April 2013 - MacRuby-devel - lists.macosforge.org

Pointer to an array of structs?
by John Labovitz 24 Apr '13

24 Apr '13

I just spent a couple of days on figuring out how to properly get a pointer to an array of C-structs. I finally figured it out, but it seems like more work than necessary, and I'm wondering what other folks think. I'm using Harfbuzz, a C library, to do some OpenType text shaping & positioning -- that is, converting a Unicode string, plus a given font, to a sequence of glyphs with positions. In this specific code, I'm trying to convert an array of Ruby strings to 'features,' which are represented in Harfbuzz by the 'hb_feature_t' struct. The function hb_feature_from_string() handles the conversion, but needs a pointer to a pre-allocated 'hb_feature_t' struct. The set of features needs to be stored as an array of contiguous structs, which is then passed into the shaping function hb_shape(). Here are the definitions from the .h files: typedef struct hb_feature_t { hb_tag_t tag; uint32_t value; unsigned int start; unsigned int end; } hb_feature_t; hb_feature_from_string (const char *str, int len, hb_feature_t *feature); hb_shape (hb_font_t *font, hb_buffer_t *buffer, const hb_feature_t *features, unsigned int num_features); I've built a small framework with the Harfbuzz library and the BridgeSupport file that resulted from running gen_bridge_metadata on those .h files. Here are excerpts from my current working MacRuby code. feature_strings = %w{dlig kern} features = feature_strings.map do |feature_string| feature = Pointer.new('{hb_feature_t=IIII}') hb_feature_from_string(feature_string, -1, feature) feature.value end features_ptr = Pointer.new_with_type('^{hb_feature_t=IIII}') features_ptr.assign(features) @features = features_ptr.value @num_features = features.length # ...later on... hb_shape_full((a)font.hb_font, buffer, @features, @num_features) In my first attempts, I tried to allocated a single Pointer object that would contain all the features, and then call hb_feature_from_string() with each element in turn, like this: @features = Pointer.new('{hb_feature_t=IIII}', feature_strings.length) feature_strings.each_with_index do |feature_string, i| hb_feature_from_string(feature_string, -1, @features[i]) end @num_features = feature_strings.length The code ran, but the '@features' pointer remained in the initialized state -- that is, all the values were 0. I tried this in several different ways, and no matter what, the values were never set. This seems like a potential bug. (It also seems odd to need to specify the exact members of the type -- the '=IIII' part -- but MacRuby complained mightily when I removed that part.) Can some Pointer guru take a look at the above and give me a reality check? Is the way I'm doing it just the way it must be done? Or should the second method, with the single Pointer object, actually work? Best, --John

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What's the process for getting a c-extension to install with macgem?
by Josh Voigts 16 Apr '13

16 Apr '13

What's the process for getting a c-extension to compile correctly with macgem? This is related to this github issue: https://github.com/ohler55/ox/issues/55 Below are the results of trying to install an xml parser with macgem. Even when these issues are ignored during compilation, it appears that macruby won't recognize a `require` of the gem. $ sudo macgem install ox Fetching: ox-1.9.4.gem (100%) Building native extensions. This could take a while... ERROR: Error installing ox: ERROR: Failed to build gem native extension. /Library/Frameworks/MacRuby.framework/Versions/0.12/usr/bin/macruby extconf.rb >>>>> Creating Makefile for MacRuby version 1.9.2 on universal-darwin10.0 <<<<< creating Makefile make /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o base64.o -c base64.c /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o cache.o -c cache.c /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o cache8.o -c cache8.c /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o cache8_test.o -c cache8_test.c /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o cache_test.o -c cache_test.c /usr/bin/gcc -I. -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/universal-darwin10.0 -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2/ruby/backward -I/Library/Frameworks/MacRuby.framework/Versions/0.12/usr/include/ruby-1.9.2 -I. -DRUBY_TYPE=MacRuby -DMACRUBY_RUBY -DRUBY_VERSION=1.9.2 -DRUBY_VERSION_MAJOR=1 -DRUBY_VERSION_MINOR=9 -DRUBY_VERSION_MICRO=2 -DHAS_RB_TIME_TIMESPEC=0 -DHAS_TM_GMTOFF=0 -DHAS_ENCODING_SUPPORT=0 -DHAS_PRIVATE_ENCODING=0 -DHAS_NANO_TIME=0 -DHAS_RSTRUCT=0 -DHAS_IVAR_HELPERS=0 -DHAS_PROC_WITH_BLOCK=0 -DHAS_TOP_LEVEL_ST_H=0 -DNEEDS_UIO=1 -Wall -fno-common -arch x86_64 -fexceptions -fno-common -pipe -O3 -g -Wall -arch x86_64 -o dump.o -c dump.c In file included from dump.c:39: ox.h:190: error: expected specifier-qualifier-list before ‘rb_encoding’ dump.c: In function ‘dump_obj’: dump.c:598: warning: initialization discards qualifiers from pointer target type dump.c:838: warning: initialization discards qualifiers from pointer target type dump.c: In function ‘dump_gen_nodes’: dump.c:1108: warning: initialization discards qualifiers from pointer target type make: *** [dump.o] Error 1 Gem files will remain installed in /Library/Ruby/Gems/MacRuby/0.12/gems/ox-1.9.4 for inspection. Results logged to /Library/Ruby/Gems/MacRuby/0.12/gems/ox-1.9.4/ext/ox/gem_make.out

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Admin privileges / Authorization Framework
by Jeff Dyck 09 Apr '13

09 Apr '13

Hey all, I'm desperately hoping for some help here... I'm a System Admin for a School District with thousands of Macs. In the past I developed an AppleScript Studio application that our technicians used to backup and restore user accounts when we do system migrations and image updates (basically rsync with some internal logic to filter out files that might conflict). Anyway, with AppleScript Studio long deprecated, we're starting to see some issues with it running on 10.8, so I've started working on a replacement in MacRuby (which I've started to move to for other development)... I love Ruby vs the pain of AppleScript, especially for things like dealing with xml and whatnot, but I'm running into one HUGE challenge... My app requires admin privileges to backup and restore user accounts and restore permissions. In AppleScript Studio this was relatively simple to do using the "do shell script with admin privs' command. In MacRuby.... I'm stumped. I've dug in a bit into the Authorization framework, and looked at some of Apple's documentation for splitting your app into helper tools... but it's difficult enough to follow the Obj-C stuff, migrating that to Ruby is probably over my head. So long story short, anyone have some samples of how to do this with MacRuby? I'd need to be able to do things like: • Calculate size of folders and count of files in another user account (and get result back) • Send an RSYNC command as admin (and get feedback for calculating progress) Here's hoping someone can point me in the right direction. Thanks in advance. Jeff

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Mac App Store Submission question
by david kramf 03 Apr '13

03 Apr '13

Hi all, in the Mac App Store Submission github page one finds the following paragraph "An example might be something like this:--compile --embed --gem httparty --gem json_pure --codesign "3rd Party Mac Developer Application: Daniel Westendorf". This example will compile your source into .rbo files (instead of .rb files, don't let anyone steal your code!)" What are those .rbo files ? My application is heavily dependent on metaprogramming. Will it work as a compiled .rbo file? Thanks, David Kramf

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