# C Extensions not working on Windows XP 64 **URL:** \ **Category:** Ruby\ **Created:** [February 23, 2006, 10:22pm UTC](https://www.ruby-forum.com/t/c-extensions-not-working-on-windows-xp-64/72527 "2006-02-23T22:22:35Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![matt](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a6a055/32.png) [@matt](https://www.ruby-forum.com/u/matt)\ **Post date:** [February 23, 2006, 10:22pm UTC](https://www.ruby-forum.com/t/c-extensions-not-working-on-windows-xp-64/72527/1 "2006-02-23T22:22:35Z")
I can not for the life of me get even the simplest C extension example to load into ruby on Windows XP. The first case I tried actually was the example provided by SWIG (the simple example). It fails with the message runme.rb:3:in `require’: 127: The specified procedure could not be found. - In it\_Example (LoadError) ./Example.dll from runme.rb:3 The example was compiled with the provided MS-VC++ 6 project without error. A dumpbin of example.dll reveals that the symbol Init\_Example is in fact exported. The same error is reported in both ruby 1.6.8 and ruby 1.8.2. This is supposed to work in theory since it’s ‘automatically’ generated by SWIG I then tried to generate my own example based on some tutorials. //--------------------simple.c------------------------------------------------ #include “ruby.h” static VALUE simple\_initialize(VALUE self, int iValue) { rb\_iv\_set(self,"@i",iValue); rb\_iv\_set(self,"@a",rb\_ary\_new()); return self; } static VALUE simple\_get\_i(VALUE self) { return rb\_iv\_get(self,"@i"); } static VALUE simple\_set\_i(VALUE self, int iValue) { return rb\_iv\_set(self,"@i",iValue); } static VALUE simple\_get\_a(VALUE self) { return rb\_iv\_get(self,"@a"); } VALUE csimple; void Init\_simple() { csimple = rb\_define\_class(“simple”,rb\_cObject); rb\_define\_method(csimple,“initialize”,simple\_initialize,1); rb\_define\_method(csimple,“i”, simple\_get\_i, 0); rb\_define\_method(csimple,“i=”, simple\_set\_i, 1); rb\_define\_method(csimple,“a”, simple\_get\_a, 0); } //--------------------------------------------------------------------- #----- simple.rb ------------ require “simple” s = simple.new(123) p s.i p s.a s.i = 456 s.a.push(“Hello”) s.a.push(“World”) p s.a #----------------------------- The compile procedure from MS-VC++ 6 cl /LD /I$(RUBY\_INCLUDE) /O2 simple.c $(RUBY\_LIBPATH)$(RUBY\_LIB) /link /def:simple.def which compiles without error or warning. dumpbin reveals that Dump of file simple.dll File Type: DLL Section contains the following exports for simple.dll ``` 0 characteristics 43FE269D time date stamp Thu Feb 23 16:18:21 2006 0.00 version 1 ordinal base 1 number of functions 1 number of names ordinal hint RVA name 1 0 00001000 Init_simple ``` Summary ``` 4000 .data 1000 .rdata 1000 .reloc 5000 .text ``` However running D:\ruby\>ruby simple.rb ./simple.rb:4: undefined local variable or method `simple' for # (NameError) from simple.rb:2:in`require’ from simple.rb:2 This is the result from running ruby 1.6.8 I might go back and try 1.8.2 again later, but for now I’ll use python. At least SWIG seems to work with it on windows. ---
**Author:** ![matt](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a6a055/32.png) [@matt](https://www.ruby-forum.com/u/matt)\ **Post date:** [February 23, 2006, 10:34pm UTC](https://www.ruby-forum.com/t/c-extensions-not-working-on-windows-xp-64/72527/2 "2006-02-23T22:34:27Z")
On Feb 23, 2006, at 10:22 PM, Matt wrote: > ./simple.rb:4: undefined local variable or method `simple' for # (NameError) from simple.rb:2:in`require’ > from simple.rb:2 Classes must be constant. Try naming your class ``Simple’’. ^ – Daniel ---
**Author:** ![matt](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a6a055/32.png) [@matt](https://www.ruby-forum.com/u/matt)\ **Post date:** [February 23, 2006, 10:37pm UTC](https://www.ruby-forum.com/t/c-extensions-not-working-on-windows-xp-64/72527/3 "2006-02-23T22:37:30Z")
On Feb 23, 2006, at 10:31 PM, Daniel H. wrote: > Classes must be constant That should be ``Class names’’. Sorry for the spam. – Daniel ---
**Author:** ![matt](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a6a055/32.png) [@matt](https://www.ruby-forum.com/u/matt)\ **Post date:** [February 27, 2006, 6:02am UTC](https://www.ruby-forum.com/t/c-extensions-not-working-on-windows-xp-64/72527/4 "2006-02-27T06:02:14Z")
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Matt wrote: > I then tried to generate my own example based on some tutorials. Ack! I see some integers being directly stored into a Ruby VALUE. Remember to cast them properly using INT2NUM() or, if you’re feeling dangerous, INT2FIX(). > static VALUE simple\_initialize(VALUE self, int iValue) > { > rb\_iv\_set(self,"@i",iValue); rb\_iv\_set(self,"@i",INT2NUM(iValue)); > static VALUE simple\_set\_i(VALUE self, int iValue) > { > return rb\_iv\_set(self,"@i",iValue); return rb\_iv\_set(self,"@i",INT2NUM(iValue)); -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFEAoaZmV9O7RYnKMcRAqwGAJ9uJueRap0sIm9OXXZBIzsiyNgiXwCfbK8q V9XrCvKOfONVlVEYJxI1Lk0= =RuMj -----END PGP SIGNATURE-----