Electron - #005 后端node调用文件打开对话框获取绝对路径传递给前端

文章目录

• 后端node调用文件打开对话框获取绝对路径传递给前端
• • 1 目标
  • 2 步骤
  • • 2.1 src-electron/main.js
    • 2.2 src-electron/preload.js
    • 2.3 HelloWorld.vue
    • 2.4 运行工程

后端node调用文件打开对话框获取绝对路径传递给前端

1 目标

后端node调用文件打开对话框获取绝对路径。

2 步骤

2.1 src-electron/main.js

/*
 * @Author: alan.lau
 * @Date: 2024-09-08 20:35:17
 * @LastEditTime: 2024-09-10 21:30:27
 * @LastEditors: alan.lau
 * @Description:
 * @FilePath: \electron-demo\src-electron\main.js
 * 可以输入预定的版权声明、个性签名、空行等
 */
const { app, BrowserWindow, ipcMain,dialog } = require("electron");
const { join } = require("path");
const fs = require("fs");
const path = require("path");

// 屏蔽安全警告
process.env["ELECTRON_DISABLE_SECURITY_WARNINGS"] = "true";

// 创建浏览器窗口时，调用这个函数。
const createWindow = () => {
  const win = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      nodeIntegration: true, // 使渲染进程拥有node环境
      //关闭web权限检查，允许跨域
      webSecurity: false,
      // Use pluginOptions.nodeIntegration, leave this alone
      // See nklayman.github.io/vue-cli-plugin-electron-builder/guide/security.html#node-integration for more info
      nodeIntegration: process.env.ELECTRON_NODE_INTEGRATION,
      contextIsolation: !process.env.ELECTRON_NODE_INTEGRATION,
      preload: path.join(__dirname, "preload.js"), // 这里是预加载脚本的位置
    },
  });

  // win.loadURL('http://localhost:3000')
  // development模式
  if (process.env.VITE_DEV_SERVER_URL) {
    win.loadURL(process.env.VITE_DEV_SERVER_URL);
    // 开启调试台
    win.webContents.openDevTools();
  } else {
    win.loadFile(join(__dirname, "../dist/index.html"));
  }
};

// Electron 会在初始化后并准备
app.whenReady().then(() => {
  createWindow();
  app.on("activate", () => {
    if (BrowserWindow.getAllWindows().length === 0) createWindow();
  });
});

app.on("window-all-closed", () => {
  if (process.platform !== "darwin") app.quit();
});

// 监听从渲染进程发来的 'read-file' 请求，并读取文件
ipcMain.handle('read-file', async (event, filePath) => {
    try {
        const data = fs.readFileSync(filePath, 'utf-8');
        return data;  // 返回文件内容
    } catch (error) {
        console.error('读取文件失败:', error);
        return null;
    }
});

// 主进程中添加 IPC 事件处理器，打开文件对话框并返回选中文件路径
// 处理打开文件对话框
ipcMain.handle("open-file-dialog", async () => {
  const { canceled, filePaths } = await dialog.showOpenDialog({
    properties: ["openFile"],
  });
  if (canceled) {
    return null;
  } else {
    return filePaths[0]; // 返回文件路径
  }
});

2.2 src-electron/preload.js

const { contextBridge, ipcRenderer } = require("electron");

contextBridge.exposeInMainWorld("electronAPI", {
  readFile: (filePath) => ipcRenderer.invoke("read-file", filePath),
  openFileDialog: () => ipcRenderer.invoke("open-file-dialog"), // 确保暴露的方法名称与前端一致
});

2.3 HelloWorld.vue

<script setup lang="ts">
import { ref, onMounted } from "vue";
import * as Cesium from 'cesium';

defineProps<{ msg: string }>()

const count = ref(0)
var viewer: Cesium.Viewer | null = null;
const filePath = ref<string | null>(null);
const fileContent = ref<string | null>(null);
onMounted(() => {
  viewer = new Cesium.Viewer('cesiumContainer', {
    terrain: Cesium.Terrain.fromWorldTerrain(), // 地形数据
  });
});

const handleReadFileFromNode = async () => {
  const content = await window.electronAPI.readFile('D:\\work\\111.txt');  // 读取文件内容
  console.log(content)

};

const handleSelectFile = async () => {
  const path = await (window as any).electronAPI.openFileDialog();
  if (path) {
    filePath.value = path;

    // 可选：读取文件内容
    const content = await (window as any).electronAPI.readFile(path);
    fileContent.value = content;
  }
};
</script>

<template>
  <el-button type="primary"  @click="handleSelectFile">选择文件</el-button>
  <p>选中文件路径: {{ filePath }}</p>
  <p>文件内容:</p>
  <pre>{{ fileContent }}</pre>
  <h1>{{ msg }}</h1>
  <el-button type="primary" @click="handleReadFileFromNode">我是 ElButton</el-button>

  <el-container class="home-container">
    <el-header>
    </el-header>
    <el-main>
      <div id="cesiumContainer">
      </div>
    </el-main>
  </el-container>
</template>

<style scoped>
.read-the-docs {
  color: #888;
}
</style>

2.4 运行工程

  npm run tauri dev

看到一下界面说明成功