HarmonyOS Image加载本地图片咨询

import fs from '@ohos.file.fs'; 
import { resourceManager } from '@kit.LocalizationKit'; 
import { image } from '@kit.ImageKit'; 
import { fileUri } from '@kit.CoreFileKit'; 
@Entry 
@Component 
struct FunAPage { 
  @State message: string = 'Hello funA'; 
  @State filePath:string = '' 
  @State imageUri:string = '' 
  @State pixelMap:image.PixelMap  | undefined = undefined 
  aboutToAppear(): void { 
    this.setImageUriToFile() 
  } 
  setImageUriToFile(){ 
    let context = getContext(this); 
    let filePath = context.filesDir + '/test.png'; 
    //文件的字节数据，该处可替换为其他各种来源的字节数据 
    let arrayBuff = context.resourceManager.getRawFileContentSync('food.png').buffer 
    let file = fs.openSync(filePath,fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE) 
    fs.writeSync(file.fd,arrayBuff) 
    fs.closeSync(file.fd) 
    this.filePath = filePath 
  } 
  getImageUri(){ 
    this.imageUri = fileUri.getUriFromPath(this.filePath) 
  } 
  async getPixelMapByImage():Promise<image.PixelMap>{ 
    const context : Context = getContext(this); 
    // 获取resourceManager资源管理器 
    const resourceMgr : resourceManager.ResourceManager = context.resourceManager; 
    let rawFileDescriptor = await resourceMgr.getRawFd('food.png') 
    const imageSource : image.ImageSource = image.createImageSource(rawFileDescriptor); 
    let decodingOptions : image.DecodingOptions = { 
      editable: true, 
      desiredPixelFormat: 3, 
    } 
    // 创建pixelMap并进行简单的旋转和缩放 
    const pixelMap:image.PixelMap = await imageSource.createPixelMap(decodingOptions) 
    this.pixelMap =  pixelMap 
    return pixelMap; 
  } 
  build() { 
    Row() { 
      Column() { 
        Button('uri图片展示') 
          .onClick(()=>{ 
            this.getImageUri() 
          }) 
        Image(this.imageUri) 
          .width(200) 
          .height(200) 
        Button('pixelMap图片展示') 
          .onClick(()=>{ 
            this.getPixelMapByImage() 
          }) 
        Image(this.pixelMap) 
          .width(200) 
          .height(200) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}