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Has anyone idea what does it mean: objc:// In this javascript sample code line: var invokeString = "objc://planner/openPDF?" + encodeURIComponent(fileName);

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    it seems to be some custom URL handler protocol which is handled by an external application installed on the users machine. – Philipp Dec 11 '12 at 13:00
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    It could be objective-c !!! The user works for ios and/or in obj-c and set his drive name to objc – Anoop Vaidya Dec 11 '12 at 13:01
  • @AnoopVaidya Objective-C is not an application, and it appears to open a PDF of some sort, so I doubt it. – Waleed Khan Dec 11 '12 at 13:02
  • [Looks similar to me](http://stackoverflow.com/questions/1662473/how-to-call-objective-c-from-javascript). – The Alpha Dec 11 '12 at 13:04

2 Answers2

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In this case objc:// is a custom scheme, as http. Amongst other things it can be used to open a application that's registered for this protocol on Mac/iOS (I'm not sure if this is supported on windows or not).

Let's say my ios-app "Planner" is registered to handle objc:// then when accessing this URL in the browser the app will open "Planner" app on my iPhone and pass the URL to the app in the same way http://www.google.com opens you Safari (Or you standard browser) app and passes google.com.

Another example is Apple using itmss:// for links to thier iTunes Music Store. Clicking one of thoses links will open the Music Store in iTines.

Here's an article about registering schemes on iOS. And wiki about URI schemes

UPDATE

As Sheikh Heera commented, it can also be used as a way to communicate between an UIWebView (running an HTML/JS page) in an objective-c application (iOS/Mac) and the native application.

fredrik
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I've Googled it and found Calling Objective-C Methods From JavaScript, it says you can call Objective C methods by invoking URL with custom protocol like

document.location="mycustomprotocolname:functionName?param1=value1&param2=value2..."

So objc:// looks like a custom protocol to call an Objective-C Method here.

The Alpha
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