Is there a way of detecting whether a url handler exists for a particular protocol?

General Programming
1

@TomCatchesides re : is there a handler ?
On macOS you might prefer NSWorkspace URLForApplicationToOpenURL
This returns the URL for the default app if there is one
I’d bet MBS has a call for this as well

The LaunchServices call is deprecated
https://developer.apple.com/documentation/coreservices/1443240-lscopyallhandlersforurlscheme?language=objc

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This trick is how I get my help files to open in your web browser even if you have HTML files set to open with a text editor. Ask NSWorkspace which app opens https:// and send the file there instead of FolderItem.Open.

3

There’s no guarantee it WILL be any particular one
The order isnt guaranteed

All this will tell you is there IS something that says it can open a particular URL

And, unlike the launch services API there doesnt seem to be one that returns the URI’s for everything that says it CAN open a specific URI
But it strikes me there should be since that data is all recorded somewhere in the launch services databases

4

It looks like the MBS plugin has a way:
https://www.monkeybreadsoftware.net/global-launchservicesallhandlersforurlschemembs.shtml

5

We also have:
shared method URLForApplicationToOpenURL(url as string) as string

6

Thanks, @npalardy ! (and everyone else who’s contributed to this)

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7

That likely uses the deprecated API I mentioned

8

I added the declares for this in the Ohanaware App Kit, I don’t recall is I used NSWorkspace or not. I’ll check later on in the day.

I needed to know which e-mail client the customer was using so I could offer to attach files or not to the e-mail. Apple’s Sharing Services completely suck in recent years, Apple used to handle this for you, but since “Privacy” they only care about Apple Mail.

9

That’s so Apple-like, these days… :roll_eyes:

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10

God forbid we provide anything super useful
Secure ? yeah we got that covered !
Deprecate everything !

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11

The code I use in the public OAK demo app is as follows.

dummyURL                  = NSURLWithString( NSURLClass, "https://www.ohanaware.com" )
Dim webBrowser as integer = NSWorkspaceURLForApplicationToOpenURL( NSWorkspaceSharedWorkspace, dummyURL )
if webBrowser <> 0 then
  list.append new textAndIconRow( "Web Browser", NSURLDisplayName( webBrowser ), NSWorkspaceIconForFile( NSWorkspaceSharedWorkspace, NSURLPath( webBrowser ) ) )
end if