鸿蒙下载图片保存到相册，截取某个组件保存到相册

鸿蒙下载图片保存到相册，截取某个组件保存到相册

import { image } from '@kit.ImageKit'
import photoAccessHelper from '@ohos.file.photoAccessHelper'
import { BusinessError } from '@kit.BasicServicesKit'
import { http } from '@kit.NetworkKit'
import fs from '@ohos.file.fs';
import { fileUri } from '@kit.CoreFileKit';
import { Context, Permissions } from '@kit.AbilityKit';
import { componentSnapshot } from '@kit.ArkUI';
import { PermissionUtil } from '../util/PermissionUtil';
import { PhotoHelper } from '../util/PhotoHelper';
import { FileUtil } from '../util/FileUtil';
import { LogUtil } from '@ohos/commonlibrary';

//保存画报到相册
function savePictorialToPhoto() {
  //TODO:
  let pixmap: image.PixelMap | undefined = undefined
  let uriStr: string = ''
  //截图，“root”是组件的id
  let pixelmap = componentSnapshot.getSync("root", { scale: 2, waitUntilRenderFinished: true })
  pixmap = pixelmap
  console.log("测试保存"+JSON.stringify(pixmap))
  //保存本地-相册
  //Dialog截图
  let ps: Permissions[] = ['ohos.permission.WRITE_IMAGEVIDEO'];
  PermissionUtil.requestPermissions(ps).then((result) => {
    if (result) {
      LogUtil.debug("测试保存"+result)
      let imgName = `海报_${new Date().getTime()}`;
      PhotoHelper.save(photoAccessHelper.PhotoType.IMAGE, 'png', { title: imgName }).then(async (uri) => {
        if (uri) {
          uriStr = `调用2保存图片，返回uris：\n${uri}`
          let file = FileUtil.openSync(uri);
          let packOpts: image.PackingOption = { format: 'image/png', quality: 100 }
          PhotoHelper.packToFileFromPixelMap(pixmap!!, file.fd, packOpts).then(() => {
            FileUtil.close(file.fd);
            console.log("测试保存成功")
          })
        }
      }).catch((err: BusinessError) => {
        uriStr = `调用保存图片，异常：\n${JSON.stringify(err)}`
      })
    } else {
      console.log("测试保存失败")
    }
  })
}

@Entry
@Component
  /**
   *首页
   */
struct CeshiPage {
  build() {
    //底部导航栏
    Column() {
      Button('测试保存相册').onClick(() => {
        this.dowImageAndSave("http://img14.360buyimg.com/imgzone/jfs/t1/317716/18/12967/150513/686749d5Fef9f99f1/eeefe1ff7bce6117.png",
          getContext())
      })
      Button('测试截图保存相册').onClick(() => {
        savePictorialToPhoto()
      })

    }
    .id("root")
    .width('100%').height('100%')
  }

  async dowImageAndSave(url: string, context: Context) {
    let phAccessHelper = photoAccessHelper.getPhotoAccessHelper(context)
    let pixelMap: PixelMap | undefined = undefined
    let packOptions: image.PackingOption = { format: 'image/jpeg', quality: 98 }
    let imagePackerApi = image.createImagePacker()
    // 下载图片到本地
    http.createHttp().request(url, {
      method: http.RequestMethod.GET,
      connectTimeout: 60000,
      readTimeout: 60000
    }, async (error: BusinessError, data: http.HttpResponse) => {
      if (error) {
        console.log(`${error.code},${error.message}`)
      } else {
        let imageData: ArrayBuffer = data.result as ArrayBuffer
        let ImageSource: image.ImageSource = image.createImageSource(imageData)
        //   创建pixelmap对象
        pixelMap = await ImageSource.createPixelMap()

        const path: string = context.cacheDir + "/save_image.jpg"
        //   写入本地
        let file = fs.openSync(path, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE)
        await imagePackerApi.packToFile(pixelMap, file.fd, packOptions)
        // 获取图片uri
        let uri = fileUri.getUriFromPath(path)
        //   复制图片到相册

        let uris: Array<string> = [uri]
        let photoCreationConfig: Array<photoAccessHelper.PhotoCreationConfig> = [
          {
            title: 'dowImg',
            fileNameExtension: 'jpg',
            photoType: photoAccessHelper.PhotoType.IMAGE,
            subtype: photoAccessHelper.PhotoSubtype.DEFAULT
          }
        ]
        //   基于弹窗授权的方式获取媒体库的目标uri
        let desFileuris: Array<string> = await phAccessHelper.showAssetsCreationDialog(uris, photoCreationConfig)
        //   将应用沙箱的照片写入媒体库
        let desFile: fs.File = await fs.open(desFileuris[0], fs.OpenMode.WRITE_ONLY) //  相册
        let srcFile: fs.File = await fs.open(uri, fs.OpenMode.READ_ONLY) // 沙箱图片
        // 沙箱图片复制到相册
        await fs.copyFile(srcFile.fd, desFile.fd).then(() => {

          fs.close(srcFile)
          fs.close(desFile)


        })
      }
    })
    //=====================
  }
}