[MacRuby-devel] Mixing Objective-C and Ruby classes

Brian Chapados chapbr at gmail.com
Wed May 20 12:23:24 PDT 2009


I was able to reproduce your bug, and have a fix. This was somewhat
obscure, but RTFM to the rescue...

Note that GetApplicationEventTarget is not available on 64-bit systems
(see Notes in the docs):
http://developer.apple.com/documentation/Carbon/Reference/Carbon_Event_Manager_Ref/Reference/reference.html#//apple_ref/c/func/GetApplicationEventTarget

Although you were not calling it directly, the macro
InstallApplicationEventHandler() was calling it for you. I had
compiled macruby with archs="i386" so it was working fine for me.
When I did a default build it broke.

In general, always double-check any Carbon stuff for
64bit-compatibility issues. I think Apple has said that Carbon is
being phased out.  Maybe someone else knows more about that than I do.

To make a long story short, just use GetEventMonitorTarget() to send
your hotkey event to the event monitor.  That seems to be available on
both platforms.

I updated the gists with the new Obj-C code and hotcocoa file.
Obj-C: http://gist.github.com/114521
hotcocoa: http://gist.github.com/114523

Brian


On Wed, May 20, 2009 at 9:11 AM, Brian Chapados <chapbr at gmail.com> wrote:
> I didn't use the hotcocoa cli interface to generate the file, so I
> don't have a Rakefile or anything.  I just used a text editor and
> followed an old example[1]. Try putting the ruby code into a file
> called 'shortcutapp.rb' and type:
>
> [1]: http://andymatuschak.org/articles/2008/09/12/hotcocoa-is-pretty-damn-hot/
>
> macruby shortcutapp.rb
>
> If you want to package things up into an actual .app bundle, then you
> would need a slightly different approach.   It shouldn't be too bad,
> since hotcocoa helps you layout your code in a sensible way.  Make
> sure the above works first, then go from there.
>
> On Wed, May 20, 2009 at 2:53 AM, isaac kearse <isaackearse at gmail.com> wrote:
>> Hi Brian,
>> I tried running your minimal app but it crashed with a similar error.  Here
>> are all the gory details (including Problem Details and System Profile from
>> the crash reporter):
>> http://gist.github.com/114723
>>
>> I have also put the whole directory structure for the minimal hotcocoa app
>> on github so we can be sure we are running exactly the same app:
>> http://github.com/isaac/shortcut/tree/master
>> I also got a few more warnings when compiling shortcut.m but I am assuming I
>> can just ignore them? (I included them at the bottom of the gist also)
>> Cheers,
>> Isaac
>> On Wed, May 20, 2009 at 1:10 PM, isaac kearse <isaackearse at gmail.com> wrote:
>>>
>>> Yeah I think you're right.  I was calling it inside a hotcocoa app but not
>>> in the application context.  I'll try it out tonight and let you know how it
>>> goes.
>>> Thanks a lot for walking me through this.
>>> On Wed, May 20, 2009 at 12:47 PM, Brian Chapados <chapbr at gmail.com> wrote:
>>>>
>>>> I'm not sure how you're testing this, but beware of doing this from a
>>>> command line-only script or through macirb.  I suspect you need to be
>>>> in an Application context (or hook into the event loop through some
>>>> other means).  It works from a minimal hotcocoa app:
>>>> http://gist.github.com/114523
>>>>
>>>> I also made some slight modifications to your Obj-C code to add a
>>>> delegate that gives you a callback hook that you can define in Ruby.
>>>> There is probably a better way to do this, but this was fast.
>>>> see: http://gist.github.com/114521
>>>>
>>>> Note that I changed the keyboard shortcut to controlKey+optionKey, so
>>>> you'll need to press Control+Option+Space.
>>>>
>>>>
>>>> On Tue, May 19, 2009 at 4:33 PM, isaac kearse <isaackearse at gmail.com>
>>>> wrote:
>>>> > Hey thanks Brian that worked!
>>>> > I tried compiling with the Carbon Framework but I didn't think to try
>>>> > it
>>>> > with both Carbon and Foundation.  I still got the warning "makes
>>>> > pointer
