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!