HarmonyOS html内如何解析应用本地路径文件

论何种路径，都是先在HarmonyOS端读取文件拿到对应buffer，再通过runJavaScript() 或者 registerJavaScriptProxy()方式传递给h5，暂时无法在h5端直接调用HarmonyOS的资源路径，需要通过客户端的api读取资源再传输给h5，如以下简单例子：分别对应相册、文件管理、拍照，分段将注释删除就可以分别跑通。

1、index.ets:

import web_webview from '@ohos.web.webview'
import { common } from '@kit.AbilityKit'
import { uri, util } from '@kit.ArkTS'
import fs from '@ohos.file.fs';
import picker from '@ohos.file.picker'
import { BusinessError } from '@kit.BasicServicesKit';

class testClass {
  base64Str: string
  constructor(base64Str:string) {
    this.base64Str=base64Str;
  }

  test(): string {
    return "2123";
  }

  toString(): void {
    console.log('Web Component toString');
  }
}

@Entry
@Component
struct WebComponent {
  controller: web_webview.WebviewController = new web_webview.WebviewController()
  //定义一个全局的string类型的数组，用来存放通过picker拉起后选择完图片后图片的uri
  @State uris: Array<string> = []
  @State base64Str : string = ""
  @State testObj: testClass = new testClass(this.base64Str);
  aboutToAppear() {
    web_webview.WebviewController.setWebDebuggingAccess(true);
  }
  build() {
    Column() {

      Web({ src: $rawfile('TestonShowFileSelector.html'), controller: this.controller })
        .javaScriptAccess(true)
        .domStorageAccess(true)
        .onShowFileSelector((event) => {
          // //-------调用相册-------------------------
          console.log('MyFileUploader onShowFileSelector invoked')
          const photoSelectOptions = new picker.PhotoSelectOptions();
          // 过滤选择媒体文件类型为IMAGE_VIDEO_TYPE
          photoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_VIDEO_TYPE;
          // 选择媒体文件的最大数目
          photoSelectOptions.maxSelectNumber = 8;
          //let uris: Array<string> = [];
          const photoViewPicker = new picker.PhotoViewPicker();
          photoViewPicker.select(photoSelectOptions).then((photoSelectResult: picker.PhotoSelectResult) => {
            this.uris = photoSelectResult.photoUris;
            let file1 = fs.openSync(this.uris[0])
            let array:ArrayBuffer = new ArrayBuffer(fs.statSync(file1.fd).size)
            fs.readSync(file1.fd,array)
            let unit = new Uint8Array(array)
            let base64 = new util.Base64Helper();
            let mystr = base64.encodeToStringSync(unit);
            this.base64Str = "myFunction(\"" + mystr + "\")"
            this.controller.runJavaScript(this.base64Str)
            console.info('photoViewPicker.select to file succeed and uris are:' + this.uris);//file://media/Photo/11/IMG_1713942933_005/IMG_20240424_151353.jpg
          }).catch((err: BusinessError) => {
            console.error(`Invoke photoViewPicker.select failed, code is ${err.code}, message is ${err.message}`);
          })

          return false
          //----调用文件管理器-----------------
          // console.log('MyFileUploader onShowFileSelector invoked')
          // const documentSelectOptions = new picker.DocumentSelectOptions();
          // // 选择媒体文件的最大数目
          // documentSelectOptions.maxSelectNumber = 2;
          // const documentViewPicker = new picker.DocumentViewPicker();
          // documentViewPicker.select(documentSelectOptions).then((DocumentSelectResult: Array<string>) => {
          // this.uris = DocumentSelectResult;
          // console.info('photoViewPicker.select to file succeed and uris are:' + this.uris);
          // }).catch((err: BusinessError) => {
          // console.error(`Invoke photoViewPicker.select failed, code is ${err.code}, message is ${err.message}`);
          // })
          // return false

          ////-----相机--------------------------------
          // const context = getContext(this) as common.UIAbilityContext
          // context.startAbilityForResult({
          // action:"ohos.want.action.imageCapture",
          // parameters:{
          // callBundleName:"com.hm.imageshow"
          // }
          // }).then((res)=>{
          // console.log("testTag - " +JSON.stringify(res));
          // let str:string = res.want?.parameters!["resourceUri"] as string
          // console.log("str"+str);//file://media/Photo/11/IMG_1713942933_005/IMG_20240424_151353.jpg
          // let fd = fs.openSync(str).fd
          // this.uris[0] = str
          // let arr:ArrayBuffer = new ArrayBuffer(128)
          // fs.readSync(fd,arr)
          // console.log("testTag - " + str);
          //
          // })
          //return false

        })

    }
  }
}

2、TestonShowFileSelector.html

<!DOCTYPE html>
  <html>
  <head>
  <meta name="viewport" content="width=device-width, initial-scale=1.0" charset="utf-8">
  <script>
  function myFunction(mystr)
  {
    var img = new Image();
    img.width = 100;
    img.height = 50;
    img.src = "data:image/png;base64,"+mystr;
    document.body.appendChild(img);
    <!-- let str=objName.test()-->
  console.log(mystr)
    console.log("这部分是将ArkTS发送过来的str渲染到h5页面上，或者存在h5侧的变量中")
  }
window.onload = function() {
  // 获取文件输入元素
  var fileInput = document.getElementById('upload');

  // 监听文件输入的改变事件
  fileInput.addEventListener('change', function(e) {
    // 获取选中的文件
    var file = e.target.files[0];
    // 创建一个FileReader对象
    var reader = new FileReader();

    // 定义文件读取完成后的回调函数
    reader.onloadend = function() {
      // 获取图片元素
      var img = document.getElementById('preview');
      // 将读取到的结果赋值给图片元素的src属性
      img.src = reader.result;
    }

    // 读取文件内容
    if (file) {
      reader.readAsDataURL(file);
    }
  });
}


  </script>
  </head>
  <body>
  <form id="upload-form" enctype="multipart/form-data">
  <!-- 修改type属性为camera -->
  <input type="file" id="upload" name="upload" accept="image/*" capture="camera" />
  <!-- 添加一个图片元素用于展示图片 -->
  <img id="preview"/>
  </form>
  <div id="155134"></div>
  </body>
  </html>