electron node.js 实现文件拖动读取文件

Posted 2020-11-24 我有目标

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css/styles.css

1 .for_file_drop {
2     width: 100%;
3     height: 100px;
4     background-color: blueviolet;
5 }

View Code

index.html

 1 <!DOCTYPE html>
 2 <html>
 3   <head>
 4     <meta charset="UTF-8">
 5     
 6     <title>Hello World!</title>
 7     <link rel="stylesheet" href="css/styles.css" />
 8   </head>
 9   <body>
10     <h1>Hello World!</h1>
11     We are using Node.js <span id="node-version"></span>,
12     Chromium <span id="chrome-version"></span>,
13     and Electron <span id="electron-version"></span>.
14    
15 
16     <div>
17         <h1>Process information</h1>
18         <button onclick="getProcessInfo()">查询系统信息</button>
19         </div>
20     
21     <div class="for_file_drop" id="drag_test">
22       <h2>文件拖动到此处</h2>
23       <span></span>
24     </div>
25     <!-- You can also require other files to run in this process -->
26     <script src="./renderer.js"></script>
27 
28    
29 
30   </body>
31 </html>

View Code

renderer.js

const fs = require("fs");

const dragWrapper = document.getElementById("drag_test");
dragWrapper.addEventListener("drop",(e)=>{
    e.preventDefault(); //阻止e的默认行为
    const files = e.dataTransfer.files;
    if (files && files.length>=1){
        const path = files[0].path;
        console.log("file:",path);
        const content = fs.readFileSync(path);
        console.log(content.toString());
    }
})
//这个事件也需要屏蔽
dragWrapper.addEventListener("dragover",(e)=>{
    e.preventDefault();
})
function getProcessInfo(){
    console.log("Cpu Usage:", process.getCPUUsage());
    console.log("env",process.env);
    console.log("arc",process.arch);
}

View Code

main.js

 1 // Modules to control application life and create native browser window
 2 const {app, BrowserWindow} = require(‘electron‘)
 3 const path = require(‘path‘)
 4 
 5 // Keep a global reference of the window object, if you don‘t, the window will
 6 // be closed automatically when the javascript object is garbage collected.
 7 let mainWindow
 8 
 9 function createWindow () {
10   // Create the browser window.
11   mainWindow = new BrowserWindow({
12     width: 800,
13     height: 600,
14     webPreferences: {
15       preload: path.join(__dirname, ‘preload.js‘),
16       nodeIntegration: true // 注入node模块
17     }
18   })
19 
20   // and load the index.html of the app.
21   mainWindow.loadFile(‘index.html‘)
22 
23   // Open the DevTools.
24   // mainWindow.webContents.openDevTools()
25 
26   // Emitted when the window is closed.
27   mainWindow.on(‘closed‘, function () {
28     // Dereference the window object, usually you would store windows
29     // in an array if your app supports multi windows, this is the time
30     // when you should delete the corresponding element.
31     mainWindow = null
32   })
33 }
34 
35 // This method will be called when Electron has finished
36 // initialization and is ready to create browser windows.
37 // Some APIs can only be used after this event occurs.
38 app.on(‘ready‘, createWindow)
39 
40 // Quit when all windows are closed.
41 app.on(‘window-all-closed‘, function () {
42   // On macOS it is common for applications and their menu bar
43   // to stay active until the user quits explicitly with Cmd + Q
44   if (process.platform !== ‘darwin‘) app.quit()
45 })
46 
47 app.on(‘activate‘, function () {
48   // On macOS it‘s common to re-create a window in the app when the
49   // dock icon is clicked and there are no other windows open.
50   if (mainWindow === null) createWindow()
51 })
52 
53 // In this file you can include the rest of your app‘s specific main process
54 // code. You can also put them in separate files and require them here.

View Code

其中的第16行是重点，否则使用process时会出现：process is not defined 的错误。

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