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[Tutorial] SketchUp Ruby C Extension

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  • T Offline
    thomthom
    last edited by 6 Nov 2011, 14:04

    Think I got one step further. This thread mentions that vcvars32.bat needs to be run from the prompt: http://social.msdn.microsoft.com/Forums/en-US/Vsexpressvc/thread/325b5459-c469-40d0-bf6d-e3356a2f14cd/

    And this (http://stackoverflow.com/questions/6622869/problem-with-nmake )

    So after I did that I got a different error. Missing crt file...


    Build Error 02.png

    Thomas Thomassen β€” SketchUp Monkey & Coding addict
    List of my plugins and link to the CookieWare fund

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    • T Offline
      thomthom
      last edited by 6 Nov 2011, 14:08

      ( Apologies for those with the know-how - I will be posting lots of silly stuff as I work through this. Posting to make a record of what I am doing. "Thinking out loud". )

      Thomas Thomassen β€” SketchUp Monkey & Coding addict
      List of my plugins and link to the CookieWare fund

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      • T Offline
        thomthom
        last edited by 6 Nov 2011, 14:36

        Got it working!

        Uncommented a #pragma comment(lib, "crt.lib"); I had. TBD's SUExt project had a reference to it. Which is what I based my project on. Seeing how it also referred to #pragma comment(lib, "msvcrt-ruby18.lib"); I just tried to see what happened if I removed the ref to crt.lib. Everything worked fine after that point.

        Now I wonder what the other lines do:

        #pragma comment(lib, "kernel32.lib") #pragma comment(lib, "gdi32.lib") #pragma comment(lib, "user32.lib") #pragma comment(lib, "shell32.lib")

        I'm looking at this tutorial: http://blogs.law.harvard.edu/hoanga/2006/12/14/getting-a-ruby-c-extension-to-compile-on-windows/
        It made no reference to any of this. ( what is it? Is it really required? )

        I'm guessing #include <windows.h> is required though.

        Thomas Thomassen β€” SketchUp Monkey & Coding addict
        List of my plugins and link to the CookieWare fund

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        • T Offline
          thomthom
          last edited by 6 Nov 2011, 14:38

          Now... I'd like to find a way to make any output from extconf.rb and make/nmake put everything is a separate directory - for each platform.

          Thomas Thomassen β€” SketchUp Monkey & Coding addict
          List of my plugins and link to the CookieWare fund

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          • T Offline
            thomthom
            last edited by 6 Nov 2011, 15:02

            Huh... I removed all of that stuff completely, as http://blogs.law.harvard.edu/hoanga/2006/12/14/getting-a-ruby-c-extension-to-compile-on-windows/ made no reference to it at all. Worked fine without. Guess it was required due to the way the Pelles C project was set up... ❓

            Thomas Thomassen β€” SketchUp Monkey & Coding addict
            List of my plugins and link to the CookieWare fund

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            • T Offline
              thomthom
              last edited by 6 Nov 2011, 15:46

              Hey Chris, when we get around to writing up the step by step instructions, are you willing to be a guinea pig?

              Thomas Thomassen β€” SketchUp Monkey & Coding addict
              List of my plugins and link to the CookieWare fund

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              • C Offline
                Chris Fullmer
                last edited by 6 Nov 2011, 21:25

                Absolutely!

                Lately you've been tan, suspicious for the winter.
                All my Plugins I've written

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                • T Offline
                  thomthom
                  last edited by 6 Nov 2011, 22:37

                  Great!

                  I'm writing up a Basic example that shows a little more than Hello World.

                  Then I start on making the step by step Wiki tutorial. I hope people with more know how can fill the in the "why" to much of it. And that people will try it and give feedback on what is unclear and what turns out not to work.

                  Thomas Thomassen β€” SketchUp Monkey & Coding addict
                  List of my plugins and link to the CookieWare fund

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                  • D Offline
                    Dan Rathbun
                    last edited by 7 Nov 2011, 04:02

                    @thomthom said:

                    Though I have a suspicion I need to specify the path to where windows.h is located... Though I don't know where to do so...

                    To do so via the IDE... from the menu Tools > Options...

                    .. brings up the "Options" dialog.
                    Choose "VC++ Directories" from the "Projects and Solutions" branch in the nav tree.
                    You can see the dirs for catagories by selecting the cat from the "Show directories for:" dropdown control:

                    Executable files:
                    VCpp_opts_exe.png

                    Include files:
                    VCpp_opts_inc.png

                    I'm not here much anymore.

