World: r4wp

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.

I thought it worked without an account. But I haven't been logged 
out for a long time

I don't know if I am using it correctly but I attempted to run the 
build.r file (w/o any arguments...I think it builds the "eval.red"). 
I end up with:
Signing apk...
'jarsigner' is not recognized as an internal or external command,
operable program or batch file.
Aligning apk...
Unable to open 'builds\eval-signed.apk' as zip archive

It should have downloaded the jarsigner and other tools

Do you have a JDK installed?

Interesting, the lines for downloading that are commented out. I 
will try it again. I do have the JDK installed as I was doing some 
driod app stuff a while back.

Seems a mistake

Wonder how it worked for Petr

Getting closer. I now have jarsigner but the cmd expected to see 
it in the root dir. So I just placed jarsigner there along with the 
jli.dll.  That may not be a good idea because it seems to do its 
thing but finally dies with:
Signing apk...

Error: Could not find or load main class sun.security.tools.JarSigner
Aligning apk...
Unable to open 'builds\eval-signed.apk' as zip archive

Looks like Doc and Petr had jarsigner already installed with their 
tool suite

At this point I am stuck on the sun.security.tools.JarSigner file 
issue.