Electron 桌面程序读取dll动态库

序幕：被GFW狙击的第一次构建

当我在工位上输入npm install electron时，控制台跳出的红色警报如同数字柏林墙上的一道弹痕：

Error: connect ETIMEDOUT 104.20.22.46:443

网络问题不用愁，请移步我的另外文章进行配置：

electron 客户端 windows linux（麒麟V10）多系统离线打包 最新版 ＜一＞_electron linux 离线打包-CSDN博客

第一章：构建electron-builder

builder排除文件夹，简单配置如下（package.json中）：

"build": {"appId": "com.example.win7app","win": {"target": "nsis","defaultArch": "ia32"},"extraFiles": [{"from": "resources","to": "Resources","filter": ["**/*"]}],"nsis": {"oneClick": false,"allowToChangeInstallationDirectory": true}},

我们需要在这个文件夹中读取dll文件，同时希望它打包后在安装目录下。

第二章：跨维度通信协议——主进程与渲染进程的量子纠缠

根目录添加preload.js,添加如下代码：

// preload.js
const { contextBridge, ipcRenderer } = require('electron');// 向渲染进程暴露安全的 API 方法
contextBridge.exposeInMainWorld('electronAPI',{// 示例：调用 Node.js 文件系统 APIreadFile: async (path) => {const fs = await import('fs/promises');return fs.readFile(path, 'utf-8');},// 示例：进程间通信（IPC）openDialog: () => ipcRenderer.invoke('dialog:open'),// 检查是否存在加密狗并且是否匹配成功checkIfLock: () => ipcRenderer.invoke('checkIfLock'),captureUKey: () => ipcRenderer.invoke('captureUKey'),// 关闭窗口closeWindow: () => ipcRenderer.invoke('closeWindow'),// 监听打开设置onAction: (callback) => {ipcRenderer.on('renderer-action', (event, arg) => callback(arg))},}
)

然后再mainjs（electron主进程）中配置文件：

let mainWindow, tray = null;
function createWindow() {mainWindow = new BrowserWindow({width: 800,height: 600,webPreferences: {preload: path.join(__dirname, 'preload.js'), // 指定预加载脚本contextIsolation: true, // 开启上下文隔离（安全必备）nodeIntegration: false  // 禁用直接 Node.js 访问}})// 隐藏菜单mainWindow.setMenu(null);// 加载本地页面（开发时可替换为本地服务地址，如 http://localhost:3000）mainWindow.loadFile(path.join(__dirname, 'src', 'index.html'));// 窗口关闭事件处理mainWindow.on('close', (event) => {if (!app.isQuiting) {event.preventDefault()const choice = dialog.showMessageBoxSync(mainWindow, {type: 'question',buttons: ['直接退出', '最小化到托盘'],title: '确认',message: '您要如何操作？',defaultId: 1})if (choice === 0) {app.isQuiting = trueapp.quit()} else {mainWindow.hide()}}})
}

