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  • Reminder: True WCF Asynchronous Operation

    - by Sean Feldman
    A true asynchronous service operation is not the one that returns void, but the one that is marked as IsOneWay=true. Without this, client will always wait for valid response from server, blocking execution. Possible work-around is to generate asynchronous methods and subscribe to Completed event, but then it’s a pseudo asynchronous. Real fire-and-forget is with one way operations.

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  • Reminder: True WCF Asynchronous Operation

    - by Sean Feldman
    A true asynchronous service operation is not the one that returns void, but the one that is marked as IsOneWay=true using BeginX/EndX asynchronous operations (thanks Krzysztof). To support this sort of fire-and-forget invocation, Windows Communication Foundation offers one-way operations. After the client issues the call, Windows Communication Foundation generates a request message, but no correlated reply message will ever return to the client. As a result, one-way operations can't return values, and any exception thrown on the service side will not make its way to the client. One-way calls do not equate to asynchronous calls. When one-way calls reach the service, they may not be dispatched all at once and may be queued up on the service side to be dispatched one at a time, all according to the service configured concurrency mode behavior and session mode. How many messages (whether one-way or request-reply) the service is willing to queue up is a product of the configured channel and the reliability mode. If the number of queued messages has exceeded the queue's capacity, then the client will block, even when issuing a one-way call. However, once the call is queued, the client is unblocked and can continue executing while the service processes the operation in the background. This usually gives the appearance of asynchronous calls.

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  • wcf web service in post method, object properties are null, although the object is not null

    - by Abdalhadi Kolayb
    i have this problem in post method when i send object parameter to the method, then the object is not null, but all its properties have the default values. here is data module: [DataContract] public class Products { [DataMember(Order = 1)] public int ProdID { get; set; } [DataMember(Order = 2)] public string ProdName { get; set; } [DataMember(Order = 3)] public float PrpdPrice { get; set; } } and here is the interface: [OperationContract] [WebInvoke( Method = "POST", UriTemplate = "AddProduct", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.WrappedRequest, RequestFormat = WebMessageFormat.Json)] string AddProduct([MessageParameter(Name = "prod")]Products prod); public string AddProduct(Products prod) { ProductsList.Add(prod); return "return string"; } here is the json request: Content-type:application/json {"prod":[{"ProdID": 111,"ProdName": "P111","PrpdPrice": 111}]} but in the server the object received: {"prod":[{"ProdID": 0,"ProdName": NULL,"PrpdPrice": 0}]}

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  • How to write a generic service in WCF

    - by rezaxp
    In one of my recent projects I needed a generic service as a facade to handle General activities such as CRUD.Therefor I searched as Many as I could but there was no Idea on generic services so I tried to figure it out by my self.Finally,I found a way :Create a generic contract as below :[ServiceContract] public interface IEntityReadService<TEntity>         where TEntity : EntityBase, new()     {         [OperationContract(Name = "Get")]         TEntity Get(Int64 Id);         [OperationContract(Name = "GetAll")]         List<TEntity> GetAll();         [OperationContract(Name = "GetAllPaged")]         List<TEntity> GetAll(int pageSize, int currentPageIndex, ref int totalRecords);         List<TEntity> GetAll(string whereClause, string orderBy, int pageSize, int currentPageIndex, ref int totalRecords);            }then create your service class :  public class GenericService<TEntity> :IEntityReadService<TEntity> where TEntity : EntityBase, new() {#region Implementation of IEntityReadService<TEntity>         public TEntity Get(long Id)         {             return BusinessController.Get(Id);         }         public List<TEntity> GetAll()         {             try             {                 return BusinessController.GetAll().ToList();             }             catch (Exception ex)             {                                  throw;             }                      }         public List<TEntity> GetAll(int pageSize, int currentPageIndex, ref int totalRecords)         {             return                 BusinessController.GetAll(pageSize, currentPageIndex, ref totalRecords).ToList();         }         public List<TEntity> GetAll(string whereClause, string orderBy, int pageSize, int currentPageIndex, ref int totalRecords)         {             return                 BusinessController.GetAll(pageSize, currentPageIndex, ref totalRecords, whereClause, orderBy).ToList();         }         #endregion} Then, set your EndPoint configuration in this way :<endpoint address="myAddress" binding="basicHttpBinding" bindingConfiguration="myBindingConfiguration1" contract="Contracts.IEntityReadService`1[[Entities.mySampleEntity, Entities]], Service.Contracts" />

