protocols – Page 11 – Tarik Billa

Cast an instance of a class to a @protocol in Objective-C

December 31, 2022 by Tarik

The correct way to do this is to do: if ([self.myViewController conformsToProtocol:@protocol(MyProtocol)]) { UIViewController <MyProtocol> *vc = (UIViewController <MyProtocol> *) self.myViewController; [vc protocolMethod]; } The UIViewController <MyProtocol> * type-cast translates to “vc is a UIViewController object that conforms to MyProtocol”, whereas using id <MyProtocol> translates to “vc is an object of an unknown class that … Read more

binary protocols v. text protocols

December 23, 2022 by Tarik

Binary protocol versus text protocol isn’t really about how binary blobs are encoded. The difference is really whether the protocol is oriented around data structures or around text strings. Let me give an example: HTTP. HTTP is a text protocol, even though when it sends a jpeg image, it just sends the raw bytes, not … Read more

How do I register a custom URL protocol in Windows?

December 16, 2022 by Tarik

Go to Start then in Find type regedit -> it should open Registry editor Click Right Mouse on HKEY_CLASSES_ROOT then New -> Key In the Key give the lowercase name by which you want urls to be called (in my case it will be testus://sdfsdfsdf) then Click Right Mouse on testus -> then New -> … Read more

How to check if a website has HTTP/2 protocol support

December 1, 2022 by Tarik

You can just check it in: Chrome Dev Tool (F12) → Network → Protocol. It will tell you the protocol used and the domain of each transfer. Legend http/1.1 = HTTP/1.1 h2 = HTTP/2 Note: If you cannot see the Protocol column, just right-click on any header and check the “Protocol” label.

Simple explanation of clojure protocols

November 22, 2022 by Tarik

The purpose of Protocols in Clojure is to solve the Expression Problem in an efficient manner. So, what’s the Expression Problem? It refers to the basic problem of extensibility: our programs manipulate data types using operations. As our programs evolve, we need to extend them with new data types and new operations. And particularly, we … Read more

Difference between TCP and UDP?

November 17, 2022 by Tarik

TCP is a connection oriented stream over an IP network. It guarantees that all sent packets will reach the destination in the correct order. This imply the use of acknowledgement packets sent back to the sender, and automatic retransmission, causing additional delays and a general less efficient transmission than UDP. UDP is a connection-less protocol. … Read more

Difference between Pragma and Cache-Control headers?

October 18, 2022 by Tarik

Pragma is the HTTP/1.0 implementation and cache-control is the HTTP/1.1 implementation of the same concept. They both are meant to prevent the client from caching the response. Older clients may not support HTTP/1.1 which is why that header is still in use.

How do I create my own URL protocol? (e.g. so://…) [closed]

October 10, 2022 by Tarik

The portion with the HTTP://,FTP://, etc are called URI Schemes You can register your own through the registry. HKEY_CLASSES_ROOT/ your-protocol-name/ (Default) “URL:your-protocol-name Protocol” URL Protocol “” shell/ open/ command/ (Default) PathToExecutable Sources: https://www.iana.org/assignments/uri-schemes/uri-schemes.xhtml, http://msdn.microsoft.com/en-us/library/aa767914(v=vs.85).aspx

Get protocol, domain, and port from URL

September 23, 2022 by Tarik

const full = location.protocol + ‘//’ + location.host;