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    Getting the rom name and emulator

    Scheduled Pinned Locked Moved General Discussion and Gaming
    pi model v3pythonscriptretropiesetup
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    • BuZzB
      BuZz administrators @daveyman123
      last edited by

      @daveyman123 https://retropie.org.uk/docs/Runcommand/#runcommand-onstart-and-runcommand-onend-scripts

      To help us help you - please make sure you read the sticky topics before posting - https://retropie.org.uk/forum/topic/3/read-this-first

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        daveyman123 @BuZz
        last edited by

        @buzz said in Getting the rom name and emulator:

        @daveyman123 https://retropie.org.uk/docs/Runcommand/#runcommand-onstart-and-runcommand-onend-scripts

        "Useful data are passed as arguments to these scripts:

        $1 - the system (eg: atari2600, nes, snes, megadrive, fba, etc).
        $2 - the emulator (eg: lr-stella, lr-fceumm, lr-picodrive, pifba, etc).
        $3 - the full path to the rom file.
        $4 - the full command line used to launch the emulator."
        

        would i use subprocess.call within python to call these commands?

        BuZzB 1 Reply Last reply Reply Quote 0
        • BuZzB
          BuZz administrators @daveyman123
          last edited by

          @daveyman123 No - you could call your python script from the bash script passing the arguments in, then when launching a game the code will be called and you can send the game name to your display etc.

          To help us help you - please make sure you read the sticky topics before posting - https://retropie.org.uk/forum/topic/3/read-this-first

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          • D
            daveyman123
            last edited by

            thank you for the replies. very much appreciated :)

            1 Reply Last reply Reply Quote 0
            • D
              daveyman123 @BuZz
              last edited by

              @buzz said in Getting the rom name and emulator:

              @daveyman123 No - you could call your python script from the bash script passing the arguments in, then when launching a game the code will be called and you can send the game name to your display etc.

              OK so i create the bash script and make it executable. inside the script i have given the command "python /path/to/myscript.py"

              I can run the bash script from terminal and it works!

              However,
              when i launch a game the script doesnt run

              again i have put the the python script in the "runcommand-onstart.sh" script and not made the script executable or added anything other than what i mentioned before

              thanks,
              DM123

              BuZzB 1 Reply Last reply Reply Quote 0
              • BuZzB
                BuZz administrators @daveyman123
                last edited by BuZz

                @daveyman123 Where did you put the file ? What version of RetroPie are you running ? Please post the script (use a code block - http://commonmark.org/help/)

                To help us help you - please make sure you read the sticky topics before posting - https://retropie.org.uk/forum/topic/3/read-this-first

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                • D
                  daveyman123 @BuZz
                  last edited by

                  @buzz said in Getting the rom name and emulator:

                  @daveyman123 Where did you put the file ? What version of RetroPie are you running ? Please post the script (use a code block - http://commonmark.org/help/)

                  @buzz said in Getting the rom name and emulator:

                  @daveyman123 Where did you put the file ? What version of RetroPie are you running ? Please post the script (use a code block - http://commonmark.org/help/)

                  damnit all i forgot was to put sudo! :/ its working now!

                  i guess the next question i would ask would be: how do i retrieve the information

                  in the document you provided it says "$1" will get me the emulator. but i am unsure how to use this with python

                  thanks so much for your continued help!
                  DM123

                  BuZzB cyperghostC 2 Replies Last reply Reply Quote 0
                  • BuZzB
                    BuZz administrators @daveyman123
                    last edited by BuZz

                    @daveyman123

                    python /path/to/myscript.py "$@"
                    

                    will pass all the script arguments to your python script.

                    or use

                    python /path/to/myscript.py" "$1"
                    

                    to pass a single parameter for example

                    To help us help you - please make sure you read the sticky topics before posting - https://retropie.org.uk/forum/topic/3/read-this-first

                    cyperghostC 1 Reply Last reply Reply Quote 0
                    • cyperghostC
                      cyperghost @BuZz
                      last edited by

                      @buzz Just a coding question.
                      If I use "$@" is there need to use loops to get all arguments or will all arguments pathed?
                      I used always "$1"... parameters and definated emulator=$1.

                      Can I resolve the $@ command and say emlulator=$1 romname=$2

                      What's is the better method to handle those calls?

                      BuZzB 1 Reply Last reply Reply Quote 0
                      • cyperghostC
                        cyperghost @daveyman123
                        last edited by cyperghost

                        @daveyman123
                        You can look to this >> lfl-launcher.source and see lines 33-37

                        These arguements were created by the bash-file >> create favourties.sh

                        So the bash file (Create Favourites.sh) gives arguments to binary (lfl-launcher) the first command "/home/pi/RetroPie/roms/My Favourites" was given manually.

                        BTW: There is no need to use this binary @pjft did a great job introducing favorites in our Emulations Station :D

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                          daveyman123 @cyperghost
                          last edited by

                          @cyperghost

                          very informative Cyperghost. Thank You. so basically retropie is written in bash or am i way off?

                          BuZzB 1 Reply Last reply Reply Quote 0
                          • BuZzB
                            BuZz administrators @daveyman123
                            last edited by

                            @daveyman123 RetroPie-Setup (the installer script etc) is written in bash and so is the launch script. Components are written in various other languages (C/C++/Python).