>>>> > from integer without a cast" but I'm just ignoring that :)
>>>> > So the bundle was created and I compiled it and required it my app.
>>>> > But when I actually call it with "Shortcut.new.addShortcut" (from the
>>>> > start
>>>> > method in my application.rb) I get a nasty error:
>>>> > isaac:~/src/tasks isaac$ macrake
>>>> > (in /Users/isaac/src/tasks)
>>>> >
>>>> > /Users/isaac/src/tasks/Tasks.app/Contents/Resources/lib/application.rb:12:
>>>> > [BUG] Segmentation fault
>>>> > MacRuby version 0.4 (ruby 1.9.1) [universal-darwin9.0, x86_64]
>>>> > -- stack frame ------------
>>>> > 0000 (0xc08000060): 00000004
>>>> > 0001 (0xc08000068): 00000000
>>>> > 0002 (0xc08000070): 00000004
>>>> > 0003 (0xc08000078): 00000000
>>>> > 0004 (0xc08000080): 00000004
>>>> > 0005 (0xc08000088): 00000000
>>>> > 0006 (0xc08000090): 00000004
>>>> > 0007 (0xc08000098): 80003ffe0
>>>> > 0008 (0xc080000a0): 00000004
>>>> > 0009 (0xc080000a8): 00000000
>>>> > 0010 (0xc080000b0): 00000004
>>>> > 0011 (0xc080000b8): 00000000
>>>> > 0012 (0xc080000c0): 00000004
>>>> > 0013 (0xc080000c8): 00000000
>>>> > 0014 (0xc080000d0): 8004f3380
>>>> > 0015 (0xc080000d8): 00000004
>>>> > 0016 (0xc080000e0): 00000000
>>>> > 0017 (0xc080000e8): 8004eb020
>>>> > 0018 (0xc080000f0): 00000004
>>>> > 0019 (0xc080000f8): 00000000 <- lfp <- dfp
>>>> > -- control frame ----------
>>>> > c:0008 p:---- s:0020 b:0020 l:000019 d:000019 CFUNC  :addShortcut
>>>> > c:0007 p:0019 s:0017 b:0017 l:000016 d:000016 METHOD
>>>> >
>>>> > /Users/isaac/src/tasks/Tasks.app/Contents/Resources/lib/application.rb:12
>>>> > c:0006 p:0103 s:0014 b:0014 l:000013 d:000013 TOP
>>>> >
>>>> >  /Users/isaac/src/tasks/Tasks.app/Contents/Resources/lib/application.rb:297
>>>> > c:0005 p:---- s:0012 b:0012 l:000011 d:000011 FINISH :set_encoding:
>>>> > c:0004 p:---- s:0010 b:0010 l:000009 d:000009 CFUNC  :load
>>>> > c:0003 p:0043 s:0006 b:0006 l:000005 d:000005 TOP
>>>> >  /Users/isaac/src/tasks/Tasks.app/Contents/Resources/rb_main.rb:2
>>>> > c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH :inherited:
>>>> > c:0001 p:0000 s:0002 b:0002 l:000001 d:000001 TOP
>>>> > ---------------------------
>>>> > DBG> :
>>>> >
>>>> > "/Users/isaac/src/tasks/Tasks.app/Contents/Resources/lib/application.rb:12:in
>>>> > `addShortcut'"
>>>> > DBG> :
>>>> >
>>>> > "/Users/isaac/src/tasks/Tasks.app/Contents/Resources/lib/application.rb:12:in
>>>> > `start'"
>>>> > DBG> :
>>>> >
>>>> > "/Users/isaac/src/tasks/Tasks.app/Contents/Resources/lib/application.rb:297:in
>>>> > `<top (required)>'"
>>>> > DBG> :
>>>> > "/Users/isaac/src/tasks/Tasks.app/Contents/Resources/rb_main.rb:2:in
>>>> > `load'"
>>>> > DBG> :
>>>> > "/Users/isaac/src/tasks/Tasks.app/Contents/Resources/rb_main.rb:2:in
>>>> > `<main>'"
>>>> > -- backtrace of native function call (Use addr2line) --
>>>> > 0x10010f2c1
>>>> > 0x100029334
>>>> > 0x100029418
>>>> > 0x1000c240d
>>>> > 0x7fff803763fa
>>>> > 0x0
>>>> > 0x7fff8108094d
>>>> > 0x105a31e8c
>>>> > 0x100121855
>>>> > 0x10010af7d
>>>> > 0x10010074f
>>>> > 0x1001056e2
>>>> > 0x10010596c
>>>> > 0x100030c96
>>>> > 0x100030d15
>>>> > 0x10010ada7
>>>> > 0x10010074f
>>>> > 0x1001056e2
>>>> > 0x10010596c
>>>> > 0x10002cd32
>>>> > 0x1000300f7
>>>> > 0x100118723
>>>> > 0x100000f84
>>>> > 0x100000f40
>>>> > -------------------------------------------------------
>>>> > Any ideas?
>>>> > Cheers,
>>>> > Isaac
>>>> > On Wed, May 20, 2009 at 10:59 AM, Brian Chapados <chapbr at gmail.com>
>>>> > wrote:
>>>> >>
>>>> >> Those symbols are defined in the Carbon framework. Try compiling with:
>>>> >>
>>>> >> cc shortcut.m -o shortcut.bundle -g -framework Foundation -framework
>>>> >> Carbon -dynamiclib -fobjc-gc -arch i386 -arch x86_64
>>>> >>
>>>> >> On Tue, May 19, 2009 at 1:32 PM, isaac kearse <isaackearse at gmail.com>
>>>> >> wrote:
>>>> >> > Hi Guys,
>>>> >> > I am writing a hotcocoa app, and I want to register a global
>>>> >> > keyboard
>>>> >> > shortcut so that I can perform an action in my app from any