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  • Getting a WCF service hosted in IIS 7.0

    - by gregarobinson
     This was not as easy as I thought it would be...lots of errors. These links saved me:  http://blah.winsmarts.com/2008-4-Host_a_WCF_Service_in_IIS_7_-and-amp;_Windows_2008_-_The_right_way.aspx http://blog.donnfelker.com/2007/03/26/iis-7-this-configuration-section-cannot-be-used-at-this-path/   

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  • WCF/webservice architecture question

    - by M.R.
    I have a requirement to create a webservice to expose certain items from a CMS as a web service, and I need some suggestions - the structure of the items is as such: item - field 1 - field 2 - field 3 - field 4 So, one would think that the class for this will be: public class MyItem { public string ItemName { get; set; } public List<MyField> Fields { get; set; } } public class MyField { public string FieldName { get; set; } public string FieldValue { get; set; } //they are always string (except - see below) } This works for when its always one level deep, but sometimes, one of the fields is actually a point to ANOTHER item (MyItem) or multiple MyItem (List<MyItem>), so I thought I would change the structure of MyField as follows, to make FieldValue as object; public class MyField { public string FieldName { get; set; } public object FieldValue { get; set; } //changed to object } So, now, I can put whatever I want in there. This is great in theory, but how will clients consume this? I suspect that when users make a reference to this web service, they won't know which object is being returned in that field? This seems like a not-so-good design. Is there a better approach to this?

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  • Http 400 'Bad Request' and win32status 1450 when larger messages are sended to a WCF service

    - by Tim Mahy
    Hi all, we sometimes receive Http 400 bad request resultcodes when posting a large file (10mb) to a WCF service hosted in IIS 6. We can reproduce this using SOAP UI and it seems that it is unpredictable when this happens. In our WCF log the call is not received, so we believe that the request does not reach the ASP.NET nor WCF runtime. This happens on multiple websites on the same machine each having their own application pool. All IIS settings are default, only in ASP.NET and WCF we allow bigger readerQuota's etc.... The win32status that is logged in the IIS log is 1450 which we think means "error no system resources". So now the question: a) how can we solve this b) (when a is not applicable :) ) which performance counters or logs are usefull to learn more about this problem? greetings, Tim

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  • Http 400 'Bad Request' and win32status 1450 when larger messages are sended to a WCF service

    - by Tim Mahy
    we sometimes receive Http 400 bad request resultcodes when posting a large file (10mb) to a WCF service hosted in IIS 6. We can reproduce this using SOAP UI and it seems that it is unpredictable when this happens. In our WCF log the call is not received, so we believe that the request does not reach the ASP.NET nor WCF runtime. This happens on multiple websites on the same machine each having their own application pool. All IIS settings are default, only in ASP.NET and WCF we allow bigger readerQuota's etc.... The win32status that is logged in the IIS log is 1450 which we think means "error no system resources". So now the question: a) how can we solve this b) (when a is not applicable :) ) which performance counters or logs are usefull to learn more about this problem? greetings, Tim

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  • Stream video from a computer to a tablet

    - by NullOrEmpty
    I would like to watch presentations and college videos I have on my computer, from my tablet. There are almost a hundred of GB in videos, so I would like to watch them in streaming from my computer. My wife has also tons of videos so I have decided to do a kind of streaming local service to watch the videos from our tablets. I have found an article about how to do it with Internet Information Server, but the article is relaying in an application that is not free (Expression Encoder). Since this is for home fun, I am not willing to pay, so I would like to ask for some free encoder that can do the trick. I have no idea about streaming. Actually, I tried to hang the files directly on IIS, and the browser tried first to download some of them and some other (mp4?) got played badly, so I could not get a smooth video experience. What is missing? What is the deal with H.264 ? Can I roll with VC-1 and play videos in my Android tablet with streaming with an acceptable quality through my WLAN home network? Any better solution? Thanks.