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                    • D Offline
                      Dan Rathbun
                      last edited by 7 Nov 2011, 04:10

                      Don't forget the "help" topic here:
                      [Info] C/C++ Ruby extensions & SketchUp plugins
                      .. and read Adan Nelson's posts (links on the above list.)

                      I'm not here much anymore.

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                      • D Offline
                        Dan Rathbun
                        last edited by 8 Nov 2011, 22:37

                        from the info file "win32.readme" in the Ruby C source:
                        @unknownuser said:

                        You can NOT use a path name [that] contains any white space characters as
                        the ruby source directory, this restriction comes from the behavior of include directives of NMAKE.
                        (- you may call it a bug. -)

                        I'm not here much anymore.

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                        • T Offline
                          tbd
                          last edited by 9 Nov 2011, 07:31

                          Thom: #pragma comment(lib, "*.lib") adds the libraries to the link phase (that hold imports and functions code)

                          it was a way to make sure that it will compile even if you create a new project and don't use in mine in PellesC.

                          SketchUp Ruby Consultant | Podium 1.x developer
                          http://plugins.ro

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                          • T Offline
                            thomthom
                            last edited by 9 Nov 2011, 07:36

                            Right'o! Gotcha. Been reading more up on C and GCC.

                            Thomas Thomassen β€” SketchUp Monkey & Coding addict
                            List of my plugins and link to the CookieWare fund

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                            • T Offline
                              tomasz
                              last edited by 9 Nov 2011, 13:44

                              Thanks Thomas for the example.

                              I do not understand what is 'extconf.rb' for. I have compiled my extension under VC++ 2008 without running the file and without using any makefile... Is it bad ? πŸ˜• πŸ’š

                              Author of [Thea Render for SketchUp](http://www.thearender.com/sketchup)

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                              • T Offline
                                tbd
                                last edited by 9 Nov 2011, 14:02

                                extconf.rb - external configuration, it generates the makefile to create the extension. using makefile you can automate builds and tests.

                                SketchUp Ruby Consultant | Podium 1.x developer
                                http://plugins.ro

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                                • T Offline
                                  thomthom
                                  last edited by 9 Nov 2011, 14:04

                                  extconf.rb generates a make file you can use with make under OSX and nmake under Windows.
                                  http://ruby-doc.org/docs/ProgrammingRuby/html/ext_ruby.html#UG

                                  Thomas Thomassen β€” SketchUp Monkey & Coding addict
                                  List of my plugins and link to the CookieWare fund

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                                  • T Offline
                                    thomthom
                                    last edited by 9 Nov 2011, 14:05

                                    @unknownuser said:

                                    I have compiled my extension under VC++ 2008

                                    How big difference is making a Ruby Extension in C++ as oppose to C? ...seeing how Ruby is built in C... ❓

                                    Thomas Thomassen β€” SketchUp Monkey & Coding addict
                                    List of my plugins and link to the CookieWare fund

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                                    • T Offline
                                      tomasz
                                      last edited by 9 Nov 2011, 14:18

                                      @unknownuser said:

                                      extconf.rb - external configuration, it generates the makefile to create the extension. using makefile you can automate builds and tests.

                                      Got it! In VC++ I have to configure it on my own.

                                      @thomthom said:

                                      How big difference is making a Ruby Extension in C++ as oppose to C? ...seeing how Ruby is built in C... ❓

                                      You certainly would need to enclose declaration of the extension initialization with extern "C":

                                      extern "C" {
                                      void Init_SX_HelloWorld(); 
                                      }
                                      

                                      I am not really an expert, but I guess all the rest would stay same.

                                      Author of [Thea Render for SketchUp](http://www.thearender.com/sketchup)

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                                      • T Offline
                                        thomthom
                                        last edited by 12 Nov 2011, 23:48

                                        Added a new example with basic functions. Will start on the tutorial text and images next.

                                        Btw, does anyone know how one can make extconf.rb and make/nmake output their files to a given folder? I'd like to make it so that each platform outputs its generated files to separate directories.

                                        Thomas Thomassen β€” SketchUp Monkey & Coding addict
                                        List of my plugins and link to the CookieWare fund

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                                        • C Offline
                                          Chris Fullmer
                                          last edited by 12 Nov 2011, 23:53

                                          What C++ compiler or development environment are you going to write this for so I can go download it and start poking around in it?

                                          Lately you've been tan, suspicious for the winter.
                                          All my Plugins I've written

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