World: r4wp

x86 version generation worked well, but the .apk does not work. I 
can see x86 dir, which is empty though. Shouldn't it contain a DLL?

hmm, renamed apk to zip, I can see x86 is not incluede in the package, 
just armeabi dir containing .so library ... needs some other tweaks 
....

Managed to produce an apk, which contains x86 + arm version of demo, 
and it works on both targets!

In order to be able to generate x86 target, do the following:

- copy %build.r into %build-x86.r


- change make-dir/deep bin-dir/lib/armeabi => make-dir/deep bin-dir/lib/x86

- change "-t Android" => "-t Android-x86"


- change "rejoin [%../red/bridges/android/ bin-dir/lib/armeabi" => 
"rejoin [%../red/bridges/android/ bin-dir/lib/x86"


- run %build-x86.r - generates an apk and if you ran arm version 
previously, will pack both versions into one .apk

Bo, the above suggestions are all good. Your code looks OK until 
you start generating the third result image

img3: as-binary size1

is not the way to allocate an image. as-binary is just a type cast, 
like as-integer, not a declaration

So you're pointing img3 to a semi-random memory area that happens 
to have an address equal to the size of the first image. That will 
crash the first time you try to access the image

The correct way to allocate space would be

img3: allocate size1

and then you would have to check for a possible NULL result. Look 
inside the code of read-file-binary to see how that works

You also need to check the return values of read-file-binary and 
write-file-binary, as Arnold already mentioned

After you're done with img3, you should FREE the allocated memory. 
The same for img1 and img2 because the memory was allocated for you 
by read-file-binary

Alternatively, you could reuse either img1 or img2 to produce the 
result image if you don't need them afterwards. That would save the 
allocation and freeing of the third image

To make the algorithm foolproof, you could also check that size1 
and size2 are equal

Apart from the use of as-binary, everything should work. :-) I guess 
you were thrown by the initialisations:

img1: as-binary 0

These are only needed if the later set actions are nested, so your 
above code doesn't need them

I think Bo is comparing two camera images, always the same source,same 
size? Adapt Kaj's suggestion anyway, the check costs almost nothing 
and is worth the trouble.

Yes

Arnold, there is not one account for red.esperconsultancy.nl. Each 
Fossil repository under there has its own account system. But you 
don't need accounts for reading; they're public repositories

Yes I understand now. Is it possible to have a page linking to all 
the Red repositories? 

Alternative is have a special Red-info group with all of the links 
to various Red sites. The repositories, Issue list, Wish list etc 
etc.

The incomplete Contributions page on the Red site is all there is 
so far

I was going to set up a bindings site, but Doc wanted me to work 
on Android support

However, as I've explained before, all repositories follow the same 
naming pattern. If a dependency is #included from a common/ directory 
it's in the Red-common repository

And there's a complete list of all my repositories in my download.r 
script, which you can use to download and update them all in one 
go:

http://red.esperconsultancy.nl/Red-test/dir?ci=tip

Great work on Android, Doc, and nice tweak, Petr :-)

I am surprised that sometimes I can be somehow usefull :-)

:-)

Kaj, thanks! We're about half-way to the full Android Red support 
I have in mind, but it's already usable if you don't mind going through 
the Android API. Fortunately, we'll make that part vanish too with 
some nice high-level abstractions.

Doc, Henrik asks about RPi support, in case it runs Android. Will 
it run?

It's in the FB group ....

The Raspberry hardly runs Android

They say it runs a little, but I've tried it and it's so bad you 
might as well say it doesn't run

Inasfar as it does run, there's no reason Red wouldn't run on it 
now

Doc, what's your timeline on the full support you have in mind?

I need to have objects and ports implemented first, so don't expect 
it before September most probably.

Thanks. So it's not as if it is next year. Where can I see the red 
code for your second hello?

I've renamed it to `eval`, it's in red/bridges/android/samples/eval/.

Thanks for the help everyone, esp. Kaj.  Changing to 'allocate was 
all I needed for my program to work.  Thanks to Doc for the debugging 
hint (run from MS-DOS console).  Don't know why I didn't think of 
that on my own.

Doc, I must be in some other world. Where is red/bridges?

I checked the pastebin link and saw the code.

It's in the dyn-lib-emitter branch. I guess you were looking in master?

https://github.com/dockimbel/Red/tree/dyn-lib-emitter/red/bridges/android/samples/eval

Kaj, thanks. Yes, I was in master! Perfect.

Almost the same as another world ;-)

When you're lost it is exactly the same. The problem with me is that 
I come in and out of these conversations and so end up not building 
on top of previous knowledge. Every trip into red-landia is a new 
one :-)

While I am at it, I'm on the dyn-lib-emitter page, is there something 
I click on to download the entire dyn-lib folder?

Nevermind. I just created an account and now see the zip button.