代码只在window下可用

间接上代码:
代码摘抄过程中可能有脱漏或谬误，欢送指出

electron: "25.2.0"，低于此版本的 protocol 写法不同，请自行处理

须要的npm包:

npm install gm

须要的第三方开源软件:
GraphicsMagick
extracticon.exe

GraphicsMagick 的效率不错，70MB｜4961 × 7016 × 32 BPP的png图片生成300px左右的缩略图耗时大概2s
extracticon 能够提取exe图标里最大的那个为png图片，所以图片大小不肯定对立，最大尺寸为 256×256，最小 16×16

img_load:

const spawn = require("child_process").spawnconst os = require("os")const path = require("path")const fs = require("fs")// 我装置GraphicsMagick后无奈间接调用，但控制台能够，理由不晓得，这里就间接指定程序门路const gm = require("gm").subClass({    appPath: "d:/GraphicsMagick/App/",})const tempDir = os.tmpdir()const exeRoot = process.cwd()console.log(tempDir, exeRoot)function isExists(filepath) {    try {        fs.accessSync(filepath, fs.constants.F_OK | fs.constants.R_OK)        return true    } catch (error) {        return false    }}function getExtracticonPath() {    // 我放在了根目录下的utils文件夹里    const p = path.join(exeRoot, "/utils/Image/extracticon.exe")    console.log(p)    if (isExists(p)) {        return p    }    return ""}export function getIcon(filepath) {    return new Promise((resolve, reject) => {        if (!isExists(filepath)) {            reject("file not found!")        }        const pngname = path.parse(filepath).name + ".png"        const pngpath = path.join(tempDir, pngname)        if (isExists(pngpath)) {            resolve(gm(pngpath).stream("png"))        }        const extracticon = getExtracticonPath()        if (extracticon == "") {            reject("extracticon.exe not found!")        }        const child = spawn(extracticon, [filepath, pngpath])        child.on("close", (code) => {            if (code == 0) {                resolve(gm(pngpath).stream("png"))            }            reject("error")        })    })}export function getThumbnail(url, width = 240, height = 400, option = ">") {    if (!isExists(url)) {        throw new Error("file not found!")    }    return gm(url).thumbnail(width, height, option).stream("png")}

electron:

import { getIcon, getThumbnail } from "./img_load"app.whenReady().then(()=>{// 404的返回能够依据须要自行批改// limg与前面的exei都是能够自定义的protocol.handle("limg", (request) => {        let url = request.url.slice("limg:///".length)        // 这个是node的形式，但反对的格局太少，记得就只有png和jpg，益处是不必第三方软件        // const image = await nativeImage.createThumbnailFromPath(url, {        //     width: 240,        //     height: 100,        // })        try {            let imageBuffer = getThumbnail(url)            return new Response(imageBuffer, {                headers: { "content-type": "image/png" },            })        } catch (error) {            console.log(error);            return new Response("", {                status: 404,                headers: { "content-type": "image/png" },            })        }    })    protocol.handle("exei", async (request) => {        let url = request.url.slice("exei:///".length)        try {            let imageBuffer = await getIcon(url)            return new Response(imageBuffer, {                headers: { "content-type": "image/png" },            })        } catch (error) {            console.log(error);            return new Response("", {                status: 404,                headers: { "content-type": "image/png" },            })        }    })})

vue+pug:

const setAltImg = ({target}) => {    target.src = "limg:///E:/默认图片.jpg" }img(src="exei:///d:/Software/Ruler.exe", @error="setAltImg")