Question

当我从Express应用程序中单击按钮时，我正在尝试执行python脚本。该脚本只是在我的Raspberry Pi中打开一个LED。我已经测试了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根本不起作用。我正在使用“ spawn”创建一个子进程，然后通过stdin编写脚本文件以执行文件。

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进行了修复。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('/')
}

我无法从Express应用执行python脚本

1 个答案: