Writing for others but also just for myself. Sharing (not always) the bright side of technology. Hoping to bring some joy or to save some sweat.
About myself: Software Engineer at Facebook. A former dev on the Alexa Communications team at Amazon. Used to work at Microsoft on SignalR, EntityFramework, WCF Data Services and managed Xml. Continuously impressed by people.
Pawel Kadluczka
Code, the Universe and everything... 
Might I ask you to look at my question on StackOverflow?
MVC EF Insert bitmap into table
You answered a similar question and mentioned a bytemap array but did not provide any code. I think I need to use memorystream, but I’m too much of a beginner in EF to to implement the concept.
Thanks JW
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I responded to your question on StackOverflow.
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I don’t follow too many bloggers, but I’m finding your interests interesting.. That’s a nice association of developer changing, development projects you have going there.. I’m going to have to look into SignalR a bit more.. my impression was it was kind of a branding to websockets and leveraged legacy support for incompatible devices .. but my impression of EntityFramework wasn’t entirely accurate, so there’s probably more going on there then I know.. looking forward to reviewing your past and latest articles over the coming week(s)..
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Thanks for the kind words. Seems like your preception of SignalR is not entirely accurate but if you play with it a little bit you should get on track pretty quickly 😉
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do you have a simple example of your signalR client receiving a broadcast from the server? there isn’t much documentation at https://github.com/aspnet/SignalR-Client-Cpp/ and I haven’t been able to find much online. The test classes seem to use hard-coded responses instead of connecting to a live server
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For persistent connection (the connection class) use the message_received callback. For hubs API (the hub_comnection class) create a hub_proxy for your hub and use the on callback. I am going to write a blog post about the SignalR native client soon. Stay tuned.
Pawel
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Mr pawel ,i have a problem in visual studio 2013, exactly like http://stackoverflow.com/questions/19791278/error-when-generating-database-from-model-in-visual-studio-2013 , and i think that you can help me (i hope you do that ) please help me if you can 🙂 thanks : saman9452@gmail.com
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This SO thread http://stackoverflow.com/questions/19867641/entity-framework-in-visual-studio-2013-library-not-found/19912856#19912856 contains an explanation and solution to this problem.
Thanks,
Pawel
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thanks for your fast answer 🙂 i read this before and it wasn’t helpful ,the value of VS120COMNTOOLS in my system is” C:\Program Files\Microsoft Visual Studio 12.0\Common7\Tools\”) (i mean it’s true). i don’t know is it important that my system is 32 bit not 64 ?? so thanks again 🙂
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If you can see the file when you do:
dir "%VS120COMNTOOLS%"..\IDE\Extensions\Microsoft\"Entity Framework Tools\DbGen\SSDLToSql10.tt"from the Developer Command Prompt from VS2013 then it is a different issue in which case you should create a new question on stackoverflow and provide all the details.
Thanks,
Pawel
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Hello, can you write a short blog post on how to use the EF 6.0 level 2 cache in a web forms project that uses Ef 6.0 database first ?
thank you
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Have you tried registering 2nd level cache the same way I showed in this post: https://blog.3d-logic.com/2014/03/20/second-level-cache-for-ef-6-1/ ? I have not tried it with database first but I think it should just work. Try it out and if it does not work let me know what breaks.
Thanks,
Pawel
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Hi, I am really interested in DNX .NET, the github repo is huge. What is a good place to start learning the code? I just need a few pointers to get going, Thanks!
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Honestly, I don’t think you are really interested in DNX per se. What’t in the DNX repo is infrastructure for running ASP.NET v5 applications. To get started I would recommend watching https://channel9.msdn.com/Events/Build/2015/2-726 and https://channel9.msdn.com/Events/Build/2015/2-687. Then I would try building a simple command line and, then, an ASP.NET application. If I am mistaken and you are really interested in DNX create a simple command line application, start it from command line using the
--debugoption (i.e.dnx --debug . run) attach a debugger (note you will need VS 2015 and also if you want to see the full stack (i.e. native and managed frames) you would need to select native and .NET code type when attaching to the process) and inspect the stack. Next do the same but set a breakpoint in the dnx.cpp and debug all the way up to your app. As I said, I don’t think this is what you are really interested in because you don’t really need to know how we start CLR or CoreCLR to successfully write ASP.NET 5 apps.Thanks,
Pawel
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Hello! Do you interested in writing a review for Nextion TFT HMI Display
(http://wiki.iteadstudio.com/Nextion_HMI_Solution)? If you do, I can send you samples. Contact me if you are interested.
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Hi Elsie,
Thanks for contacting me. I would like to know what your expectations are. I typically don’t do reviews but rather I do tutorials showing how to use the given component/circuit board. I quickly look at the display you offer and I think it would be interesting to make it work on Windows 10 IoT (Raspberry Pi2) – if it is possible at all.
Thanks,
Pawel
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Hi Pawel,
Is there a way of scaling SignalR by using Service Bus for Windows Server (https://msdn.microsoft.com/en-us/library/dn659461.aspx) as a backbone?
Regards,
Dmitry
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There is not one from Microsoft. Maybe there is a 3rd party but I am not aware it.
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Hi Pawel,
Thanks for your blog posts on Signalr Core topic. They’re quiet interesting and helpful.
Are you planning to continue the series with new updates?
Regards,
Hovhannes.
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Hi Hovhannes,
I am glad you like the series. I am planning to write at least one more post but am waiting for the things to get a little bit more stable.
Thanks,
Pawel
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Hi Pawel,
it has already implemented a JAVA client (Android) for the ASPNET Core SignalR?
