I need to get the pid of current processs on flutter,
but I cann't find any static method in Process.dart, how to get it?
Import dart:io and use the pid property.
import 'dart:io';
...
print('pid: $pid');
https://api.dart.dev/stable/2.13.4/dart-io/Process/pid.html
https://api.flutter.dev/flutter/dart-io/pid.html
Related
I am building a dart program to get the user input. when running the program using the run button I get the output in the output window but I cannot type in it. tried using the terminal to run the program and it worked well. so I want to know what is the right way to take the input from the user?
import 'dart:io';
void main() {
print("enter your name: ");
var name = stdin.readLineSync();
print("hello mrs ${name}");
}
From file -> Preferences -> Settings
search for "Dart: Cli Console"
Dart: Cli Console
Then change the drop-down menu into -terminal-
now you can run again your code and check
you can type in the terminal and your code will work.
In fact the right way using terminal as you did. It's not a fail. It's just how it works.
The answer regarding using the correct vs-code console is correct but you should also check out the dcli package and it's ask function.
Disclaimer: I'm the author of dcli.
My issue is my code during debugging always stops at line 1. For example this is my code:
import gc
import os
import pandas as pd
import shutil
from pandas import DataFrame
from pathlib import Path
from datetime import datetime
from collections import OrderedDict
It simply behaves as if there is a breakpoint in line 1. Before there were comments on the first few lines and Spyder breaks in the middle of the comments. I have to press "Continue" for it to proceed.
Now this does not happen in my other python files so I really don't have the slightest clue how to fix this unless I incrementally write the program and run it.
Anyone face such issue?
in the setting -->iPython console -> debugger, you will see an option "stop debugging on first line of file without breakpoints"
Is there a way to set the multiprocessing method from Python? I do not see a method in the Client() API docs of Dask.distributed that indicates how to set this property.
Update:
For example, is there:
client = Client(multiprocessing='fork')
or
client = Client(multiprocessing='spawn')
?
Unfortunately the multiprocessing context method is set at import time of dask.distributed. If you wanted to set this from Python you could set the config value after you import dask, but before you import dask.distributed.
import dask
dask.config.set({'distributed.worker.multiprocessing-method': 'spawn'})
from dask.distributed import Client
However it's probably more robust to just set this in your config file. See configuration documentation for the various ways to set configuration values.
Note: this is using the configuration as of dask.__version__ == '0.18.0'
I have a fairly lengthy command-line program that requires user input of parameters and then processes using those parameters. What I would like to do is split the program into interactive and non-interactive. I attempted to do that, and intended to have the non-interactive program "call" the interactive program and using the results (parameters), process based on those parameters. The non-interactive part of the program displays results on the console as it processes. I have looked at Process.run and Process.start, but apparently they don't function that way. There is another similar question to this that is about 12-months old, so I thought it worthwhile asking again.
I have looked at Process.run and Process.start, but apparently they don't function that way.
Process.start is what you want here. It can do what you want, but you'll have to become a bit more comfortable with async programming if you aren't already. You'll spawn the process and then asynchronously read and write to the spawned processes stdout and stdin streams.
Your interactive program can do something like this:
// interactive.dart
import 'dart:io';
main() {
var input = stdin.readLineSync();
print(input.toUpperCase());
}
It's using stdin to read input from the command line. Then it outputs the processed result using regular print().
The non-interactive script can spawn and drive that using something like:
import 'dart:convert';
import 'dart:io';
main() {
Process.start("dart", ["interactive.dart"]).then((process) {
process.stdin.writeln("this is the input");
UTF8.decoder.fuse(new LineSplitter()).bind(process.stdout).listen((line) {
print(line);
});
});
}
It uses Process.start to spawn the interactive script. It writes to it using process.stdin. To read the resulting output it has to jump through some hoops to convert the raw byte output to strings for each line, but this is the basic idea.
I want to execute a python or a java class from inside dart.
The following is a snippet which I have used from a stackoverflow question Java
Runtime currentRuntime = Runtime.getRuntime();
Process executeProcess = currentRuntime.exec("cmd /c c:\\somepath\\pythonprogram.py");
I would like to know how to make such calls in dart.
Basically I have a UI where in the user uploads code in java and python.I want to execute the uploaded code from the dart environment instead of creating a routine in java or python on the folder where the code is uploaded.
I personally dont know if this is possible, since dart is purely in a VM.
I want to execute the following command
java abc
from inside dart.
You can simply use Process.run.
import 'dart:io';
main() {
Process.run('java', ['abd']);
}
You can also access to stdout, stderr and exitCode through the resulting ProcessResult :
import 'dart:io';
main() {
Process.run('java', ['abd']).then((ProcessResult pr){
print(pr.exitCode);
print(pr.stdout);
print(pr.stderr);
});
}