I was looking out for a sample WebSocket implementation on DartPad.
Here's a link to the implementation: WebSocket Sample
However, while trying to implement the same on my local machine, I encountered that Dart has two implementations of the WebSocket class.
One is provided in the dart:io package and another is provided in dart:html package.
Can anyone provide what's the difference between the two and what are the advantages of one over the other?
The one in dart:io is used for standalone app running on Dart VM including Flutter, while the one in dart:html is for Web browsers.
There is no major difference other than some implementation changes in both libraries:
WS in dart:io: https://api.dart.dev/stable/2.7.0/dart-io/WebSocket-class.html
WS in dart:html: https://api.dart.dev/stable/2.7.0/dart-html/WebSocket-class.html#constructors
if you see closely both the classes have the same approach in everything except creating a web socket instance.
dart:io :
Simple no arg constructor is deprecated. But has a factory method to create an instance using a Socket.
dart:html :
Websocket constructor takes a url string and a list of protocol objects.
Related
I'm using Dart, and i want to implements swagger-ui, as a web on my proyect.
I have the json/yaml file of my API and that API running on local.
The JS+Css+Html Option of swagger-ui works fine, but, is there a way to generate a web like this in Dart?
I guess I am confused what you want to do.
Dart has it's own documentation generator, dartdoc, that works out of the box for any package. I don't know of any support for swagger or if it offers any particular advantages for Dart users.
An example for args package:
https://www.dartdocs.org/documentation/args/0.13.7/index.html
Are there free WebSocket client implementations for Delphi? I found only this one:
WebSockets Delphi Components
but it is not free.
Here is my open source library:
https://github.com/andremussche/DelphiWebsockets
I've added support for WebSockets to xxm. Not all handlers support the required IXxmRawSocket interface, but the Apache httpd module (xxmAHttpd) and the SCGI handler do, and I still get the best results with the standalone 'raw' handler xxmHttp. See more here.
How to create client server application in dart.
My aim is to create a program to extract parameters form URL and store them in session on variable and connect the dart to .net web service and in below code i shows
The built-in library 'dart:io' is not available on Dartium.
import 'dart:core';
import 'dart:io';// import the dart:io library
main() {
HttpServer server; // create the server
server.listen("127.0.0.1", 8080); // and start listening
}
When I understand your question correctly, the server part of your client server application is a .NET web service. So you try to write the client side in Dart (the part that runs in the browser)?
You don't need to import dart.core.
If you want to run an app in the browser you must not import dart:io. dart:io is for Dart applications that run locally like commands you execute on the command line or launch using an icon on your desktop or that run as a background service.
In Browser applications you normally import dart:html instead. dart:html doesn't provide a lot of functionality that dart:io has. This is because the browser doesn't allow for example to access the local file system due to security reasons. Imagine you browse to a website and the code in this website could read, delete or upload to any server any file on your computer ...
When you have imported dart:html you can use the class HttpRequest to connect to the server.
Did you develop the .NET web service yourself?
You can easily access web services that provide a REST or JSON API.
I don't know how to access .NET SOAP webservice with Dart though?
You can find basic instructions how to make a request to the server here https://www.dartlang.org/articles/json-web-service/
Assumed that I code some type of library and convert it to js (per dart2js). How can I access the prototypes to create objects? What is right way to resolve dart-namespaces?
You can expose functions to JavaScript
Expose Dart functions to javascript
Dart SDK 0.8.10.3_r29803 dart:js callbacks
Using Dart with JSON Web Services (it's used for JSONP)
see also js library
I don't think there is a way to expose classes to JavaScript, but I'm not sure about this.
I'm using schema-first web service development approach by hand-coding WSDL/XSD and then feeding it to svcutil tool to generate .NET data and service contracts. I've tried to introduce WS-Addressing into my WSDL by including "UsingAddressing" element both directly into binding and as WS-Policy import. Policy import is ignored, but I get the following error, when "UsingAddress" is included directly into WSDL binding: "WSDL extension element "UsingAddressing" from namespace 'http://www.w3.org/2006/05/addressing/wsdl' was not handled".
According to MSDN, "UsingAddressing" element is supported by WCF (http://msdn.microsoft.com/en-us/library/ms996497.aspx), so is it so, that this element is not supported by svcutil?
For anyone coming across this, I had the same problem trying to generate a proxy with svcutil. I had to generate the proxy via VS2017 and it worked.