HarmonyOS Image组件加载完成，如何在onComplete回调中拿到组件的pixelmap？

import http from '@ohos.net.http'; 
import ResponseCode from '@ohos.net.http'; 
import image from '@ohos.multimedia.image'; 
import { BusinessError } from '@ohos.base'; 
@Entry 
@Component 
struct DarkModeTest { 
  @State image: PixelMap | undefined = undefined; 
  httpRequest() { 
    http.createHttp().request( 
      "https://appimg.dbankcdn.com/substancechartimg/64/f7e291e71006440caed2f552f4dbb522.jpg", 
      (error: BusinessError, data: http.HttpResponse) => { 
        if (error) { 
          console.error(`WYXX http reqeust failed with. Code: ${error.code}, message: ${error.message}`); 
        } else { 
          console.error(`WYXX http reqeust success.`); 
          let imageData: ArrayBuffer = data.result as ArrayBuffer; 
          let imageSource: image.ImageSource = image.createImageSource(imageData); 
          console.error(`WYXX http reqeust size = ${imageData.byteLength}`); 
          class tmp { 
            height: number = 100 
            width: number = 100 
          } 
          let options: Record<string, number | boolean | tmp> = { 
            'alphaType': 0, // 透明度 
            'editable': false, // 是否可编辑 
            'pixelFormat': 3, // 像素格式 
            'scaleMode': 1, // 缩略值 
            'size': { height: 100, width: 100 } 
          } // 创建图片大小 
          imageSource.createPixelMap(options).then((pixelMap: PixelMap) => { 
            this.image = pixelMap 
          }) 
        } 
      } 
    ) 
  } 
  build() { 
    Column(){ 
      Button("获取网络图片") 
        .onClick(() => { 
          this.httpRequest() 
        }) 
      Image(this.image) 
        .height(100).width(100) 
}.backgroundColor('#CCCCCC').width('100%').height('100%') 
  } 
}