# Embedding 1.9 **URL:** \ **Category:** ruby-talk\ **Created:** [7 January 2008 21:44 UTC](https://rubytalk.org/t/embedding-1-9/43583 "2008-01-07T21:44:08Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![Dave\_Mail\_Archive](https://avatars.discourse-cdn.com/v4/letter/d/f04885/32.png) [@Dave\_Mail\_Archive](https://rubytalk.org/u/Dave_Mail_Archive)\ **Post date:** [7 January 2008 21:44 UTC](https://rubytalk.org/t/embedding-1-9/43583/1 "2008-01-07T21:44:08Z")
Folks: I'm working on the "Extending Ruby" chapter (now an appendix) for the third PickAxe, and I'm finding a whole bunch of conflicting information. Reading the source, it seems like there's no canonical way of embedding Ruby in a C application. I have lots of alternatives that \_seem\_ to work, but I want to be more authoritative than that. Does anyone have any pointers to stuff that would help? Thanks Dave ---
**Author:** ![Mark\_Guzman](https://avatars.discourse-cdn.com/v4/letter/m/f4b2a3/32.png) [@Mark\_Guzman](https://rubytalk.org/u/Mark_Guzman)\ **Post date:** [8 January 2008 01:41 UTC](https://rubytalk.org/t/embedding-1-9/43583/2 "2008-01-08T01:41:14Z")
Have you checked out VIM? It has ruby embedded and provides an interface into vim buffers from ruby. HTH. Good luck.   --mark > **···** > > -- > blog: [http://hasno.info](http://hasno.info) > > Dave Thomas wrote: > > > Folks: > > > > I'm working on the "Extending Ruby" chapter (now an appendix) for the third PickAxe, and I'm finding a whole bunch of conflicting information. Reading the source, it seems like there's no canonical way of embedding Ruby in a C application. I have lots of alternatives that \_seem\_ to work, but I want to be more authoritative than that. > > > > Does anyone have any pointers to stuff that would help? > > > > Thanks > > > > Dave ---
**Author:** ![Yukihiro\_Matsumoto2](https://avatars.discourse-cdn.com/v4/letter/y/b9e5f3/32.png) [@Yukihiro\_Matsumoto2](https://rubytalk.org/u/Yukihiro_Matsumoto2)\ **Post date:** [8 January 2008 03:36 UTC](https://rubytalk.org/t/embedding-1-9/43583/3 "2008-01-08T03:36:56Z")
Hi, > Folks: > > I'm working on the "Extending Ruby" chapter (now an appendix) for the > third PickAxe, and I'm finding a whole bunch of conflicting > information. Reading the source, it seems like there's no canonical > way of embedding Ruby in a C application. I have lots of alternatives > that \_seem\_ to work, but I want to be more authoritative than that. > > Does anyone have any pointers to stuff that would help? Perhaps "authoritative" means "information from the original author" but I don't remember I wrote such document (sigh). Basically, you have to call:   ruby\_sysinit() for command line argument initialization (optional)   RUBY\_INIT\_STACK() for GC stack initialization   ruby\_init() for ruby interpreter initialization and wrap ruby calls with rb\_protect() for initialize exception frame. You can load Ruby programs with rb\_load(). You can call ruby programs from string via rb\_eval\_string().               matz. > **···** > > In message "Re: Embedding 1.9" on Tue, 8 Jan 2008 06:44:08 +0900, Dave Thomas \ writes: ---
**Author:** ![Dave\_Mail\_Archive](https://avatars.discourse-cdn.com/v4/letter/d/f04885/32.png) [@Dave\_Mail\_Archive](https://rubytalk.org/u/Dave_Mail_Archive)\ **Post date:** [8 January 2008 03:23 UTC](https://rubytalk.org/t/embedding-1-9/43583/4 "2008-01-08T03:23:02Z")
Mark: I don;t believe it has Ruby 1.9, though. Dave > **···** > > On Jan 7, 2008, at 7:41 PM, Mark Guzman wrote: > > > Have you checked out VIM? It has ruby embedded and provides an interface into vim buffers from ruby. HTH. Good luck. ---
**Author:** ![Dave\_Mail\_Archive](https://avatars.discourse-cdn.com/v4/letter/d/f04885/32.png) [@Dave\_Mail\_Archive](https://rubytalk.org/u/Dave_Mail_Archive)\ **Post date:** [8 January 2008 04:22 UTC](https://rubytalk.org/t/embedding-1-9/43583/5 "2008-01-08T04:22:01Z")
In 1.9, do we also now need to call set\_locale()? Dave > **···** > > On Jan 7, 2008, at 9:36 PM, Yukihiro Matsumoto wrote: > > > Perhaps "authoritative" means "information from the original author" > > but I don't remember I wrote such document (sigh). > > > > Basically, you have to call: > > > > ruby\_sysinit() for command line argument initialization (optional) > > RUBY\_INIT\_STACK() for GC stack initialization > > ruby\_init() for ruby interpreter initialization > > > > and wrap ruby calls with rb\_protect() for initialize exception frame. > > You can load Ruby programs with rb\_load(). You can call ruby programs > > from string via rb\_eval\_string(). ---
