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目前我在 Node.js 中有一个代码,它调用程序“EnergyPlus”。不幸的是,我必须启动一个外部控制台并“手动”执行 Node.js 文件。但是,我希望能够在我的应用程序前端按下一个按钮来启动“EnergyPlus”plus 程序。

这是我的 Node.js 文件:

var spawn = require('child_process').spawn,
child = spawn('C:\\EnergyPlusV9-0-1\\EP-Launch.exe', ["C:/Windows/System32/Drivers/etc/hosts"]);

child.stdout.on('data', function (data) {
    console.log('stdout: ' + data);
});

child.stderr.on('data', function (data) {
    console.log('stderr: ' + data);
});

child.on('close', function (code) {
    console.log('child process exited with code ' + code);
});

有没有办法将此代码集成到按钮中或在单击按钮后执行此代码?非常感谢您!

4

2 回答 2

1

您可以这样做:

  1. 在客户端按钮单击上,向您的快速 API 中的某个路径发出请求
  2. 您的 express API 通过启动程序来处理请求

编写如下所示的代码:

客户端.html:

<button onclick="func()">start app</button>
<script>
  const func = () => fetch('http://your.api.url/some/path');
</script>

server.js:

// imports
const express = require('express');
const spawn = require('child_process').spawn;

// create server
const app = express();

// upon request to the launch path, launch the program
app.get('/some/path', (req, res) => {

  let child = spawn(
    'C:\\EnergyPlusV9-0-1\\EP-Launch.exe',
    ["C:/Windows/System32/Drivers/etc/hosts"]
  );
  // etc (rest of the code you wrote)

  // response. You can modify this to send a custom response to your client
  res.send('');
})
于 2019-01-08T13:07:39.340 回答
0

非常感谢你的帮助!我找到了解决我的问题的方法。从头开始,在我的应用程序中,我使用 React 和 Webpack。为了解决我的问题,我按以下方式构建了我的 Server.js 文件(我在其中设置了 Express 行为):

const express = require('express');
const app = express();
const port = process.env.PORT || 5000;
const fs = require("fs")
const spawn = require('child_process').spawn;

// console.log that your server is up and running
app.listen(port, () => console.log(`Listening on port ${port}`));
app.use(cors())

// create a GET route
app.get('/express_backend/:filename', (body, res) => {
const f = body.params.filename;

// open EnergyPlus Programm with a specific file which is stored localy
let child = spawn(
'C:\\EnergyPlusV9-0-1\\EP-Launch.exe',
 [process.cwd()+"src/"+ f + ".idf"]
 );

child.stdout.on('data', function (data) {
console.log('stdout: ' + data);
});

child.stderr.on('data', function (data) {
console.log('stderr: ' + data);
});

child.on('close', function (code) {
console.log('child process exited with code ' + code);
});

res.send('EnergyPlus is running');
});

// default options
app.use(fileUpload());

//post the uploaded file into the local storage
app.post('/upload', function(req, res) {
  ...
}

// The name of the input field (i.e. "sampleFile") is used to retrieve the uploaded file
let sampleFile = req.files.file;

// Use the mv() method to place the file localy
 fs.writeFile(__dirname + `/upload/${sampleFile.name}`, sampleFile.data,
(err) => {
   ....
  })
});

就像 Nino Filiu 在他的帖子中提到的那样,我将 child spawn 功能集成到 server.js 中。首先,我用特定文件调用 EP launch.ex,我存储在本地(这个函数不是这个答案的一部分)。“C:\EnergyPlusV9-0-1\EP-Launch.exe”是 EnergyPlus 的路径。"[process.cwd()+"src/"+ f + ".idf"]" 帮助 EnergyPlus 直接打开本地存储的字段。所以关于我的问题的重要一点是 app.get,它是我在 App.js 中触发的。在 App.js 中,我这样调用 spawn 子进程:

class App extends Component { 

constructor(props){
super(props)
this.state = {filename: null}
};

componentDidMount() {
  ...
};

callBackendAPI = async () => {
  ...
};

//trigger the spawn child function within server.js
startEnergyPlus = (e) =>{
fetch (`http://localhost:5000/express_backend/${this.state.filename}`, {
method: "GET"
});

render(){
 return( 
  <div className="App">
   <button onClick={this.startEnergyPlus}>start app</button>
  </div>
};

就是这样。希望它是清晰和有帮助的。如果没有,请发表评论!

于 2019-01-09T11:50:54.690 回答