I'm probably too late to help, but in the chance that it helps anyone else
who stumbles across this post, the problem here is that you are using
sys.stdin.readlines() in your ReadSTDIn() function. This function will (by
design) block the python thread until it receives an end-of-file signal
from Node.js via the blend.stdin.end() function call at the end of your
sample javascript code. If you want your code to be able to send, process,
repeat indefinitely, you will need to use sys.stdin.readline() (without the
's') or just sys.stdin.read(). In either case, you will need to implement
some mechanism to signal to your python code when to pause reading and
process each message (e.g. a sentinel.)
On Tuesday, June 27, 2017 at 10:55:26 AM UTC-8, Daniel Scutt wrote:
>
> I'm not sure where the issue lies. I'm attempting to run a packaged
> Blender game as a Node child process. I use the stdin and stdout streams to
> communicate between the two. I've tested it already, and have verified I
> can send data to and receive data from the Blender game. However, I must
> call stdin.end() after the initial message is sent, otherwise the program
> hangs. But if I call stdin.end(), I end that stream and can no longer
> communicate between the Node process and the game. I intend to do most of
> my scripting in Javascript, and might ultimately pick up Unity over
> Blender. I've been using Blender for a number of years, so it's really just
> old-dog mentality that's keeping me from making the move. But I'm not sure
> that would solve my issue anyway.
>
> This is the script I use to spawn the Blender game, and send a message to
> the game (I copied this from an example on Stack Exchange).
>
>
> //start.js
> var spawn = require('child_process').spawn,
> blend = spawn('test.exe', []),
> data = [1,2,3,4,5,6,7,8,9],
> dataString = '';
> blend.stdout.on('data', function(data){
> dataString += data.toString();
> });
> blend.stdout.on('end', function(){
> console.log('Sum of numbers=',dataString);
> });
> blend.stdin.write(JSON.stringify(data));
> blend.stdin.end();
>
>
> This is the script I use in the Blender game, in conjunction with the
> above (also copied, and modified, from the Stack Exchange example).
>
>
> import bge
> import sys, json
> import select
> cont = bge.logic.getCurrentController()
> own = cont.owner
> """
> Client Data Handling
> """
> def ReadSTDIn():
> data = []
> if select.select([sys.stdin,],[],[],0.0)[0]:
> lines = sys.stdin.readlines()
> if len(lines) >= 1:
> for line in json.loads(lines[0]):
> data.append(line)
> return data
> def SendSTDOut(data):
> print(data+"\n")
> return 1
> def DataHandler():
> lines = ReadSTDIn()
> send = ""
> for line in lines:
> if line == "test":
> send = "test sat"
> SendSTDOut(send)
> return 1
>
> """
> Logic Interval Stuff
> """
> def GetLocation():
> wp = own.worldPodition()
> for coord in wp:
> SendSTDOut(coord)
> def Interval():
> GetLocation()
> return 1
>
> def Main():
> DataHandler()
> Interval()
> return 1
> Main()
>
>
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