python - 我无法从 Express 应用程序执行 python 脚本

Question

当我单击 Express 应用程序中的按钮时，我尝试执行 python 脚本。该脚本只是打开我的 Raspberry Pi 中的 LED。 我已经测试了这些脚本并且它们可以工作，但是当我尝试从服务器执行它们时它根本不起作用。 我使用“spawn”创建一个子进程，然后通过 stdin 写入来执行脚本。

这是我的路由器文件:

var express = require('express')
var router = express.Router()

var python = require('child_process').spawn('python', [ '-i' ])
//python.setEncoding('utf-8')
python.stdout.pipe(process.stdout)

/* GET home page. */
router.get('/', function(req, res, next) {
    res.render('index')
})

router.get('/green', green)
router.get('/yellow', yellow)
router.get('/red', red)

module.exports = router

function green(req, res) {
    console.log('Turning on green led...')
    python.stdin.write("execfile('./public/python/green_led.py')")
    res.redirect('/')
}

function yellow(req, res) {
    console.log('Turning on yellow led...')
    python.stdin.write("execfile('./public/python/yellow_led.py')")
    res.redirect('/')
}

function red(req, res) {
    console.log('Turning on red led...')
    python.stdin.write("execfile('./public/python/red_led.py')")
    res.redirect('/')
}

您可以查看 Github 存储库 Here

谢谢!

Answer 1

我设法使用 exec 而不是 spawn 修复了这个问题。现在这是我的路由器文件:

var express = require('express')
var router = express.Router()

var exec = require('child_process').exec

/* GET home page. */
router.get('/', function(req, res, next) {
    res.render('index')
})

router.get('/green', green)
router.get('/yellow', yellow)
router.get('/red', red)
router.get('/auto', auto)

module.exports = router

function green(req, res) {
    console.log('Turning on green led...')
    var child = exec('python ./public/python/green_led.py')
    child.stdout.on('data', function(data) {
        console.log('stdout: ' + data)
    })
    child.stderr.on('data', function(data) {
        console.log('stdout: ' + data)
    })
    child.on('close', function(code) {
        console.log('closing code: ' + code)
    })
    res.redirect('/')
}

function yellow(req, res) {
    console.log('Turning on yellow led...')
    var child = exec('python ./public/python/yellow_led.py')
    child.stdout.on('data', function(data) {
        console.log('stdout: ' + data)
    })
    child.stderr.on('data', function(data) {
        console.log('stdout: ' + data)
    })
    child.on('close', function(code) {
        console.log('closing code: ' + code)
    })
    res.redirect('/')
}

function red(req, res) {
    console.log('Turning on red led...')
    var child = exec('python ./public/python/red_led.py')
    child.stdout.on('data', function(data) {
        console.log('stdout: ' + data)
    })
    child.stderr.on('data', function(data) {
        console.log('stdout: ' + data)
    })
    child.on('close', function(code) {
        console.log('closing code: ' + code)
    })
    res.redirect('/')
}

function auto(req, res) {
    console.log('Turning on auto led...')
    var child = exec('python ./public/python/loop_led.py')
    child.stdout.on('data', function(data) {
        console.log('stdout: ' + data)
    })
    child.stderr.on('data', function(data) {
        console.log('stdout: ' + data)
    })
    child.on('close', function(code) {
        console.log('closing code: ' + code)
    })
    res.redirect('/')
}