**Author:** ![Edwin\_Pratomo1](https://avatars.discourse-cdn.com/v4/letter/e/2bfe46/32.png) [@Edwin\_Pratomo1](https://rubytalk.org/u/Edwin_Pratomo1)\ **Post date:** [9 January 2008 09:45 UTC](https://rubytalk.org/t/embedding-1-9/43583/6 "2008-01-09T09:45:44Z")
good day all, while it's still hot talking about embedding, let me ask a related question here: is there any way to do reflection from ruby C API? rgds, Edwin. > **···** > > On Tuesday 08 January 2008 10:36:56 am Yukihiro Matsumoto wrote: > > > Basically, you have to call: > > > >   ruby\_sysinit() for command line argument initialization (optional) > >   RUBY\_INIT\_STACK() for GC stack initialization > >   ruby\_init() for ruby interpreter initialization > > > > and wrap ruby calls with rb\_protect() for initialize exception frame. > > You can load Ruby programs with rb\_load(). You can call ruby programs > > from string via rb\_eval\_string(). > > > >               matz. ---
**Author:** ![Yukihiro\_Matsumoto2](https://avatars.discourse-cdn.com/v4/letter/y/b9e5f3/32.png) [@Yukihiro\_Matsumoto2](https://rubytalk.org/u/Yukihiro_Matsumoto2)\ **Post date:** [8 January 2008 04:40 UTC](https://rubytalk.org/t/embedding-1-9/43583/7 "2008-01-08T04:40:01Z")
Hi, > **···** > > In message "Re: Embedding 1.9" on Tue, 8 Jan 2008 13:22:01 +0900, Dave Thomas \ writes: > > > In 1.9, do we also now need to call set\_locale()? > > Do you mean setlocale()? It's optional. If you call it, > Encoding.default\_external will be set according to your locale, > otherwise it will be ASCII-8BIT. > >               matz. ---
**Author:** ![Mark\_Guzman](https://avatars.discourse-cdn.com/v4/letter/m/f4b2a3/32.png) [@Mark\_Guzman](https://rubytalk.org/u/Mark_Guzman)\ **Post date:** [8 January 2008 06:20 UTC](https://rubytalk.org/t/embedding-1-9/43583/8 "2008-01-08T06:20:31Z")
Dave Thomas wrote: > > Have you checked out VIM? It has ruby embedded and provides an interface into vim buffers from ruby. HTH. Good luck. > > Mark: > > I don;t believe it has Ruby 1.9, though. > > Dave Quite true. My addled eyes missed the blatant 1.9 in the title. It did get me started on applying a little elbow work to them problem. The vim code ports to 1.9 just fine. Changing a few of those pesky RSTRING(xyz)-\>ptr and len's to their new macros eliminates the majority of the compile errors. The only other item seems to be error info handling, which went from being a static variable to a function rb\_errinfo. I'm sure you've already run into all the nitty gritty. I've attached a patch versus the current vim trunk. I haven't tried anything more intensive than loading and executing a simple file as of yet. --mark [if\_ruby\_19.patch](https://rubytalk.org/uploads/short-url/3S9kyJcDIsckvDaNMYtnEX2RBAI.patch) (3.26 KB) > **···** > > > On Jan 7, 2008, at 7:41 PM, Mark Guzman wrote: ---
**Author:** ![Yukihiro\_Matsumoto2](https://avatars.discourse-cdn.com/v4/letter/y/b9e5f3/32.png) [@Yukihiro\_Matsumoto2](https://rubytalk.org/u/Yukihiro_Matsumoto2)\ **Post date:** [9 January 2008 09:53 UTC](https://rubytalk.org/t/embedding-1-9/43583/9 "2008-01-09T09:53:15Z")
Hi, > **···** > > In message "Re: Embedding 1.9" on Wed, 9 Jan 2008 18:45:44 +0900, Edwin Pratomo \ writes: > > > while it's still hot talking about embedding, let me ask a related question > > here: is there any way to do reflection from ruby C API? > > What kind of reflection? You can define classes, inspect variables, > etc. from C. > >               matz. ---
