The subject of this conversation is a bit wrong now, but I will keep so that 
the thread continues.

Looking at this a bit further, it looks like there is more than one scheme for 
getting one app to open another.

I find that the Dictionary entry for ‘launch url’ doesn’t quite conform to the 
example in the first link given by Bernard, at least not AFAIKS. The Dictionary 
says that if an app successfully launches another app in order to pass it a 
file, the originating app quits; but I don’t think the example shows that, and 
on a real iPhone for example, a little button appears on the top left of the 
screen allowing one to go back to the originating app. So I think the 
Dictionary is wrong and the example is right, but of course I will try it. 

It’s also stated in the Dictionary that you can launch a file, and the OS will 
attempt to open a ‘default' app that accepts that sort of file. Of course there 
may be many such apps for common formats like text, but there will be one 
chosen by the OS as the default. Again, one needs to experiment.

What it doesn’t say in the example or in the dictionary is how to find the 
equivalent of a Custom URL for an existing app (not an LC app) and thus avoid 
the problem that one may not wish to use the default app to process one’s data.

As ever, I would be very happy for guidance and meanwhile will go on 
experimenting. (This is in part, I admit, displacement activity since my real 
priority is plunging back into the iOS App Deployment system, that gives me the 
jitters every time.)

Graham

> On 22 Oct 2020, at 10:48, Graham Samuel via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> 
> Thanks Bernard - looks very promising! I will experiment. Means a lot of 
> installation into an actual phone, I think, due to the limitations of the 
> Xcode simulator (can’t load existing apps)..
> 
> Very helpful
> 
> Graham
> 
>> On 22 Oct 2020, at 01:08, Bernard Devlin via use-livecode 
>> <use-livecode@lists.runrev.com> wrote:
>> 
>> Hi Graham
>> 
>> I wondered if this information is of use.  URL calls are not limited to
>> "http://";.
>> 
>> Having a LC app respond to a URL call:
>> http://lessons.livecode.com/m/4069/l/58672-using-custom-url-schemes
>> 
>> Apps and their URL schemas:
>> https://ios.gadgethacks.com/news/always-updated-list-ios-app-url-scheme-names-0184033/
>> 
>> Regards
>> Bernard
>> 
>> On Wed, Oct 21, 2020 at 4:33 PM Graham Samuel via use-livecode <
>> use-livecode@lists.runrev.com> wrote:
>> 
>> So far I have not found out how to invoke another app directly from inside
>>> an iOS app, although I think I can invoke a browser using a URL. Perhaps
>>> this is easier than I thought. Will report.
>>> 
>>> Graham
>>> 
>>> 
>>> 
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