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    [Tutorial] SketchUp Ruby C Extension

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    • thomthomT Offline
      thomthom
      last edited by

      @jefftrull said:

      Let's see how this works for people. Tested only under Windows, although I tried to make the analogous changes for OSX based on my reading of extconf.rb. This file is intended to live under "src" and will create targets for both extensions.

      Sorry, haven't had time to look at this yet. I've got quite a list of things to do for the time being... 😞

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

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      • C Offline
        chyn2000
        last edited by

        Hey guys,

        So, I got the ruby extension process to work, but I seem to be running into one little catch... multithreading.

        FYI: I'm using Pelle's C with the options TBD suggested in his SUExt example. I'm on a Win 7 (64 bit) system (though hopefully that won't matter).

        I'm trying to use _beginthread, but using TBD's settings, it seems I have an unresolved symbol '_beginthread'.

        Just to let you know, I am kind of new to multithreading and DLLs. I have created threaded applications, but never a threaded dll.

        Taking an example program that I have gotten to compile and run as a standalone app (pelle's C option multithreaded (lib)), I add the libs, includes and functions required to make it a ruby extension and it suddenly can't resolve _beginthread.

        A couple of modifications to TBD's project settings and I get it to compile and even be recognized by the irb. However, it seems the second the thread tries to run, the whole irb closes.

        The settings I modified to "get it to work" was:
        Runtime library from multithread (dll) to multithread (lib)
        and turn off "Omit default library in object files"

        Any ideas?

        Thanks,
        Reg

        
        // general Windows
        #pragma comment(lib, "kernel32.lib")
        #pragma comment(lib, "gdi32.lib")
        #pragma comment(lib, "user32.lib")
        #pragma comment(lib, "shell32.lib")
        #pragma comment(lib, "advapi32.lib")
        
        // Ruby
        #define HAVE_ISINF 1  // isinf macro redefinition workaround
        #pragma comment(lib, "msvcrt-ruby18.lib");
        
        // DLL
        #pragma comment(lib, "crt.lib");
        
        #include <stdio.h>
        #include <windows.h>
        #include <process.h>         // needed for _beginthread()
         
        // Ruby headers 
        #include "ruby.h"
        
        void  silly( void * );       // function prototype
        
        // De fining a space for information and references about the module to be stored internally
        VALUE KMRH = Qnil;
        
        int j = -1;
        
        // our function
        VALUE method_display_model(VALUE self, VALUE input)
        {
            // Our program's first thread starts in the main function.
            printf( "Now in the main function.\n" );
        
            // Let's now create our second thread and ask it to start
            // in the silly() function.
        //    _beginthread( silly, 0, (void*)12 );  //Commented out to see if the program would stay alive and it does
        
            // From here on there are two separate threads executing
            // our one program.
        
            // This main thread can call the silly() function if it wants to.
        	while(j != 0)
        	{
            	silly( (void*)j );
        		j--;
        	}
        
            Sleep( 10000 );
        
        	int i = NUM2INT(input);
        	return INT2NUM(i + 1);
        }
        
        // The initialization method for this module
        void Init_KMRH(void)
        {
        	KMRH = rb_define_class("KMRH", rb_cObject);
        	rb_define_method(KMRH, "display", method_display_model, 1);
        }
        
        
        void  silly( void *arg )
        {
        	int k = 10;
        	while(k-- != 0)
        	{
        //    	printf( "The silly() function was passed %d\n", (INT_PTR)arg );
            	printf( "The silly() function was passed %d\n", k );
        	}
        }
        
        
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        • thomthomT Offline
          thomthom
          last edited by

          That's way beyond me. I've not dealt with threading at all. But I'll be keeping an eye on this as it something I might want to do in the future.

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

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          • C Offline
            chyn2000
            last edited by

            So, I have to apologize for wasting your time...

            First thing I need to do (yet again) is RTFM.

            The answer to threading is incredibly simple:
            _beginthread( silly, 0, (void*)12 );

            becomes

            rb_thread_create( silly, (void*)12);

            found it on:
            http://ruby-doc.org/docs/ProgrammingRuby/html/ext_ruby.html

            So, if you will excuse me, I need to go beat myself half to death...

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            • thomthomT Offline
              thomthom
              last edited by

              You will not get any joy from using Ruby threads. They are "green" threads. It's just Ruby dividing up the tasks itself - not the system. So making a thread in Ruby will not prevent SU from freezing.

              Link Preview Image
              Parallelism is a Myth in Ruby - igvita.com

              favicon

              (www.igvita.com)

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

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              • Dan RathbunD Offline
                Dan Rathbun
                last edited by

                And Daniel Berger's win32-thread package that wraps native threads is still Alpha and unstable (AFAIK.)

                I'm not here much anymore.