>>>> >> > application.
>>>> >> > AFAIK you need to go down to Carbon to do this as documented here:
>>>> >> >
>>>> >> >
>>>> >> > http://cocoasamurai.blogspot.com/2009/03/global-keyboard-shortcuts-with-carbon.html
>>>> >> > This is the code I have so far: http://gist.github.com/114372
>>>> >> > When I try and package this as a bundle using the technique that
>>>> >> > Laurent
>>>> >> > demonstrated earlier in this thread I get these errors:
>>>> >> > isaac:~/src/tasks isaac$ gcc shortcut.m -o shortcut.bundle -g
>>>> >> > -framework
>>>> >> > Foundation -dynamiclib -fobjc-gc -arch i386 -arch x86_64
>>>> >> > shortcut.m: In function ‘-[Shortcut addShortcut]’:
>>>> >> > shortcut.m:25: warning: passing argument 1 of ‘InstallEventHandler’
>>>> >> > makes
>>>> >> > pointer from integer without a cast
>>>> >> > shortcut.m:28: warning: passing argument 4 of ‘RegisterEventHotKey’
>>>> >> > makes
>>>> >> > pointer from integer without a cast
>>>> >> > Undefined symbols:
>>>> >> >   "_GetApplicationEventTarget", referenced from:
>>>> >> >       -[Shortcut addShortcut] in cckmYEc0.o
>>>> >> >       -[Shortcut addShortcut] in cckmYEc0.o
>>>> >> >   "_RegisterEventHotKey", referenced from:
>>>> >> >       -[Shortcut addShortcut] in cckmYEc0.o
>>>> >> >   "_InstallEventHandler", referenced from:
>>>> >> >       -[Shortcut addShortcut] in cckmYEc0.o
>>>> >> > ld: symbol(s) not found
>>>> >> > collect2: ld returned 1 exit status
>>>> >> > Undefined symbols:
>>>> >> >   "_GetApplicationEventTarget", referenced from:
>>>> >> >       -[Shortcut addShortcut] in ccIWfnrB.o
>>>> >> >       -[Shortcut addShortcut] in ccIWfnrB.o
>>>> >> >   "_RegisterEventHotKey", referenced from:
>>>> >> >       -[Shortcut addShortcut] in ccIWfnrB.o
>>>> >> >   "_InstallEventHandler", referenced from:
>>>> >> >       -[Shortcut addShortcut] in ccIWfnrB.o
>>>> >> > ld: symbol(s) not found
>>>> >> > collect2: ld returned 1 exit status
>>>> >> > lipo: can't open input file:
>>>> >> > /var/folders/sm/smWEZrv7GueXZu2JpgAAuU+++TI/-Tmp-//ccX5Acy0.out (No
>>>> >> > such
>>>> >> > file or directory)
>>>> >> > I really have no idea what I'm doing here, so any ideas would be
>>>> >> > appreciated
>>>> >> > :)
>>>> >> > Cheers,
>>>> >> > Isaac
>>>> >> > On Mon, Apr 20, 2009 at 11:49 PM, victor jalencas
>>>> >> > <macruby-devel at principia.info> wrote:
>>>> >> >>
>>>> >> >> Many thanks John and Laurent.
>>>> >> >>
>>>> >> >>  After reading your messages I came back to XCode and discovered I
>>>> >> >> had
>>>> >> >> made a typo in the ObjC part of the code (which, curiously,
>>>> >> >> compiled)
>>>> >> >> and that's why my ruby code didn't find my selector.
>>>> >> >>
>>>> >> >>  As for calling ruby code from the obj-c side, I agree it's a bit
>>>> >> >> convoluted (not to mention deprecated). I hope there's a better way
>>>> >> >> to
>>>> >> >> do that in store for upcoming versions. If I understood well your
>>>> >> >> example, you first created the Obj-C subclass and later,
>>>> >> >> dynamically,
>>>> >> >> set its parent to be the ruby class. Anyway, seeing that the norm
>>>> >> >> in
>>>> >> >> Cocoa is delegation rather than extension, and if all ruby classes
>>>> >> >> are
>>>> >> >> readily available in Obj-C, I think I'll manage with just calling
>>>> >> >> ruby
>>>> >> >> code instead of extending it. Apparently I lacked only calling the
>>>> >> >> sharedRuntime method, will need to experiment a bit more when I get
>>>> >> >> back to my Mac.
>>>> >> >>
>>>> >> >>
>>>> >> >>
>>>> >> >> cheers,
>>>> >> >> Victor
>>>> >> >>
>>>> >> >> --
>>>> >> >> --
>>>> >> >> Victor Jalencas <victor at carotena.net>
>>>> >> >> _______________________________________________
>>>> >> >> MacRuby-devel mailing list
>>>> >> >> MacRuby-devel at lists.macosforge.org
>>>> >> >> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>>>> >> >
>>>> >> >
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>>>> >> >
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