最后在html中使用上述方法（html中使用）：

<script>//【IPC通信】检测开关(true false)
const checkIfLock = window.electronAPI.checkIfLock;
const checkArm = window.electronAPI.captureUKey;
const closeWindow = window.electronAPI.closeWindow;
// 打开设置
window.electronAPI.onAction(({ type, data }) => {switch(type) {case 'openSettings':showSetting()break;}
})// 显示设置
function showSetting () {try {var remortroot = localStorage.dpm_root;var remortport = localStorage.dpm_port;if (remortroot != null) {$("#remortroot").val(remortroot);}if (remortport != null) {$("#remortport").val(remortport);}$('#myModal').modal('show');} catch (err) {$('#myModal').modal('show');}
}// ===========================================
var timeout;
var lockState = false;
$(function () {checkIfLock().then(res => {lockState = res;})//初始化设置var remortroot = localStorage.dpm_root;//服务器IP地址var remortport = localStorage.dpm_port;//端口号if (remortroot == null || remortroot == "" || remortroot == "undefined"|| remortroot == null || remortroot == "" || remortroot == "undefined") {var err = "首次登录，请填写网络配置";showConfirmMsg(err, function (r) {if (r) {$('#myModal').modal('show');}});} else {loadLoginPage(remortroot, remortport);}
});function isPort(str) {var parten = /^(\d)+$/g;if (parten.test(str) && parseInt(str) <= 65535 && parseInt(str) >= 0) {return true;} else {return false;}
}
function isIP(strIP) {var re = /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/gif (re.test(strIP)) {if (RegExp.$1 < 256 && RegExp.$2 < 256 && RegExp.$3 < 256 && RegExp.$4 < 256) return true;}return false;
}
function sendUrlPort(remortroot, remortport) {var err = "";if (isIP(remortroot)) {} else {err += "服务器地址无效,";}if (isPort(remortport)) {} else {err += "端口号无效,";}if (err != "" && err.length > 0) {err = err.substring(0, err.length - 1);showConfirmMsg(err, function (r) {if (r) {$('#myModal').modal('show');}});} else {layer.msg('正在加载登录页面，请稍候。。。', {icon: 16,shade: 0.01,time: 5000000,shadeClose: false});var dpmHid = $("#eam_hid").text();var ifUd = "";if (false == lockState) {//false代表 u盾登录 需要验证uidifUd = "xxx"}var url = "https://" + remortroot + ":" + remortport$.ajax({url: url,type: 'GET',timeout: 100000,datatype: "json",complete: function (response, textStatus) {//启动u盾检测timeout = setInterval("testUd()", 3000);layer.closeAll();if (response.status == 200) {localStorage.dpm_root = remortroot;localStorage.dpm_port = remortport;$('#github-iframe').attr('src', url);} else if (textStatus == 'timeout') {showConfirmMsg('未能成功连接系统(超时)，请检查网络配置或联系管理员!', function (r) {if (r) {$('#myModal').modal('show');}});} else {showConfirmMsg('未能成功连接系统，请检查网络配置或联系管理员!', function (r) {if (r) {$('#myModal').modal('show');}});}}});}
}//启动时：加载登录页，并判断u端是否存在
function loadLoginPage(remortroot, remortport) {checkArm().then(res => {if (true == lockState) {if (false == res.flag) {$("#eam_hid").text("");}sendUrlPort(remortroot, remortport);} else {if (true == res.flag) {$("#eam_hid").text(res.randomNum);sendUrlPort(remortroot, remortport);} else {showLongErrorMsg("未插入U盾");}}})}
//启动后 监测u盾是否插入，未插入则退出系统
function testUd() {checkArm().then(res => {if (true == lockState) {if (false == res) {$("#eam_hid").text("");}} else {if (false == res) {clearInterval(timeout);showLongErrorMsg("未插入U盾");}}})
}
function showConfirmMsg(msg, callBack) {art.dialog({id: 'confirmId',title: '系统提示',content: msg,icon: 'warning',background: '#000000',opacity: 0.1,lock: true,button: [{name: '确定',callback: function () {callBack(true);},focus: true}]});
}
//错误提示
function showErrorMsg(msg) {top.art.dialog({id: 'errorId',title: '系统提示',content: msg,icon: 'error',time: 5,background: '#000',opacity: 0.1,lock: true,okVal: '关闭',ok: true});
}
function showLongErrorMsg(msg) {top.art.dialog({id: 'errorId',title: '5秒后自动关闭客户端...',content: msg,icon: 'error',time: 5,background: '#000',opacity: 0.1,lock: true,cancelVal: '关闭',cancel: function () {closeWindow();},close: function () {closeWindow();}});
}//弹出框事件 
$("#initsetbtn").click(function () {var remortroot = $("#remortroot").val();var remortport = $("#remortport").val();$('#myModal').modal('hide');loadLoginPage(remortroot, remortport);
});</script>