Regards,
Diogo Pio
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Hi Diogo Pio,
We don’t have the Java client for ASP.NET Core SignalR at this moment. We are planning to write one though – stay tuned.
Thanks,
Pawel
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Hey Moozzyk; Can you help me out here? I downloaded Rebecca AIML-11tp3.exe from SorceForge.net in hope to learn the program. After the install on Windows 7 Ultimate 64-bit I opened the Folder. I started to read the “User’s Guide” and was going to try an example. I looked in all of Rebecca’s folders, and I can not find 1 Application except for “Uninstall”. How do I Open RebeccaAIML..?The Install was successful. Thanks in advance, James.
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I don’t think I tried to/was able to make it work. I took all the code updated for VS2015 (or VS2013 – it’s been a while so don’t remember) and put it in my repo: https://github.com/moozzyk/Rebecca. If you open the .sln file you should be able to build it with VS and step through the code.
Thanks,
Pawel
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Can you show me a example of a real implementation of SignalR AspNetCore HubContext in a separeted class ?
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Are you asking about injecting `IHubContext` into a class (e.g. a Controller)? If so, you can find an example here: https://github.com/aspnet/SignalR/issues/182#issuecomment-278421834. If this is not what you are asking you need to elaborate on “implementation of (…) HubContext in a separate class” because I don’t quite get what you mean.
Thanks,
Pawel
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I have my Hub, and want to call this HubContext inside another class
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As in the example I provided a link to you can inject the hub context to your class. If you create your instance manually you will need to either inject IHubContext to this class or you can inject IServiceProvider, resolve IHubContext manually and pass it to the ctor.
Thanks,
Pawel
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Hey how would I get the the client file to work without using node?
I tried using a raw copy of the file:
https://rawgit.com/wpitallo/scripts/master/signalr-client-1.0.0-alpha2-final.js
But when it runs it does not resolve the HubConnection
I have created an example here:
Thanks for the help,
Regards Warren
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I assume “without using node” means on a web page. Did you include the client file using ? Using the client with the browser is described here: https://blog.3d-logic.com/2017/09/18/the-signalr-for-asp-net-core-javascript-client-part-1-web-applications/ and here is an example: https://github.com/moozzyk/SignalRChat/blob/7fe50ebc4acf67e3abbafd25dd20f1a4af458906/SignalRChat/wwwroot/index.html
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Hello there.Can you Write Sample for angular2+ and SignnalR Core?when is Final Relase of SIgnalR Core?i cant wait…
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Have you seen Damien’s post on using SignalR and Angular: https://damienbod.com/2017/09/12/getting-started-with-signalr-using-asp-net-core-and-angular/? I think this should get you started. As per the roadmap here: https://github.com/aspnet/Home/wiki/Roadmap SignalR is going to be included in Asp.NET Core 2.1.0 which is expected in Q1-Q2 2018.
Thanks,
Pawel
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Hi Sir ,
Can you help me to find out how to send a file in real time chat using signal?
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I would recommend using a different channel for sending files – e.g. upload file using HTTP and let the other user download it (again using HTTP). SignalR is not really well suited for sending files – the non-ASP.NET Core version does not support binary formats at all so you would have to base64-encode the files to be sent making payloads much bigger than needed. On top of that with that version the files would be stored on the server side in memory and, if you are scaling out, sent to all the servers in the farm. The ASP.NET Core version of SignalR supports binary formats (MessagePack based binary protocol is built-in) but not all the transports support it.
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Hi Pawel,
I’ve been using your Swift SignalR Library for iOS and it’s great! I have been building an app that uses it extensively and I was wondering what your plans were for the future of the library and whether you will continuing developing it.
Thanks
Jordan
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Hi Jordan,
I am glad that the Swift SignalR client works for you. I intend to develop and maintain it (btw. I posted the 0.3 version to Cocoapods last weekend).
Thanks,
Pawel
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Awesome! Great to hear!
Thank you,
Jordan
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Hi ,
i am pretty new to EF. i am getting an error like The mapping and metadata information for EntityContainer ‘x’ no longer matches the information used to create the pre-generated views after updating the Model. i am trying to identify the issue and resolve it for more than a week. still i do not have any idea. could you please help me to understand it and resolve it.
It means a lot to me if the issue gets fixed. thanks in advance.
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If you get a mismatch you can try deleting the old artifact (delete the file or drop the table) and it will be re-generated. A better solution would be to validate if you really need to use this project. My gut feeling is that if you have fewer than 100 tables in your database you probably are not getting any noticeable difference. If you have more you still may not see any noticeable difference. Measure your startup time without the library and if it is acceptable remove the dependency and simplify your code.
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I’ve really enjoyed your C64 Signal R project and have it working on a C64 but at 1200 baud. This does occasionally have issues like you discussed but when switching the baud to 600 it will not connect to the Signal R server. Can you help me understand the specific changes that need to be made when changing baud rates. Thanks again for such a great project.
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It’s great to hear you were able to make it work. Honestly, after I wrote down the steps to reproduce the project I had doubts anyone would be able to build this on their own.
Regarding the problem you are facing – there are two places you need to change to lower the transmission rate. One is in the ESP project and one is in the assembly code. Here is a diff that does that: https://github.com/moozzyk/SignalR-C64/commit/c70d8963679e0c7dd17430417d0c4d71afbf4407. You can skip the Python files – they’re just debugging tools.
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That worked! I was just missing the change in the rs232 file. Thank you!
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Glad to hear it now works!
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