electron 无法在IPCRenderer中传递对象/数组,无法克隆对象EventEmitter.i.send.i.send

qvtsj1bj  于 2022-12-16  发布在  Electron
关注(0)|答案(5)|浏览(1338)

无法将任何对象或数组传递给IPCRenderer。

我在通过ipcs传递对象或数组时遇到错误,我甚至尝试使用JSON.stringify转换为字符串进行发送,但它将其转换为空对象字符串。
我试过传递一个fileList、一个对象数组&甚至一个什么都不传递的对象。只有字符串或手写对象可以工作。
我听说它使用结构化克隆算法,并且该算法允许fileList & Array
错误:

electron/js2c/renderer_init.js:74 Uncaught Error: An object could not be cloned.
    at EventEmitter.i.send.i.send (electron/js2c/renderer_init.js:74)
    at HTMLButtonElement.compressNow (ImageHandling.js:190)

我尝试了很多可能的解决方案,但都没有效果
代码:

const compressNow = () => {
    ipcRenderer.send("image:compress", filess).  ///This is the error.
    // filess is a variable containing an array of selected files from an HTML input.
}

现在我已经尝试将filess作为JSON.stringify发送,我尝试将其作为对象发送,但没有任何效果,除非我手动编写一个伪对象或字符串。
这是我的Github Repo for this project

  • 有错误的文件 *J:-

ImageHandling.js

const fs = window.require('fs');
const {ipcRenderer} = require("electron")
const SELECT = (target) => document.querySelector(`${target}`)
var filess = []

const imgUploadInput = SELECT("#imgUploadInput")
const warning = SELECT("#warning")

const setImgBase64 = (imgEl, file) => {

    const ReadAbleFile = fs.readFileSync(file.path).toString('base64')
    let src = "data:image/png;base64," + ReadAbleFile

    imgEl.setAttribute("src", src)
    // El.src=src

    // console.log(`FIXED IMAGE # ${imgEl} `,ReadAbleFile)

}
const renderImages = () => {
    const files = filess && Array.from(filess)
    const defaultImg = SELECT("#defaultImg")
    const addImgBtn = SELECT("#addImgBtn")
    imgUploadInput.disabled = true;

    let numOfFiles = files.length

    if (numOfFiles < 1) {
        SELECT("#compressContainer").style.visibility = "hidden"
    } else {
        SELECT("#compressContainer").style.visibility = "visible"
    }
    if (numOfFiles > 49) {
        warning.innerHTML = `<b style="font-weight:bold; color:red;">WARNING:</b><br/> 
                               <span style="padding:10px;text-align:left">
                               Your processor/computer may not be able to process ${numOfFiles} Images at once, We recommend selecting less than 50 Images at once for better performance.
                                </span>
                                `;
    }
    addImgBtn.innerHTML = `LOADING.....`
    if (defaultImg && numOfFiles > 0) 
        defaultImg.remove();
    

    setTimeout(() => {

        if (files && numOfFiles > 0) {
            let displayImages = SELECT("#displayImages")
            displayImages.innerHTML = ""
            files ?. forEach((file, i) => {
                let divEl = document.createElement("div")
                let imgEl = document.createElement("img")
                imgEl.src = file.path

                imgEl.id = `PNG_${i}_${
                    btoa(file.name)
                }`
                divEl.className = "displayedImg"

                imgEl.setAttribute("onclick", `document.getElementById('ImageView').src=this.src`)

                const a = document.createElement("a")
                a.appendChild(imgEl)

                a.setAttribute("href", `#ViewImage`)
                a.className = "perfundo__link"

                divEl.appendChild(a)

                divEl.className = "displayedImg perfundo"

                displayImages.appendChild(divEl)

                if (i == files.length - 1) {
                    warning.innerHTML = "";
                    updateNumOfImages();
                }
                imgEl.onerror = () => setImgBase64(imgEl, file) // converting to base64 only on error, this make performance better and help us avoid freezes. (before this i was converting all images to base64 wither errored or not that was making computer freez)
            })
            addImgBtn.innerHTML = "+ Add MORE"
            imgUploadInput.disabled = false
            findDuplicate()
        }

    }, 0);
}

const hasDuplicate=()=>{
    let FileNames = [... filess.map(f => f.name)]
    let duplicateFiles = filess.filter((file, i) => FileNames.indexOf(file.name) !== i)

    return {FileNames,duplicateFiles,FilesLength:duplicateFiles.length}
}
const findDuplicate = (forceAlert = false) => {
    if (filess && filess.length) {
        let {FileNames} = hasDuplicate()
        let {duplicateFiles} = hasDuplicate()
        if (duplicateFiles.length) { // alert(``)

            let countFiles = duplicateFiles.length
            let fileStr = countFiles > 1 ? "files" : "file"
            console.log("result from removeDup=> ", filess, " \n dupfilename=> ", FileNames, " \n dupfiles=> ", duplicateFiles)