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                • J Offline
                  jefftrull
                  last edited by

                  I'm on to the next challenge now... building for the 1.8.7-p334 version my colleagues prefer (better compatibility with certain gems). Unfortunately this one was built with with mingw, and my VS2010 build flow that worked for 1.8.6-p287 (mswin) is not successful here. I have the following results:

                  1. build against 1.8.7-p334 built from source with VS2010: compile succeeds, load fails with missing dll msvcrt-ruby18-vc100 (or something like that). If I supply the dll, Sketchup crashes.
                  2. build against 1.8.7-p334 one-click install (mingw): compile fails. Lots of warnings about win32.h and missing ruby API functions
                  3. hybrid build pointing includes to mswin build of 1.8.7-p334, library from mingw one-click: link error

                  I'm under the impression that because dll's use the C API it should be possible to load a VS2010-generated extension into a mingw-built Ruby. Is it a hopeless cause?

                  Thanks,
                  Jeff

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                  • J Offline
                    jefftrull
                    last edited by

                    Today I made a startling discovery: the plugin I built under VS2010 against the 1.8.6-p287 mswin Ruby will load and run without changes in the 1.8.7-p334 mingw build. So the Ruby version and compiler both mismatch, and yet everything works. I'm dumbfounded but delighted, and my previous question is now moot.

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                    • thomthomT Offline
                      thomthom
                      last edited by

                      πŸ‘ πŸ˜„

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

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                      • thomthomT Offline
                        thomthom
                        last edited by

                        @thomthom said:

                        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.

                        Anyone know how to achieve this?

                        Making it so that when I build and compile under Windows everything is placed in a "win32" folder and "osx" when using OSX?
                        Or rather, to clarify, I know how to do conditionals - just don't know how to control where the generated files are output.

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

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                        • Dan RathbunD Offline
                          Dan Rathbun
                          last edited by

                          and you are compiling from the commandline, not from within the Visual Studio GUI interface, correct ?

                          I'm not here much anymore.

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                          • thomthomT Offline
                            thomthom
                            last edited by

                            Currently using nmake that comes with MS VS C++.

                            And I'm using a extconf.rb with mkfm to generate the makefile.

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

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                            • thomthomT Offline
                              thomthom
                              last edited by

                              Is it possible to build an Ruby C Extension under Windows that doesn't require additional libraries? When using Visual C++ to build the extensions require the C++ runtime library.

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

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                              • tbdT Offline
                                tbd
                                last edited by

                                yes. my old example did that. best is to check the DLL imports section to see what functions it requires

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

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                                • thomthomT Offline
                                  thomthom
                                  last edited by

                                  @unknownuser said:

                                  yes. my old example did that. best is to check the DLL imports section to see what functions it requires
                                  Ah, the Pelles C project! Is it possible to use to to just compile the C source without creating a project? (just trying to find a solution without creating too many extra project files.)

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

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                                  • tbdT Offline
                                    tbd
                                    last edited by

                                    @unknownuser said:

                                    Is it possible to use to to just compile the C source without creating a project? (just trying to find a solution without creating too many extra project files

                                    the .ppj file is just a collection of commands. you can easily convert it to a .bat file if you dont want to have extra files (remember to create the .def file for the .dll link)

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

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                                    • thomthomT Offline
                                      thomthom
                                      last edited by

                                      Do you remember the cause of the C:\ruby\src\ruby-1.8.6-p111\missing.h(71): error #1050: Redefinition of macro 'isinf'. error? And can you explain what your workaround actually do?

                                      Trying to set up a project myself so I actually understand this.

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

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                                      • thomthomT Offline
                                        thomthom
                                        last edited by

                                        And why is the macro redefinition just a warning for this guy, but an error in Pelles C?
                                        https://github.com/barrie0482/rrdruby_win32_build/wiki

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

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                                        • thomthomT Offline
                                          thomthom
                                          last edited by

                                          hm... there is an msvcrt-ruby18.dll in the SketchUp folder - can I make my Visual Studio C++ project rely on this instead? So when the C Extension loads under SketchUp Ruby the runtime is there - installed by SketchUp. ??

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

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                                          • thomthomT Offline
                                            thomthom
                                            last edited by

                                            @unknownuser said:

                                            @unknownuser said:

                                            And can you explain what your workaround actually do?

                                            isinf is already defined in PellesC libraries so there is no need to include that file again.

                                            But I am not including it myself - it's an error that comes from the Ruby missing.h file... :S

                                            
                                            Building hello_world.obj.
                                            Use <stdlib.h> instead of non-standard <malloc.h>
                                            C;\ruby\src\ruby-1.8.6-p111\missing.h(71); error #1050; Redefinition of macro 'isinf'.
                                            *** Error code; 1 ***
                                            Done.
                                            
                                            

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

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