesses it through using an URL with https. I know this much, the URL that addresses the site is https, but none of the servers has a https binding or is setup to require SSL. This leads me to believe that the load balancer handles the https and the connection from the balancer to the servers are unencrypted (this takes place behind the firewall so no biggie there). The problem we're having is that when a Silverlight client tries to access a WCF service it is getting a "Not Found" error. I've set up a test site along with our developer machines and have made sure that the bindings and endpoints in the web.config work with the client. It seems to be the case in the production environment that we get this error. Is there anything wrong with the following web.config? Should we be setting up how https is handled in a different manner? We're at a loss on this currently since I've tried every programmatic solution with endpoints and bindings. None of the solutions I have found deal with a load balancer in the manner we're dealing. Web.config service model info: <system.serviceModel> <behaviors> <serviceBehaviors> <behavior name="TradePMR.OMS.Framework.Services.CRM.CRMServiceBehavior"> <serviceMetadata httpsGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> <behavior name="TradePMR.OMS.Framework.Services.AccountAggregation.AccountAggregationBehavior"> <serviceMetadata httpsGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> </serviceBehaviors> </behaviors> <bindings> <customBinding> <binding name="SecureCRMCustomBinding"> <binaryMessageEncoding /> <httpsTransport /> </binding> <binding name="SecureAACustomBinding"> <binaryMessageEncoding /> <httpsTransport /> </binding> </customBinding> <mexHttpsBinding> <binding name="SecureMex" /> </mexHttpsBinding> </bindings> <serviceHostingEnvironment aspNetCompatibilityEnabled="true" /> <!--Defines the services to be used in the application--> <services> <service behaviorConfiguration="TradePMR.OMS.Framework.Services.CRM.CRMServiceBehavior" name="TradePMR.OMS.Framework.Services.CRM.CRMService"> <endpoint address="" binding="customBinding" bindingConfiguration="SecureCRMCustomBinding" contract="TradePMR.OMS.Framework.Services.CRM.CRMService" name="SecureCRMEndpoint" /> <!--This is required in order to be able to use the "Update Service Reference" in the Silverlight application--> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> </service> <service behaviorConfiguration="TradePMR.OMS.Framework.Services.AccountAggregation.AccountAggregationBehavior" name="TradePMR.OMS.Framework.Services.AccountAggregation.AccountAggregation"> <endpoint address="" binding="customBinding" bindingConfiguration="SecureAACustomBinding" contract="TradePMR.OMS.Framework.Services.AccountAggregation.AccountAggregation" name="SecureAAEndpoint" /> <!--This is required in order to be able to use the "Update Service Reference" in the Silverlight application--> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> </service> </services> </system.serviceModel> </configuration> The ServiceReferences.ClientConfig looks like this: <configuration> <system.serviceModel> <bindings> <customBinding> <binding name="StandardAAEndpoint"> <binaryMessageEncoding /> <httpTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" /> </binding> <binding name="SecureAAEndpoint"> <binaryMessageEncoding /> <httpsTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" /> </binding> <binding name="StandardCRMEndpoint"> <binaryMessageEncoding /> <httpTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" /> </binding> <binding name="SecureCRMEndpoint"> <binaryMessageEncoding /> <httpsTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" /> </binding> </customBinding> </bindings> <client> <endpoint address="https://Service2.svc" binding="customBinding" bindingConfiguration="SecureAAEndpoint" contract="AccountAggregationService.AccountAggregation" name="SecureAAEndpoint" /> <endpoint address="https://Service1.svc" binding="customBinding" bindingConfiguration="SecureCRMEndpoint" contract="CRMService.CRMService" name="SecureCRMEndpoint" /> </client> </system.serviceModel> </configuration> (The addresses are of no consequence since those are dynamically built so that they will point to a dev's machine or to the production server)

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