> It is highly like that the 15.7 update has somehow screwed with Viewmat???
Yes. IMO that's exactly what has happened. I'll stick my neck out and predict that when you do update, viewmat will stop working. Or rather it will work, but show a display of all black pixels. > I will stick with 15.6.1 on the iPhone for the time being No don't do that. You've already helped all you can by confirming the problem appeared with 15.7 and not earlier, as I wondered. Update your phone asap. Apple have just fixed some serious exposures. Everybody now knows that 15.6.1 is vulnerable, and some will know how. On Tue, 20 Sept 2022 at 14:47, Richard Donovan <rsdono...@hotmail.com> wrote: > UPDATE > > Viewmat is still working fine on my iPhone]. It was working on my iPad > till last week. Just noticed that my iPad got auto-updated to iPadOS 15.7 > recently but my iPhone is still on iOS 15.6.1. > > It is highly like that the 15.7 update has somehow screwed with Viewmat??? > > I will stick with 15.6.1 on the iPhone for the time being so if required I > can assist in debugging / comparison. > > > ________________________________ > From: Programming <programming-boun...@forums.jsoftware.com> on behalf of > Ian Clark <earthspo...@gmail.com> > Sent: Tuesday, September 20, 2022 4:49 am > To: programm...@jsoftware.com <programm...@jsoftware.com> > Subject: Re: [Jprogramming] Viewmatnot functioning in IOS J > > > Since 2014, viewmat generated png format file instead of bmp. > > Yes that's true of the JAL addon. But both j701 / j901 for iOS have their > own versions of viewmat, which work in the way I describe. > > On Tue, 20 Sept 2022 at 04:40, bill lam <bbill....@gmail.com> wrote: > > > Since 2014, viewmat generated png format file instead of bmp. > > > > On Tue, Sep 20, 2022 at 11:34 AM Ian Clark <earthspo...@gmail.com> > wrote: > > > > > I confess I'm slightly baffled by Richard's post. AFAIK the value > > returned > > > by the verb: viewmat is undefined, and no meaning can be attached to > it. > > > Viewmat works in different ways on different platforms, but when I > trace > > > the code of verb: viewmat as defined in line 361 of > > > ~addons/graphics/viewmat/viewmat.ijs it typically returns some variant > of > > > empty, EMPTY or i.0 0. > > > > > > > > > So, taking Richard's sample sentences and replacing the argument with > y, > > > it's no surprise that: > > > > > > > > > viewmat y > > > > > > NB. no output > > > > > > > > > $viewmat y > > > > > > 0 0 > > > > > > > > > However while checking this out I've stumbled on the tip of an iceberg. > > > Thank you Richard for alerting me to the fact. > > > > > > > > > The code of Viewmat is involved. It looks as if it's been patched and > > > patched over the years. But whatever the platform, it basically works > by > > > generating a bitmap (BMP) file (i.e. having the extension .bmp) and > then > > > picking one of a bunch of ways to display it. > > > > > > > > > Both j701 and j901 apps for iOS generate a BMP file. j701 wraps the > file > > > path in html code which it then displays using UIKit's (deprecated) > > browser > > > object UIWebView. j901 uses neither UIWebView nor the replacement > > WkWebView > > > to display the BMP file, but instead calls UIKit's image display object > > > UIImageView, which can handle BMP. Or it did once. > > > > > > > > > Apple had recently released updates to several of its systems fixing > > major > > > security exposures. Since then Viewmat *in both j701 and j901* has > > broken. > > > (It was working in both apps in July of this year.) > > > > > > > > > JQt is unaffected. Viewmat still works on a Mac running the latest > > version > > > of Monterey. I'm guessing this is because JQt does not use Apple system > > > code to display the generated BMP. Instead it converts the BMP file > > > contents into an RGB array (a J noun of integer type) and then uses gl2 > > > (glpixels) to display it on a Qt-managed canvas. > > > > > > > > > When I copy the BMP file generated by j901 onto a Mac MBA which is > still > > > running Big Sur, I can readily display it using Preview – and the icon > > > itself shows a thumbnail of the file contents. But I cannot get a newer > > Mac > > > running Monterey to display the very same BMP. Yet Monterey was able to > > do > > > so back in July, before the recent Apple fixes. It's the same story > with > > > iOS. On both platforms Preview now tells me that my BMP file is either > > > corrupt or an unsupported file format. > > > > > > > > > This cannot be a coincidence. It looks as if Apple has simply decided > to > > > cancel BMP on the latest versions of Monterey and iOS. But I find it > hard > > > to believe. Maybe it's just a bug introduced by Apple in its haste to > > shore > > > up its systems. Or maybe the BMP spec is being more closely adhered-to > > than > > > hitherto. > > > > > > > > > I propose to take the matter up with Apple. J needs BMP, even if Apple > > > doesn't. > > > > > > On Mon, 19 Sept 2022 at 18:24, 'Mike Day' via Programming < > > > programm...@jsoftware.com> wrote: > > > > > > > Confirming Raul’s observations on this iPad running J701 under iOS > > 12.5.5 > > > > . > > > > viewmat shows the circle, square and intermediate shape without > > problem, > > > > presumably as required, after copying from the email and pasting into > > the > > > > terminal screen, so Raul probably typed correctly. Also, same > result > > > > using either @ or @: as he found. And image is ok running with the > > > > one-liner pasted into the J701 E screen, ie the script-edit page. > > > > > > > > Cheers, > > > > > > > > Mike > > > > > > > > Sent from my iPad > > > > > > > > > On 19 Sep 2022, at 16:52, Raul Miller <rauldmil...@gmail.com> > wrote: > > > > > > > > > >> On Mon, Sep 19, 2022 at 11:15 AM Richard Donovan < > > > rsdono...@hotmail.com> > > > > wrote: > > > > >> viewmat((1>+/~@:(4^~(%~i:)))*.1<+/~@:(2^~(%~i:)))666 > > > > >> NB. no output > > > > >> > > > > >> $viewmat((1>+/~@:(4^~(%~i:)))*.1<+/~@:(2^~(%~i:)))666 > > > > >> 0 0 > > > > > > > > > > This is probably more a topic for the general forum than the > > > > > programming forum, but viewmat also produces a shape 0 0 result in > > > > > jqt. (In jplayground, it produces a shape 1 result which is a > single > > > > > space..) > > > > > > > > > > In the jqt viewmat, it pops up a new window with the image. In the > > > > > jplayground viewmat, it produces an inline image (JHS viewmat would > > be > > > > > similar to jplayground's viewmat). On my iphone, running j701, the > > > > > above expression presented the viewmat image at the top of the > phone > > > > > (or an expression close to the above -- I hand entered the line, > and > > > > > used @ instead of @: which should produce an equivalent result > here, > > > > > but the point is that I may have inadvertently changed something > > > > > else...). > > > > > > > > > > To be sure that a viewmat image consistently appears, I copied the > > > > > line into the edit window and ran it from there -- when I did so, > the > > > > > edit window was hidden (icon at bottom of region changed from E to > J) > > > > > and the session window and the image window appeared. > > > > > > > > > > So... whatever the problem is, it might depend on the version of J > > you > > > > > are running and/or the version of ios that you are running? > > > > > > > > > > I hope this helps, > > > > > > > > > > -- > > > > > Raul > > > > > > > ---------------------------------------------------------------------- > > > > > For information about J forums see > > http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- > > > > For information about J forums see > http://www.jsoftware.com/forums.htm > > > > > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
