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    Newbie question - execute jar file in ruby

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    • TIGT Offline
      TIG Moderator
      last edited by

      I use the UI.openURL() method with 'jar' files... BUT they are written to read their arguments from an 'ini' file written by the Ruby side. That way I can adjust what is read in, and not get tangled in passing data directly...

      If you have to wait until it's done processing... You could have the jar code simply delete its 'ini' file when it's finished doing its main stuff, and use something like
      sleep(0.2);wait=0.0 while File.exist?(inipath) sleep(0.2) wait+=0.2 break if wait >= 60.0 end#while
      where 'inipath' is the path read by the jar and you set wait's 'time-out' to whatever is sensible - here it's 1 minute - this is in case the jar fails and the 'ini' file never gets deleted...

      TIG

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      • Dan RathbunD Offline
        Dan Rathbun
        last edited by

        @niccah said:

        Oh thank you very much. Now, I just get an error like this: "Error: #<Errno::ENOEXEC: Exec format error - Model2GCode.jar",

        try:
        output =java Model2GCode.jar #{ARGSTRING}``

        I'm not here much anymore.

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        • TIGT Offline
          TIG Moderator
          last edited by

          That's almost it... but it needs a -jar flag to execute the .jar file...
          Use Dir.chdir() to the jar file's folder folder then use
          output =java -jar Model2GCode.jar #{ARGSTRING}``
          [Works for me...]

          TIG

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          • Dan RathbunD Offline
            Dan Rathbun
            last edited by

            FYI the switches for java.exe (probably also javaw.exe)

            Usage; java [-options] class [args...]
                       (to execute a class)
               or  java [-options] -jar jarfile [args...]
                       (to execute a jar file)
            
            where options include;
                -client       to select the "client" VM
                -server       to select the "server" VM
                -hotspot      is a synonym for the "client" VM  [deprecated]
                              The default VM is client.
            
                -cp <class search path of directories and zip/jar files>
                -classpath <class search path of directories and zip/jar files>
                              A ; separated list of directories, JAR archives,
                              and ZIP archives to search for class files.
                -D<name>=<value>
                              set a system property
                -verbose[;class|gc|jni]
                              enable verbose output
                -version      print product version and exit
                -version;<value>
                              require the specified version to run
                -showversion  print product version and continue
                -jre-restrict-search | -jre-no-restrict-search
                              include/exclude user private JREs in the version search
                -? -help      print this help message
                -X            print help on non-standard options
                -ea[;<packagename>...|;<classname>]
                -enableassertions[;<packagename>...|;<classname>]
                              enable assertions
                -da[;<packagename>...|;<classname>]
                -disableassertions[;<packagename>...|;<classname>]
                              disable assertions
                -esa | -enablesystemassertions
                              enable system assertions
                -dsa | -disablesystemassertions
                              disable system assertions
                -agentlib;<libname>[=<options>]
                              load native agent library <libname>, e.g. -agentlib;hprof
                                see also, -agentlib;jdwp=help and -agentlib;hprof=help
                -agentpath;<pathname>[=<options>]
                              load native agent library by full pathname
                -javaagent;<jarpath>[=<options>]
                              load Java programming language agent, see java.lang.instrument
            
                -splash;<imagepath>
                              show splash screen with specified image
            

            πŸ’­

            I'm not here much anymore.

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            • N Offline
              niccah
              last edited by

              You are the best!

              With the help of your tips I could solve the "Exec format error"! Thanks your very very much!

              The next problem: πŸ˜†

              I wrote two very easy jar files:

              1th version: just: System.out.println("Hello world!"); => but with the following code, I get a false.

              
              output = nil
              output = `java -jar Model2GCode.jar #{ARGSTRING}`
              result=$?.success?
              
              

              2nd version: Thread.sleep(10000); => I get a false too.

              When I start the jar file outside of sketchup, everything is fine.

              Do you have an idea, what can I do? I'm not sure, if it is an problem of Sketchup, Ruby or Java...

              Thanks you for all your help!

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              • Dan RathbunD Offline
                Dan Rathbun
                last edited by

                $? is nil when Sketchup first starts.
                After a subprocess runs it may be set to a integer value, for the exit status.

                The method name success? is not an instance method of either NilClass nor Integer (nor it's subclasses, such as Fixnum.)

                You should test the output reference (since you first set it to nil, which Ruby will eval as false in a conditional statement.)

                output = nil
                output = `java -jar Model2GCode.jar #{ARGSTRING}`
                if not output
                  if $? != nil || $? != 0
                    puts("The error code returned was; #{$?.to_s}")
                  else
                    puts("No error code was returned.")
                  end
                else
                  # do something with the output string
                end
                
                

                You cannot call Thread.sleep() as it is a private instance method of the Thread class (and raises a NoMethodError exception.)

                Use the global method sleep() (which is inherited from module Kernel,) instead.
                Warning.. using sleep() can cause "whiteout" (Windows can put the SketchUp application into "ghost-window mode".)

                I'm not here much anymore.

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                • N Offline
                  niccah
                  last edited by

                  Thanks Dan Rathbun!!

                  By using your method - I get an empty output.

                  
                  output = nil
                  output = `java -jar Model2GCode.jar #{ARGSTRING}`
                  if not output
                    if $? != nil || $? != 0
                      puts("The error code returned was; #{$?.to_s}")
                    else
                      puts("No error code was returned.")
                    end
                  else
                    UI.messagebox output
                  end
                  
                  

                  I see the UI.messagebox, but it is empty.
                  My Java code is just a

                  System.out.println("Hello world!");
                  

                  As I read in some forums, the "output" of the java application should be the "System.out.println"'s. So, I'm confused, why it doesn't work?!

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                  • Dan RathbunD Offline
                    Dan Rathbun
                    last edited by

                    Yes I tried it also, and got no output.
                    I tried in in a command shell and got java errors.

                    Sorry I cannot help you with java.

                    Why use java when SketchUp uses Ruby ??

                    I'm not here much anymore.

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                    • TIGT Offline
                      TIG Moderator
                      last edited by

                      Java won't print to the Ruby/SUp messagebox how does it know it.
                      Use an Alert in the Java code...
                      http://www.java2s.com/Code/JavaAPI/javax.microedition.lcdui/Alert.htm

                      TIG

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                      • N Offline
                        niccah
                        last edited by

                        @dan rathbun said:

                        Yes I tried it also, and got no output.
                        I tried in in a command shell and got java errors.

                        Sorry I cannot help you with java.

                        Why use java when SketchUp uses Ruby ??

                        I'm coding a plugin for Sketchup to get a GCode for a CNC milling maschine for a 3D Model. So, multithreading would be very nice to accelerate the calculating. The ruby version of Sketchup doesn't support something like that. So I try to use an external Java application for the main calculations.

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                        • Dan RathbunD Offline
                          Dan Rathbun
                          last edited by

                          Hmmm... OK. Yes, actually it's Ruby 1.8.x itself that uses "green threads" instead of native threads.

                          You might have more luck using a OLE interface to the java.

                          See: [Plugin Library] Win32API and Win32OLE so files
                          and: WIN32OLE rdoc

                          I'm not here much anymore.

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