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    Function causes a crash

    Bug Reporting (FUZE 4 Nintendo Switch)
    crash bug function
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    • Hector1945
      Hector1945 F @DaddyJDM last edited by

      @DaddyJDM I get an error for attempting to index non array type

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      • spikey
        spikey F @Hector1945 last edited by spikey

        @Hector1945 wow, the response time is quite fast here 😄 @Gothon +1, @DaddyJDM +1 even go with:

        trail[0]=[] //the first time
        trail[0][0]={} //the first time
        trail[0][0].x=ball.x
        trail[0][0].y=ball.y
        
        Hector1945 1 Reply Last reply Reply Quote 2
        • Hector1945
          Hector1945 F @spikey last edited by

          @spikey Why do I get a "unrecognized type: 4" on the line 79 ?

          spikey 1 Reply Last reply Reply Quote 0
          • Gothon
            Gothon F @Hector1945 last edited by Gothon

            There is actually another caveat. If len(trail) is 1, the loop will become for i = 0 to 0 flipping to positive direction and not iterate. There are a couple ways of avoiding this problem. You can write a while loop or use

            for j = 0 to len(trail) loop
                i = len(trail) - 1 - j
            

            Though I notice that your loop uses both trail[i] and trail[i+1], so you probably need to write it as:

            for j = 0 to len(trail)-1 loop
                i = len(trail) - 2 - j
                ...
            repeat
            

            so that it loops len(trail)-2 through 0 since anything outside that range will give you an out of bounds array index.

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            • Hector1945
              Hector1945 F last edited by

              So I tried replacing

              for i = len(trail)-1 to -1 step -1 loop
              

              with

              for i = len(trail)-1 to 0 loop
              

              and starting the game with 2 values already in the array, and the trail works, but I still get the crash...

              Gothon 1 Reply Last reply Reply Quote 0
              • Gothon
                Gothon F @Hector1945 last edited by Gothon

                @Hector1945 said in Function causes a crash:

                but I still get the crash...

                Right the first value of i is len(trail)-1 = 1 and i+1 = 2 which is out of bounds for an array of size 2 (the valid indices are 0, 1). Since you are writing trail[i+1], you need to start the loop with for i = len(trail)-2 ....

                Hector1945 1 Reply Last reply Reply Quote 0
                • PickleCatStars
                  PickleCatStars F last edited by

                  I had ’unrecognised type’ error before when accessing an array. Martin said to change the iterator Name to something unique (the ’x’ in ’for x = 0 to..’), and that worked. It was a fuze bug, not something I’d done that time...

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                  • Hector1945
                    Hector1945 F @Gothon last edited by

                    @Gothon Wouldn't I get an error if it was out of bounds ? Because the crash only occurs like 20 seconds in the game, way after the array gets completely filled with 50 values...

                    Gothon 1 Reply Last reply Reply Quote 0
                    • Gothon
                      Gothon F @Hector1945 last edited by

                      @Hector1945 I agree that Fuze should give you an out of bounds error, but when Fuze itself is crashing it is difficult to know what to expect. It can be tricky to trace back to the cause of undefined behaviors.

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                      • Hector1945
                        Hector1945 F last edited by

                        If I do the len(trail)-2 it does not crash but the trail doesn't display properly

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                        • Hector1945
                          Hector1945 F last edited by

                          Oh ok it just didn't execute the command because len(trail)-2 = 0 if trail has 2 values

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                          • spikey
                            spikey F @Hector1945 last edited by

                            @Hector1945 Glad you solved it , the unrecognized type 4 error probably went from adding a value to a not properly initialized array (or reading from a such). (Because of wrong dimension, index). Is it technically a 'void' type? What means its just pointing to a place in memory, but its not clear yet, what the bytes mean there: number, string, array. If somebody knows for sure please comment on this. It would be nice to know for sure.

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                            • Hector1945
                              Hector1945 F last edited by

                              Oh no it isn't solved ! I now have a lead though, because apparently it does come from the trail[0] = [{ball.x,ball.y},moving] because if I replace that line by trail[0] = 5 or any random int, then it doesn't crash ! I just don't know how to solve it, because when I try I get an unrecognised type 4 error.

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                              • spikey
                                spikey F last edited by spikey

                                Ok, is moving a global variable? To test if this is the problem, add a line before:
                                moving = false
                                Which will make sure it is declared implicitly as a boolean and defined as false.

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                                • Hector1945
                                  Hector1945 F last edited by

                                  I tried, and it still crashes.

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                                  • vinicity
                                    vinicity F last edited by vinicity

                                    What is trail[0] = [{ball.x,ball.y},moving] supposed to accomplish anyway?

                                    It looks like you are assigning an array containing a vector and something else to trail[0]?

                                    And then you treat the result as an int?

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                                    • Hector1945
                                      Hector1945 F last edited by

                                      No I treat the result as an array of a vector and a boolean. The vector is used to log the 50 most recent positions of the ball, in order to make a trail that follows the exact path of the ball, like in the reference video. The "moving" boolean is used to determine if a trail should actually be drawn to that point. There might be a better way of doing this, but I haven't figured it out.

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                                      • vinicity
                                        vinicity F last edited by

                                        Sorry, I didn’t read the code properly. Now I see how you do it.

                                        Not sure if it would help, but maybe using a struct would be better and then having an array of structs instead?

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                                        • vinicity
                                          vinicity F last edited by vinicity

                                          Did you change the loop? Backwards loops in Fuze do not work as one would suspect.

                                          I find it is always better to use a while loop instead and handling the counter yourself in those cases.

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                                          • Hector1945
                                            Hector1945 F last edited by

                                            You mean making a for() loop as a while() ?

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