[SOLVED] async read keypressed in terminal

[VladVons]

i want to read in terminal keypressed while http server is running.
please hint me

[jimmo]

i want to read in terminal keypressed while http server is running.

You can use select or poll on sys.stdin to see if there are characters available (which you can then read using sys.stdin.read).

More info here: viewtopic.php?f=18&t=6954&p=39455

[VladVons]

thanks jimmo

Code: Select all

import uasyncio as asyncio
import sys
import select


async def Task1():
  while True:
    print('Task1')
    await asyncio.sleep(1)

async def Task2():
  while True:
    await asyncio.sleep(0.1)
    while sys.stdin in select.select([sys.stdin], [], [], 0)[0]:
        ch = sys.stdin.read(1)
        print('none block input char', ch)


loop = asyncio.get_event_loop()
loop.create_task(Task1())
loop.create_task(Task2())
loop.run_forever()

[VladVons]

async non blocking keyboard input example

Code: Select all

import sys
import uasyncio as asyncio
import select

def GetInputChr():
    R = ''
    while sys.stdin in select.select([sys.stdin], [], [], 0)[0]:
        R = sys.stdin.read(1)
    return R

async def GetInputStr(aPrompt = ''):
    R = ''
    while True:
        K = GetInputChr()
        if (K):
            if (ord(K) == 10): # enter
                print()
                return R
            elif (ord(K) == 27): # esc
                return ''
            elif (ord(K) == 127): # bs
                R = R[:-1]
            else:
                R += K
        sys.stdout.write("%s%s   \r" % (aPrompt, R))
        await asyncio.sleep(0.1)


async def Test1():
    while True:
        print('Test1')
        await asyncio.sleep(5)


async def Test2():
    S = ''
    while True:
        print('Test2')

        S = await GetInputStr('Prompt: ')
        print('input', S)


loop = asyncio.get_event_loop()
loop.create_task(Test1())
loop.create_task(Test2())
loop.run_forever()

[pythoncoder]

Note that select.select is deprecated in favour of .poll or (usually more RAM efficient) .ipoll.

[VladVons]

Peter, no theme in internet
Hope I`m on a right way with select.poll()

Code: Select all

class TKbdTerm():
    def __init__(self):
        self.Poller = select.poll()
        self.Poller.register(sys.stdin, select.POLLIN)

    def GetChr(self):
        for s, ev in self.Poller.poll(500):
            return s.read(1)

    async def Input(self, aPrompt = ''):
        R = ''
        while True:
            K = self.GetChr()
            if (K):
                if (ord(K) == 10): # enter
                    print()
                    return R
                elif (ord(K) == 27): # esc
                    return ''
                elif (ord(K) == 127): # bs
                    R = R[:-1]
                else:
                    R += K
                sys.stdout.write("%s%s   \r" % (aPrompt, R))
            await asyncio.sleep(0.2)