**Author:** ![Dave\_Mail\_Archive](https://avatars.discourse-cdn.com/v4/letter/d/f04885/32.png) [@Dave\_Mail\_Archive](https://rubytalk.org/u/Dave_Mail_Archive)\ **Post date:** [8 January 2008 07:08 UTC](https://rubytalk.org/t/embedding-1-9/43583/10 "2008-01-08T07:08:20Z")
Mark: Are you manually defining the TAG\_xxx values somewhere? eval\_intern.h isn't installed onto the user side on my box. Dave > **···** > > On Jan 8, 2008, at 12:20 AM, Mark Guzman wrote: > > >     case TAG\_RAISE: > >     case TAG\_FATAL: ---
**Author:** ![Michal\_hramrach\_Such](https://avatars.discourse-cdn.com/v4/letter/m/3ab097/32.png) [@Michal\_hramrach\_Such](https://rubytalk.org/u/Michal_hramrach_Such)\ **Post date:** [8 January 2008 07:59 UTC](https://rubytalk.org/t/embedding-1-9/43583/11 "2008-01-08T07:59:20Z")
However, calling setlocale should not break ruby 1.9 since the interpreter does it as well 😉 Thanks Michal > **···** > > On 08/01/2008, Yukihiro Matsumoto \ wrote: > > > Hi, > > > > In message "Re: Embedding 1.9" \> on Tue, 8 Jan 2008 13:22:01 +0900, Dave Thomas \ writes: > > > > \>In 1.9, do we also now need to call set\_locale()? > > > > Do you mean setlocale()? It's optional. If you call it, > > Encoding.default\_external will be set according to your locale, > > otherwise it will be ASCII-8BIT. ---
**Author:** ![Edwin\_Pratomo](https://avatars.discourse-cdn.com/v4/letter/e/43a26b/32.png) [@Edwin\_Pratomo](https://rubytalk.org/u/Edwin_Pratomo)\ **Post date:** [9 January 2008 10:17 UTC](https://rubytalk.org/t/embedding-1-9/43583/12 "2008-01-09T10:17:13Z")
in particular, what I would like to do is Object.private\_methods, in C way. rgds, Edwin. > **···** > > --- Yukihiro Matsumoto \ wrote: > > > Hi, > > > > In message "Re: Embedding 1.9" \> on Wed, 9 Jan 2008 18:45:44 +0900, Edwin Pratomo \ \> writes: > > > > \>while it's still hot talking about embedding, let me ask a related question > > \>here: is there any way to do reflection from ruby C API? > > > > What kind of reflection? You can define classes, inspect variables, > > etc. from C. > >       \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ > Bergabunglah dengan orang-orang yang berwawasan, di di bidang Anda! Kunjungi Yahoo! Answers saat ini juga di [http://id.answers.yahoo.com/](http://id.answers.yahoo.com/) ---
**Author:** ![Dave\_Mail\_Archive](https://avatars.discourse-cdn.com/v4/letter/d/f04885/32.png) [@Dave\_Mail\_Archive](https://rubytalk.org/u/Dave_Mail_Archive)\ **Post date:** [8 January 2008 17:04 UTC](https://rubytalk.org/t/embedding-1-9/43583/13 "2008-01-08T17:04:02Z")
Right. The interpreter calls a bunch of methods during initialization. I'm trying to determine the minimum subset required for safe 1.9 operation. I \_think\_ I've got it now, and I'll be pushing it as part of the beta in the next few days. Thanks Dave > **···** > > On Jan 8, 2008, at 1:59 AM, Michal Suchanek wrote: > > > However, calling setlocale should not break ruby 1.9 since the > > interpreter does it as well 😉 ---
**Author:** ![Mark\_Guzman](https://avatars.discourse-cdn.com/v4/letter/m/f4b2a3/32.png) [@Mark\_Guzman](https://rubytalk.org/u/Mark_Guzman)\ **Post date:** [8 January 2008 17:05 UTC](https://rubytalk.org/t/embedding-1-9/43583/14 "2008-01-08T17:05:19Z")
\<(08/01/08 16:08) Dave Thomas\> > Are you manually defining the TAG\_xxx values somewhere? eval\_intern.h isn't > installed onto the user side on my box. Dave, Those are defined locally in if\_ruby.c, that seems to be the convention as the tcltk extension does the same. I wonder if those should be pushed into ruby.h to ease embedding...?   --mark > **···** > > -- > Those the gods wish to destroy they call promising. > blog: [http://hasno.info](http://hasno.info) ---
**Author:** ![Dave\_Mail\_Archive](https://avatars.discourse-cdn.com/v4/letter/d/f04885/32.png) [@Dave\_Mail\_Archive](https://rubytalk.org/u/Dave_Mail_Archive)\ **Post date:** [9 January 2008 13:54 UTC](https://rubytalk.org/t/embedding-1-9/43583/15 "2008-01-09T13:54:07Z")
To call a method that's available in RUby, just use rb\_funcall     rb\_funcall(receiver, mid, argc, arg, arg, ...) The mid parameter is the ID of the method to invoke (nor its name) and the arguments (if any) are VALUEs, Dave > **···** > > On Jan 9, 2008, at 4:17 AM, Edwin Pratomo wrote: > > > in particular, what I would like to do is Object.private\_methods, in C way. ---