            let shouldNotAsk = localStorage.getItem("NeverAsk")
            let msg = `You've selected ${
                countFiles > 1 ? countFiles : "a"
            } duplicate ${fileStr}`
            let duplInner = `<span style='color:red'> 
                               <b>WARNING</b>
                               <p style="margin:0px;line-height:1">  ${msg} .  <button onClick="findDuplicate(true)" type="button"  class="btn btn-danger btn-rounded  btn-sm">REMOVE DUPLICATE</button></p>
                              </span>`
            if (! shouldNotAsk || forceAlert) {
                swal("DUPLICATE FILES DETECTED", `${msg} , Would you like to un-select duplicate ${fileStr} having same name?`, {
                    icon: 'warning',
                    dangerMode: true,
                    buttons: {
                        cancel: true,
                        ...forceAlert ? {} : {
                            never: "Never Ask"
                        },
                        confirm: "Yes !"
                    }
                }).then((Yes) => {
                    if (Yes == "never") {
                        localStorage.setItem("NeverAsk", true)
                        warning.innerHTML=duplInner

                    } else if (Yes) {
                        removeDuplicates()

                    }
                })
            } else {
                warning.innerHTML=duplInner
            }
        }

    }
}

const removeDuplicates = (showAlert=true) => {
    
    let {FileNames} = hasDuplicate()
    let {duplicateFiles} = hasDuplicate()
    let duplicateFileNames = duplicateFiles.map(f => f.name)
    let uniqueFiles = filess.filter((file) => ! duplicateFileNames.includes(file.name))
    filess = [
        ... uniqueFiles,
        ... duplicateFiles
    ]

    console.log("result from removeDup=> ", filess, " \n filename=> ", FileNames, " \n dupfiles=> ", duplicateFiles, "\n unique fil=> ", uniqueFiles)
    renderImages()
    if(showAlert){
    swal("DONE", "Removed Duplicate Files ", {icon: 'success'}).then(() =>{ 
        renderImages()
        setTimeout(() => {
             let hasDuplicateFiles = hasDuplicate().FilesLength
             if(hasDuplicate){//Re-check if any duplicate files left after the current removal process. 
                 removeDuplicates(false) //Re-run the function to remove remaining. false will make sure that this alert does not show and the loop does not continue.
             }
             renderImages()

        }, 10);
    
    })
   }
}



const updateNumOfImages = () => {
    warning.innerHTML = `
                <span style="text-align:left; color:green">
                        Selected ${
        filess.length
    } Image(s)
                 </span>
                 `;
}

const compressNow = () => {
    ipcRenderer.send("image:compress", filess)
    // alert("WOW")
}

CompressBtn.addEventListener("click", compressNow)

imgUploadInput.addEventListener("change", (e) => {
    let SelectedFiles = e.target.files

    if (SelectedFiles && SelectedFiles.length) {
        filess = [
            ... filess,
            ... SelectedFiles
        ]
        renderImages()
    }
})
// SELECT("#imgUploadInput").addEventListener("drop",(e)=>console.log("DROP=> ",e))

更新:-
我替换了这个:

const compressNow = () => {

        ipcRenderer.send("image:compress",filess)
    
}

变成这样:

const compressNow = () => {

    filess.forEach(file => {
        ipcRenderer.send("image:compress",file.path )
    });
}

现在我通过forEach一个接一个的发送文件,实际上是它的发送字符串“file path”,所以这就是它的工作方式,我仍然很困惑为什么我必须这样做?为什么我不能发送整个fileList,我假设这个循环方法是一个坏的做法,因为它会消耗更多的CPU,它是一个额外的循环,但是如果我能够发送整个数组,它就没有必要了。

1sbrub3j

1sbrub3j1#

参见行为变更:通过IPC发送非JS对象现在抛出异常。DOM对象等不可序列化。当发送不可序列化对象时,Electron 9.0(及更新版本)抛出“对象无法克隆”错误。
在您的代码中,FileFileList是DOM对象。
如果你想避免使用forEach,试试下面的代码:

const compressNow = () => {
    const paths = filess.map(f => f.path);
    ipcRenderer.send("image:compress", paths);
}
zmeyuzjn

zmeyuzjn2#

可以参考电子github问题跟踪器了解此问题(已关闭)

Error: An object could not be cloned #26338
ipcRenderer.send的文档(通道、...参数)
这个问题主要出现在我们通过IPC发送的数据中的对象内有不可克隆的值(如函数)时,为了避免在发送前使用JSON.stringify(),在接收端稍后使用JSON.parse(),但这样做会导致丢失一些值,例如:

const obj = {
 x :10,
 foo : ()=>{
    console.log('This is non-cloneable value')
 }
}

console.log(JSON.stringify(obj))

输出:{“x”:10}

z9ju0rcb

z9ju0rcb3#

不发送图像,而是将其保存在fs中并发送路径

hwamh0ep

hwamh0ep4#

在窗口中的JSON.stringify()在main.js中的JSON.parse()

u0njafvf

u0njafvf5#

从. .send方法中删除:compress并尝试

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