                            To help us help you - please make sure you read the sticky topics before posting - https://retropie.org.uk/forum/topic/3/read-this-first

                            1 Reply Last reply Reply Quote 0
                            • BuZzB
                              BuZz administrators @cyperghost
                              last edited by

                              @cyperghost I don't understand your question.

                              To help us help you - please make sure you read the sticky topics before posting - https://retropie.org.uk/forum/topic/3/read-this-first

                              cyperghostC 1 Reply Last reply Reply Quote 0
                              • cyperghostC
                                cyperghost @BuZz
                                last edited by cyperghost

                                @buzz I call a python programm with $@ within runcommand. What will be the result and how does the python script "knows" how many arguments are given.

                                So if
                                $1 - the system (eg: atari2600, nes, snes, megadrive, fba, etc).
                                $2 - the emulator (eg: lr-stella, lr-fceumm, lr-picodrive, pifba, etc).
                                $3 - the full path to the rom file.
                                $4 - the full command line used to launch the emulator

                                can I just use romfile=$3 variable within python and I get my romfile even by using $@?

                                BuZzB meleuM 2 Replies Last reply Reply Quote 0
                                • BuZzB
                                  BuZz administrators @cyperghost
                                  last edited by

                                  @cyperghost "$@" is all the parameters. eg it expands to

                                  "$1" "$2" "$3" (for any parameters that exist) so it will pass all the parameters on to the python script

                                  https://stackoverflow.com/questions/4824590/propagate-all-arguments-in-a-bash-shell-script#4824637

                                  To help us help you - please make sure you read the sticky topics before posting - https://retropie.org.uk/forum/topic/3/read-this-first

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                                  • D
                                    daveyman123 @BuZz
                                    last edited by

                                    @BuZz
                                    @cyperghost
                                    either of you know why i would have to powercycle my entire raspberry pi to get the "Pimoroni Unicorn Hat" to work more than once i.e. it screws up and lighting is random after one scroll through?

                                    BuZzB 1 Reply Last reply Reply Quote 0
                                    • BuZzB
                                      BuZz administrators @daveyman123
                                      last edited by

                                      @daveyman123 no idea.

                                      To help us help you - please make sure you read the sticky topics before posting - https://retropie.org.uk/forum/topic/3/read-this-first

                                      1 Reply Last reply Reply Quote 0
                                      • meleuM
                                        meleu @cyperghost
                                        last edited by meleu

                                        @cyperghost said in Getting the rom name and emulator:

                                        @buzz I call a python programm with $@ within runcommand. What will be the result and how does the python script "knows" how many arguments are given.

                                        So if
                                        $1 - the system (eg: atari2600, nes, snes, megadrive, fba, etc).
                                        $2 - the emulator (eg: lr-stella, lr-fceumm, lr-picodrive, pifba, etc).
                                        $3 - the full path to the rom file.
                                        $4 - the full command line used to launch the emulator

                                        can I just use romfile=$3 variable within python and I get my romfile even by using $@?

                                        I'm not comfortable with python at all, I only learned it to tweak the joy2key tool and never used it again. But I think the answer for your question can be found here: https://docs.python.org/2/library/sys.html#sys.argv

                                        Maybe this example can answer too:

                                        [PROMPT] $ cat args.py 
                                        #!/usr/bin/python
                                        
                                        import sys
                                        
                                        print '\nnumber of arguments:'
                                        print len(sys.argv)
                                        
                                        print '\nhere are the given arguments:'
                                        for arg in sys.argv:
                                            print arg
                                        
                                        print '\nhere is the third argument:'
                                        print sys.argv[3]
                                        
                                        
                                        [PROMPT] $ ./args.py one two three
                                        
                                        number of arguments:
                                        4
                                        
                                        here is the given arguments:
                                        ./args.py
                                        one
                                        two
                                        three
                                        
                                        here is the third argument:
                                        three
                                        
                                        [PROMPT] $ ./args.py catch errors
                                        
                                        number of arguments:
                                        3
                                        
                                        here is the given arguments:
                                        ./args.py
                                        catch
                                        errors
                                        
                                        here is the third argument:
                                        Traceback (most recent call last):
                                          File "./args.py", line 13, in <module>
                                            print sys.argv[3]
                                        IndexError: list index out of range
                                        
                                        • Useful topics
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                                        cyperghostC 1 Reply Last reply Reply Quote 1
                                        • cyperghostC
                                          cyperghost @meleu
                                          last edited by

                                          @meleu That's it
                                          Thank you

                                          D 1 Reply Last reply Reply Quote 0
                                          • D
                                            daveyman123 @cyperghost
                                            last edited by

                                            @cyperghost

                                            Would you know why something about launching a game stops my unicorn hat from functioning?

                                            If I launch a game and immediately back out it will continue to scroll through the rom on the unicorn hat.

                                            However,
                                            if the game actually launches the unicorn hat stops.
                                            would there be something interfering with the PINS from retropie?

                                            I have the python script running in the background but no difference.

                                            cyperghostC 1 Reply Last reply Reply Quote 0
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