第三章：调用dll

调用dll推荐使用koffi。另一篇文章也有说明：

Electron驯龙记：在Win7的废墟上唤醒32位DLL古老巨龙-CSDN博客

示例代码：
 

// 在mainjs中// 是否捕获U盾
ipcMain.handle('captureUKey', () => {return new Promise((resolve, reject) => {let promiseAry = [];var count = 0;while (count++ < 20) { //连续20次都失败 才认为失败promiseAry.push(checkOnceUKey());}Promise.all(promiseAry).then((results) => {console.log('所有检查结果:', results);if (Array.isArray(results) && results.length > 0) {resolve({flag: results.filter(item => item.flag == false).length == 0 ? true: false,randomNum: results[results.length - 1].randomNum || ''})} else {resolve({flag: false,randomNum: ''})}}) }).catch(error => {console.error('是否捕获U盾出错:', error);return false; // 读取失败})
})
// 单次检查U盾
function checkOnceUKey() {return new Promise((resolve, reject) => {let flag = false;let randomNum = ''; // 随机数// 常量定义const DONGLE_SUCCESS = 0;const koffi = require('koffi');// 加载 DLLconst dllPath = path.join(getDataPath(), 'Dongle_d.dll');const dongleLib = koffi.load(dllPath);// 定义结构体字段偏移量（单位：字节）const InfoStructOffsets = {m_Ver: 0,m_Type: 2,m_BirthDay: 4,m_Agent: 12,m_PID: 16,m_UserID: 20,m_HID: 24,m_IsMother: 32,m_DevType: 36};const InfoStructSize = 40;const Dongle_Enum = dongleLib.func('int Dongle_Enum(void*, int*)');const Dongle_Open = dongleLib.func('int Dongle_Open(int*, int)');const Dongle_ResetState = dongleLib.func('int Dongle_ResetState(int)');const Dongle_GenRandom = dongleLib.func('int Dongle_GenRandom(int, int, void*)');const Dongle_Close = dongleLib.func('int Dongle_Close(int)');// 初始化缓冲区const dongleInfo = Buffer.alloc(1024); // 假设最多 25 个设备（1024 / 40 ≈ 25）const countBuffer = Buffer.alloc(4);countBuffer.writeInt32LE(0, 0);// 1️⃣ 枚举设备let result = Dongle_Enum(dongleInfo, countBuffer);console.log(`** Dongle_Enum **: 0x${result.toString(16).padStart(8, '0')}`);if (result !== DONGLE_SUCCESS) {console.error(`** Enum errcode **: 0x${result.toString(16).padStart(8, '0')}`);flag = false;}const deviceCount = countBuffer.readInt32LE(0);console.log(`** Find Device **:  ${deviceCount}`);if (deviceCount === 0) {console.log('** No Device **');flag = false;}// 3️⃣ 打开设备const handleBuffer = Buffer.alloc(4);result = Dongle_Open(handleBuffer, 0);const handle = handleBuffer.readInt32LE(0);console.log(`** Dongle_Open **: 0x${result.toString(16).padStart(8, '0')}`);if (result !== DONGLE_SUCCESS) {console.error(`** Open Failed **`);flag = false;} else {console.log(`** Open Success **: [handle=0x${handle.toString(16).padStart(8, '0')}]`);randomNum = `0x${handle.toString(16).padStart(8, '0')}`;Dongle_Close(handle);flag = true;}// 4️⃣ 重置 COS 状态/*result = Dongle_ResetState(handle);console.log(`Dongle_ResetState 返回值: 0x${result.toString(16).padStart(8, '0')}`);if (result !== DONGLE_SUCCESS) {console.error(`重置 COS 状态失败`);Dongle_Close(handle);return;}console.log('重置 COS 状态成功');*/// 5️⃣ 生成随机数// const randomLen = 16;// const randomBuffer = Buffer.alloc(randomLen);// result = Dongle_GenRandom(handle, randomLen, randomBuffer);// console.log(`Dongle_GenRandom : 0x${result.toString(16).padStart(8, '0')}`);// if (result !== DONGLE_SUCCESS) {//   console.error(`生成随机数失败`);//   Dongle_Close(handle);// } else {//   randomNum = randomBuffer.toJSON().data.map(b => PrefixZero(b, 2)).join(' ').toUpperCase();//   Dongle_Close(handle);// }//console.log(`随机数据: ${randomBuffer.toJSON().data.map(b => PrefixZero(b, 2)).join(' ').toUpperCase()}`);/*// 6️⃣ 关闭设备result = Dongle_Close(handle);console.log(`Dongle_Close 返回值: 0x${result.toString(16).padStart(8, '0')}`);if (result !== DONGLE_SUCCESS) {console.error(`关闭设备失败`);return;}console.log('成功关闭设备');*/resolve({flag,randomNum})}).catch(err => {console.error('单次读取U盾失败:', err);return false; // 读取失败})
}

后记：与时间赛跑的混乱代码之旅​
回首这次Electron的改造征程，更像是一场与编译警告共舞的午夜狂奔。由于项目周期紧张，某些技术方案难免带着「先跑起来再优化」的仓促痕迹——就像在暴雨中搭建帐篷，难免会有几处漏水的接缝。

过程中那些临时添加的Webpack补丁、为绕过环境问题硬编码的路径、甚至为了紧急交付保留的TODO注释，都如同代码迷宫中未清理的记号。虽然最终功能得以实现，但我深知这座代码大厦的某些承重墙上，或许还留着需要加固的裂缝。

在此特别恳请各位同行：若您在阅读中发现任何逻辑漏洞、安全隐患或架构缺陷，请务必通过Issue或邮件指正。您的一条建议，或许就能避免某个深夜的生产环境告警。技术之路本就如履薄冰，唯有开放交流才能让我们的每一步走得更稳。

~ end