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electron - 在 Electron 中写入 "appData"中的文件。在哪里添加 import { app } from "electron";？

转载 作者：行者123 更新时间：2023-12-03 12:30:04 32 4
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我正在制作我的第一个 Electron 应用程序。我正在尝试将文本文件保存到 appData 文件夹(例如 C:\Users\user\AppData\Roaming)。我知道我需要添加 从“Electron ”导入{应用}； 有些地方，但我不确定把它放在哪里。

在我的 index.js javascript 中，我正在编写用户以他的表单提交到文本文件的数据库设置。这是我需要有 appData 目录地址的地方。

// Write data to text file
var filepath = app.getPath("appData") 
var filename = "database_quick_image_forensics.txt"
var inp_data = inp_host + "|" + inp_username + "|" + inp_password + "|" + inp_database_name + "|" + inp_table_prefix;
write_to_file(filepath, filename, inp_data);

我的整个代码如下:

./setup/index.html 
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Setup</title>
    <!-- https://electronjs.org/docs/tutorial/security#csp-meta-tag -->

        <!-- CSS -->
            <link rel="stylesheet" type="text/css" href="../_webdesign/dark/dark.css" />
        <!-- // CSS -->


    <!-- jQuery -->
    <script>window.$ = window.jQuery = require('../javascripts/jquery/jquery-3.4.1.js');</script>
    <script src="../javascripts/jquery/jquery-3.4.1.js" charset="utf-8"></script>
    <!-- //jQuery -->

    <!-- jQuery -->
    <script src="./index.js" charset="utf-8"></script>
    <!-- //jQuery -->
</head>
<body>
<div id="main_single_column">
  <h1>Setup</h1>

<!-- Feedback -->
    <div id="feedback_div" class="success">
        <p id="feedback_p">Success</p>
    </div>
<!-- //Feedback -->

<!-- Database connection form -->

      <p>Host:<br />
      <input type="text" name="inp_host" id="inp_host" value="localhost" />
      </p>

      <p>Port:<br />
      <input type="text" name="inpport" id="inp_port" value="" />
      </p>

      <p>Username:<br />
      <input type="text" name="inp_username" id="inp_username" value="root" />
      </p>

      <p>Password:<br />
      <input type="text" name="inp_password" id="inp_password" />
      </p>

      <p>Database name:<br />
      <input type="text" name="inp_database_name" id="inp_database_name" value="quick" />
      </p>

      <p>Table prefix:<br />
      <input type="text" name="inp_table_prefix" id="inp_table_prefix" value="cf_" />
      </p>

      <p>
      <button id="form_connect_to_database_submit">Connect to database</button>
      </p>

<!-- //Database connection form -->
</div>



</body>
</html>

./setup/index.js 
const fs = require('fs');

// Action = On submit
$(document).ready(function(){

    $("#form_connect_to_database_submit").click( function() {
        // Feedback
        $('#feedback_div').show();
        $('#feedback_div').removeClass("success");
        $('#feedback_div').addClass("info");
        $('#feedback_p').text("Connecting!")

        // get all the inputs
        var inp_host = $("#inp_host"). val();
        var inp_username = $("#inp_username"). val();
        var inp_password = $("#inp_password"). val();
        var inp_database_name = $("#inp_database_name"). val();
        var inp_table_prefix = $("#inp_table_prefix"). val();

        // Test connection
        var connection_result = connect_to_database(inp_host, inp_username, inp_password, inp_database_name, inp_table_prefix);
        if(connection_result != "connection_ok"){
            // Connection Failed
            $('#feedback_div').removeClass("info");
            $('#feedback_div').addClass("error");
            $('#feedback_p').text(connection_result)
        }
        else{
            // Connection OK
            $('#feedback_div').removeClass("info");
            $('#feedback_div').addClass("success");
            $('#feedback_p').text("Connected")

            // Write data to text file
            var filepath = app.getPath("appData") 
            var filename = "database_quick_image_forensics.txt"
            var inp_data = inp_host + "|" + inp_username + "|" + inp_password + "|" + inp_database_name + "|" + inp_table_prefix;
            $('#feedback_p').text("Connected " + filepath)
            write_to_file(filepath, filename, inp_data);

            // Feedback
            $('#feedback_div').removeClass("info");
            $('#feedback_div').addClass("success");
            $('#feedback_p').text("Connected to")
        }




    });
    $('#inp_host').focus();
});


// Function connect to database
function connect_to_database(inp_host, inp_username, inp_password, inp_database_name, inp_table_prefix){
    var mysql = require('mysql');

    // Add the credentials to access your database
    var connection = mysql.createConnection({
        host     : inp_host,
        user     : inp_username,
        password : null, // or the original password : 'apaswword'
        database : inp_database_name
    });

    // connect to mysql
    connection.connect(function(err) {
        // in case of error
        if(err){
            console.log(err.code);
            console.log(err.fatal);
            return err.code;
        }
    });


    // Perform a query
    $query = 'SELECT * FROM `cf_admin_liquidbase` LIMIT 10';
    connection.query($query, function(err, rows, fields) {
        if(err){
            console.log("An error ocurred performing the query.");
            console.log(err);
            return;
        }
        console.log("Query succesfully executed", rows);
    });

    return "connection_ok";
} // connect_to_database




// Function write setup
function write_to_file(filepath, filename, inp_data){


    var fullpath = filepath + "\\" + filename;
    fs.writeFile(fullpath, inp_data, (err) => {
        // throws an error, you could also catch it here
        if (err) throw err;
        // success case, the file was saved
        console.log('Lyric saved!');
    });
} // write_to_file

./main.js 
const { app, BrowserWindow } = require('electron')


// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let win


function createWindow () {
  // Create the browser window.
  win = new BrowserWindow({
          width: 800,
          height: 600,
          webPreferences: {
          nodeIntegration: true
          }
  })

  // and load the index.html of the app.
  win.loadFile('index.html')

  // Open the DevTools.
  // win.webContents.openDevTools()

  // Emitted when the window is closed.
  win.on('closed', () => {
          // Dereference the window object, usually you would store windows
          // in an array if your app supports multi windows, this is the time
          // when you should delete the corresponding element.
          win = null
  })
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow)

// Quit when all windows are closed.
app.on('window-all-closed', () => {
  // On macOS it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
          app.quit()
  }
})

app.on('activate', () => {
  // On macOS it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (win === null) {
          createWindow()
  }
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

最佳答案

I know I need to add import { app } from "electron"; some where but I am unsure where to place it.



app模块总是(根据我的经验)导入你的 main过程，以便您可以控制应用程序的生命周期。但是，如果你想使用一些 app renderer 中的模块功能进程，您可以通过 remote 将其导入那里模块(如该问题的已接受答案所示: How to use electron's app.getPath() to store data?) 
const remote = require('electron').remote;
const app = remote.app;
console.log(app.getPath('userData'));
main和 renderer过程是 Electron 中的关键概念所以我建议阅读这些。要点是你有一个 main过程——它没有可视化表示，它与您的应用程序的生命周期有关，创建和销毁 renderer进程(如 BrowserWindows )，渲染器进程之间的通信等 - 你可以拥有尽可能多的 renderer根据需要处理。

所以如果你想读写文件，你可以在 renderer 中进行。过程如上图 - 或者您可以在 main 中进行过程。在后一种情况下，如果 renderer进程要保存文件，它可以向 main 发送消息通过 IPC 处理，发送要保存的数据。

采用哪种方式是一种架构选择。

关于electron - 在 Electron 中写入 "appData"中的文件。在哪里添加 import { app } from "electron";？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59724062/

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