Hi,
I am trying to extend Ruby and my current implementation is using C++
and Rice (http://rice.rubyforge.org/main.html).
Mac OS X 10.5.8
Ruby 1.8.6 (2008-08-11 patchlevel 287) [universal-darwin9.0]
I have completed the following steps as shown in Rice to create a cpp
class (my_test.cpp)
#include “rice/Class.hpp”
#include “rice/Data_Type.hpp”
#include “rice/Constructor.hpp”
#include “MyTest.h”
using namespace Rice;
extern “C”
void Init_my_test()
{
define_class(“MyTest”).
define_constructor(Constructor()).
define_method(“read”, &MyTest::read);
}
Here are my h and cpp files for MyTest
*** HEADER FILE ***
#ifndef __MyTest_h
#define __MyTest_h
#include
#include “XternalDebug.hpp”
class MyTest
{
public:
MyTest() {};
virtual ~MyTest(void){
SX::Terminate();
SXMP::Terminate();
}
std::string read(std::string filename);
};
#endif
*** CPP FILE ***
#include “MyTest.h”
extern “C” std::string MyTest::read(std::string filename)
{
if(SXMP::Initialize())
{
// Must initialize SX before we use it
if (SX::Initialize())
{
std::string status = “”;
bool ok;
SX myFile;
myFile.OpenFile(filename, UnknownFile, opts);
std::string buffer;
myFile.Get(&buffer);
return buffer;
}
}
return NULL;
}
SX and SXMP are taken from another library called libXternalDebug.a
My extconf.rb file looks as follows:
require ‘rubygems’
require ‘mkmf-rice’
$CPPFLAGS << ’ -DMAC_ENV=1’
have_library(“stdc++”)
dir_config(“xtoolkit”)
have_library(“XternalDebug”)
create_makefile(“my_test”)
I pass the following arguments to extconf.rb
ARCHFLAGS=“-arch i386” ruby extconf.rb
–with-xtoolkit-include=/Users//xtoolkit/public/include
–with-xtoolkit-lib=/Users//xtoolkit/public/libraries
$ ARCHFLAGS=“-arch i386” ruby extconf.rb
–with-xtoolkit-include=/Users//xtoolkit/public/include
–with-xtoolkit-lib=/Users//xtoolkit/public/libraries
checking for main() in -lrice… yes
checking for main() in -lstdc++… yes
checking for main() in -lX… yes
creating Makefile
I then run make:
$ makeg++ -I. -I.
-I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin9.0
-I. -I/Users//xtoolkit/public/include
-I/Library/Ruby/Gems/1.8/gems/rice-1.3.1/ruby/lib/include -DMAC_ENV=1
-fno-common -arch i386 -Os -pipe -fno-common -Wall -g -c my_test.cpp
g++ -I. -I.
-I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin9.0
-I. -I/Users//xtoolkit/public/include
-I/Library/Ruby/Gems/1.8/gems/rice-1.3.1/ruby/lib/include -DMAC_ENV=1
-fno-common -arch i386 -Os -pipe -fno-common -Wall -g -c MyTest.cpp
g++ -arch i386 -pipe -bundle -undefined dynamic_lookup -o my_test.bundle
my_test.o MyTest.o -L.
-L/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib
-L/Users//xtoolkit/public/libraries -L. -arch i386
-L/Library/Ruby/Gems/1.8/gems/rice-1.3.1/ruby/lib/lib -lXternalDebug
-lstdc++ -lrice -lruby -lpthread -ldl -lm
(please note i have removed my username intentionally from the above
paths)
I then have the following ruby test:
require ‘my_test’
require ‘test/unit’
class TestTest < Test::Unit::TestCase
def test_test
t = MyTest.new
assert_equal(Object, MyTest.superclass)
assert_equal(MyTest, t.class)
end
end
When I try to run this I get the following error:
$ ruby testtest.rb
Loaded suite testtest
Started
.
Finished in 0.000476 seconds.
1 tests, 2 assertions, 0 failures, 0 errors
dyld: lazy symbol binding failed: Symbol not found:
__ZN9TSXMISsE9TerminateEv
Referenced from: /Users//tests/rice_test2/my_test.bundle
Expected in: dynamic lookup
dyld: Symbol not found: __ZN9TSXISsE9TerminateEv
Referenced from: /Users//tests/rice_test2/my_test.bundle
Expected in: dynamic lookup
Trace/BPT trap
The above does show the 2 tests as passing but then I get the error
below when it is deconstructing the class at it uses the external
library.
Does anyone know what I am doing wrong or what I am missing to get these
errors? Do I need to include this external library in a particular
directory for ruby to discover?
Any help is much appreciated.
I have also heard of using a combination of FFI and SWIG but how does
this work when it is an external library and I do not have the source?
Lea