如何从node.js调用外部脚本/程序?

I have a C++ program and a Python script that I want to incorporate into my node.js web app.

我有一个c++程序和一个Python脚本，我想把它们合并到我的节点中。js web应用程序。

I want to use them to parse the files that are uploaded to my site; it may take a few seconds to process, so I would avoid to block the app as well.

我想用它们来解析上传到我网站的文件;可能需要几秒钟的时间来处理，所以我也会避免屏蔽这个应用。

How can I just accept the file then just run the C++ program and script in a sub-process from a node.js controller?

如何接受文件，然后在节点的子进程中运行c++程序和脚本。js控制器吗?

1 个解决方案

#1

see child_process. here is an example using spawn, which allows you to write to stdin and read from stderr/stdout as data is output. If you have no need to write to stdin and you can handle all output when the process completes, child_process.exec offers a slightly shorter syntax to execute a command.

看到child_process。这里有一个使用spawn的示例，它允许您将数据写入stdin并在输出时从stderr/stdout中读取。如果您不需要写到stdin，并且可以在进程完成时处理所有输出，那么child_process。exec提供了更短的语法来执行命令。

// with express 3.x
var express = require('express'); 
var app = express();
app.use(express.logger('dev'));
app.use(express.bodyParser());
app.use(app.router);
app.post('/upload', function(req, res){
   if(req.files.myUpload){
     var python = require('child_process').spawn(
     'python',
     // second argument is array of parameters, e.g.:
     ["/home/me/pythonScript.py"
     , req.files.myUpload.path
     , req.files.myUpload.type]
     );
     var output = "";
     python.stdout.on('data', function(data){ output += data });
     python.on('close', function(code){ 
       if (code !== 0) {  
           return res.send(500, code); 
       }
       return res.send(200, output);
     });
   } else { res.send(500, 'No file found') }
});

require('http').createServer(app).listen(3000, function(){
  console.log('Listening on 3000');
});