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  • WCF vs ASMX web service

    - by shailesh
    I am totally confused between WCF and ASMX web service. I have used lot of web service in earlier stage and now there is new thing introduced WCF. I can still create WCF that function as a web service. I think there will be more stuff in WCF. Can any one provide me any article or difference between WCF and Web service? Which one to use and when?

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  • free video streaming API

    - by rl123
    Hi, I'm trying to build a website that will allow user to upload video files and show them as a streaming video. I'm a complete newbie in the streaming world so I don't know exactly how to do that, and I definitely don't want to reinvent the wheel. Are there any free platforms that I can use for that? Do I need a streaming server, or is there a special kind of player I can use that does not require dedicated server? Thanks!

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  • What are the ways to do synchronized streaming video and text?

    - by Marc
    I would like to have two streams. One being traditional streaming video and another being text. I will also build an interface that allows the user to create the text portion while watching the video. The context of these videos are usually that of an individual being filmed doing a presentation and later the next day for example, a coach will make text annotations (structured data is a plus) with the result being the text stream. It seems this is possible with Silverlight (see the article in the latest MSDN). However, what other methods are there if any? If there any, please give the reasons for why you are recommending them. Thanks. Also, I would prefer something that inst a software as a service hosted solution, but, dont let that keep you from giving an answer. Also keep in mind, the user shouldn't have to do any re-encoding of the video source, the text stream should be separate with someway to synchronize a coach's comments to an arbitrary time stamp in the video.

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  • Intranet Video-streaming

    - by Jonathan Sampson
    What's a good option for home-video-streaming. For example, somebody may use a laptop webcam to stream their baby's crib allowing them to monitor it from the main home PC. In this case, I wouldn't want to do it across the wire with skype, but instead keep it on my local network. What options exist to make this easy to achieve?

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  • Sirius Satellite Radio Streaming via XBOX 360

    - by Kyle B.
    Anyone have any luck with this? I've found a number of articles which point to an application uSirius which is apparently discontinued (bought out by Apple or something it looks like) but it is nowhere I have found. Basically I know media center has some baked in functionality for XM radio streaming, but nothing for Sirius radio. Anyone have any luck with this? Thanks, Kyle

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  • Baseline upload speed for streaming video on demand?

    - by Peter Turner
    Is there a table that shows what is necessary for streaming video on demand? Specifically what I'm trying to do is stream Video on Demand to 50-100 people. I'm flexible with the format, but I'd like text on the screen to be legible (i.e. not 320x240). If someone knows of a calculator or something that would let me figure out exactly how I need to structure my video and ISP that'd be handy too.

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  • VLC or ffserver for http streaming

    - by Maciek Sawicki
    Hi, I don't like asking "OR" questions, but I can't find any comparison on the Internet. I need live http streaming using h264 in flv container. I managed to achieve this with VLC, but with big latency. I have some problems with ffmpeg and I can not make it to work, but I wonder if would it works better then VLC?

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  • Darwin Streaming Server VOD playlist?

    - by StackedCrooked
    I have a large MPEG4 file split up into a number of smaller files. I would like to make these files available as one movie. So I need something like a playlist. It seems the playlist option for live streaming is not available for VOD. Is there a way to get this functionality somehow?

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  • What technologies allow bidirectional streaming of video?

    - by Roman
    Wikipedia says that Flash allows "bidirectional streaming of audio and video". Is it possible to do that with other technologies (for example with JavaScript)? In other words, I want to transfer video from one user of web-site to another one in real time. I want to have something that is already installed by many users or easy to install (Flash fulfills this requirements). And I want to have something free.

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  • Streaming media from a download link

    - by Danny V.
    There often discussions and many facilities available to download streaming media (eg Youtube, Vimeo, etc), however is there a way it can stream a download link? Currently, my internet connection is prohibitively slow to download a video and I would prefer if I could watch the video while it is still downloading but I couldn't find how to do this. I did find this article but it appears to need your own media server.

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