**Author:** ![Dave\_Mail\_Archive](https://avatars.discourse-cdn.com/v4/letter/d/f04885/32.png) [@Dave\_Mail\_Archive](https://rubytalk.org/u/Dave_Mail_Archive)\ **Post date:** [8 January 2008 18:03 UTC](https://rubytalk.org/t/embedding-1-9/43583/16 "2008-01-08T18:03:49Z")
That'd get my vote. I've copied core on this.. Dave > **···** > > On Jan 8, 2008, at 11:05 AM, Mark Guzman wrote: > > > > Are you manually defining the TAG\_xxx values somewhere? eval\_intern.h isn't > > > installed onto the user side on my box. > > > > Dave, > > Those are defined locally in if\_ruby.c, that seems to be the convention > > as the tcltk extension does the same. I wonder if those should be pushed > > into ruby.h to ease embedding...? ---
**Author:** ![Edwin\_Pratomo](https://avatars.discourse-cdn.com/v4/letter/e/43a26b/32.png) [@Edwin\_Pratomo](https://rubytalk.org/u/Edwin_Pratomo)\ **Post date:** [10 January 2008 01:03 UTC](https://rubytalk.org/t/embedding-1-9/43583/17 "2008-01-10T01:03:10Z")
thanks dave, for the pointer. now I got the following code works (but there is some problem): static VALUE eval\_failed() {     printf("eval failed\n");     return Qnil; }      static VALUE my\_each(VALUE obj) {     return rb\_funcall(obj, rb\_intern("each"), 0); } static VALUE my\_iterator(VALUE obj) {     int error;     VALUE result;     result = rb\_protect(my\_each, obj, &error);     return error ? Qnil : result; } static VALUE my\_iterator\_block(VALUE res) {     printf("args: %s\n", STR2CSTR(rb\_inspect(res)));     return Qnil; } int main(void) {     char \*silly = "def foo; end";     ruby\_init();     ruby\_init\_loadpath();     /\* def foo \*/     rb\_rescue(rb\_eval\_string, (VALUE)silly, eval\_failed, 0);     /\* Object.private\_methods \*/     {         VALUE obj = rb\_funcall(rb\_cObject, rb\_intern("private\_methods"), 0);         if (TYPE(obj) == T\_ARRAY) {             printf("Array!\n");             /\* obj.each {|v| pp v } \*/             rb\_iterate(                 my\_iterator,                 obj,                 my\_iterator\_block,                 0             );         } else {             printf("Not array! Can't proceed\n");         }     }     ruby\_finalize();     exit(0); } \_\_END\_\_ but "foo" is not there! why is it different from: def foo end Object.private\_methods.each do |x|   puts x end puts "====================" Object.private\_methods.select {|x| x =~ /foo/ }.each do |x|   puts x end \_\_END\_\_ rgds, Edwin. > **···** > > --- Dave Thomas \ wrote: > > > On Jan 9, 2008, at 4:17 AM, Edwin Pratomo wrote: > > > > \> in particular, what I would like to do is Object.private\_methods, in > > \> C way. > > > > To call a method that's available in RUby, just use rb\_funcall > > > >     rb\_funcall(receiver, mid, argc, arg, arg, ...) > > > > The mid parameter is the ID of the method to invoke (nor its name) and > > the arguments (if any) are VALUEs, > >       \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ > Bergabunglah dengan orang-orang yang berwawasan, di di bidang Anda! Kunjungi Yahoo! Answers saat ini juga di [http://id.answers.yahoo.com/](http://id.answers.yahoo.com/) ---
**Author:** ![Paul\_Brannan](https://avatars.discourse-cdn.com/v4/letter/p/76d3ee/32.png) [@Paul\_Brannan](https://rubytalk.org/u/Paul_Brannan)\ **Post date:** [9 January 2008 15:35 UTC](https://rubytalk.org/t/embedding-1-9/43583/18 "2008-01-09T15:35:59Z")
I submitted a bug for this a while ago: [http://rubyforge.org/tracker/?func=detail&atid=1698&aid=13838&group\_id=426](http://rubyforge.org/tracker/?func=detail&atid=1698&aid=13838&group_id=426) I see no reason for this to be an opaque value. Currently I use the #ifndef trick to get the TAG\_ macros. Paul > **···** > > On Wed, Jan 09, 2008 at 03:03:49AM +0900, Dave Thomas wrote: > > > \> Dave, > > \> Those are defined locally in if\_ruby.c, that seems to be the > > \> convention as the tcltk extension does the same. I wonder if those > > \> should be pushed into ruby.h to ease embedding...? > > > > That'd get my vote. I've copied core on this..