spawn

问题 I have a some Python code that occasionally needs to span a new process to run a shell script in a "fire and forget" manner, i.e. without blocking. The shell script will not communicate with the original Python code and will in fact probably terminate the calling Python process, so the launched shell script cannot be a child process of the calling Python process. I need it to be launched as an independent process. In other words, let's say I have mycode.py and that launches script.sh. Then

问题 I'm trying to get spawn to effect an rm -rf node_modules followed by npm install (on windows 7; n x commands courtesy of a transparently installed CygWin. All n x commands resolve on a commandline just fine). I initially had this using exec , but wanted to catch the stdout/stderr information as it occurred, so I figured I'd use spawn , and rewrote the code to use that. However, that breaks everything. The rm command, rewritten, became this: var spawn = require("child_process").spawn, child =

问题 Get this error in windows cmd when I try to build (emulate) Cordova app. D:\dev\Cordova\toDoList>cordova build android Running command: D:\dev\Cordova\toDoList\platforms\android\cordova\build.bat events.js:85 throw er; // Unhandled 'error' event ^ Error: spawn cmd ENOENT at exports._errnoException (util.js:746:11) at Process.ChildProcess._handle.onexit (child_process.js:1046:32) at child_process.js:1137:20 at process._tickCallback (node.js:355:11) ERROR building one of the platforms: Error: D

问题 I am checking for USB drive removal on linux. I am simply monitoring the output of a command line process with child_process.spawn. But for some reason the child's stdout data event doesn't emit until like 20 lines have been printed, which makes it unable to detect a removed drive. After removing the drive many times, it does finally go. But obviously that won't do. Original: var udevmonitor = require("child_process").spawn("udevadm", ["monitor", "--udev"]); udevmonitor.stdout.on("data",

问题 so I was wondering if there was a way to make a spawned object gradually moves/go faster after the player (you the user) collects 10 points. And faster when the player collects another 10 points and so on and so on? This is my movement script attach to my objects that get spawned in: public class Movement : MonoBehaviour { public static int movespeed = 20; public Vector3 userDirection = Vector3.right; public void Update() { transform.Translate(userDirection * movespeed * Time.deltaTime); } }

问题 I am using the glib vala function glib.process.spawn_async_with_pipes()(http://references.valadoc.org/#!api=glib-2.0/GLib.Process.spawn_async_with_pipes), which outputs some ints corresponding to stdin, stdout, and stderr. How would I use these pipes in Vala? 回答1: Modified example which also writes stuff to stdin: private static bool process_line (IOChannel channel, IOCondition condition, string stream_name) { if (condition == IOCondition.HUP) { stdout.printf ("%s: The fd has been closed.\n",

问题 I'm testing on nodejs child_process module to read the stdout from my python script. However, I noticed when my python emit message between every second. The nodejs callback can only collect the stdout at the end of the python script ends. Python Script import time for i in range(0,5): ····print i ····time.sleep(0.5) and the nodejs script is var cp = require('child_process'); var spw = cp.spawn('python', ['tql.py']), str = ""; spw.stdout.on('data', function (data) { str+= data; console.log

问题 In a node script, I have spawned a child process which executes a batch file run.bat , to terminate the program started by the batch-file i need to send ctrl+c combination to the child process , it is required for me to send ctrl+c combination to the program using stdin.write() method. var hmc = require('child_process').spawn('cmd'); hmc.stdin.write('run.bat \n'); 回答1: A CTRL + C is equivalent to sending a SIGINT on Windows. Rather than trying to send a keystroke to the process, you can send

问题 I want to open a spawn SSH connection and then query a MySQL Server for new users (in a loop), and if a new user is found a command should be sent to this SSH Connection via Expect. I don't know if this is possible, up until now i allways kill ssh.exe when i try the "send" command after the MySQL Query. I want the SSH to be open because it takes 10 seconds to login with Expect (Host ist slow) and i don't want that pause everytime a create a user. How can i do this? What i am doing: ... set db

问题 I'm trying to pass an image as base64 to python for processing using spawn like so: return new Promise(function(resolve, reject) { const pythonProcess = spawn('python',["./python.py", imageDataURI]); pythonProcess.stdout.on('data', (response) => { resolve(response); }); }); But I'm getting error: Error: spawn E2BIG I guess it's too big to pass like this, any alternative ways to pass it to spawn? Seems related: Node / child_process throwing E2BIG 回答1: Thanks to ottomeister's answer I did it