把应用沙箱下的图片保存到图库

import fs from '@ohos.file.fs'; 
import picker from '@ohos.file.picker'; 
import { BusinessError } from '@ohos.base';
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async ()=>{ 
            let uris:String = "" 
            try { 
              const photoSaveOptions = new picker.PhotoSaveOptions(); // 创建文件管理器保存选项实例 
              photoSaveOptions.newFileNames = ["PhotoViewPicker01.png"]; // 保存文件名（可选），方括号里的文件名自定义，每次不能重复，设备里已有这个文件的话，名字就需要改个不一样的，不然接口会报错 
              const photoViewPicker = new picker.PhotoViewPicker(); 
              try { 
                let photoSaveResult = await photoViewPicker.save(photoSaveOptions); 
                if (photoSaveResult != undefined) { 
                  uris = photoSaveResult[0]; 
                  console.info('photoViewPicker.save to file succeed and uris are:' + uris); 
                } 
              } catch (error) { 
                let err: BusinessError = error as BusinessError; 
                console.error(`[picker] Invoke photoViewPicker.save failed, code is ${err.code}, message is ${err.message}`); 
              } 
            } catch (error) { 
              let err: BusinessError = error as BusinessError; 
              console.info("[picker] photoViewPickerSave error = " + JSON.stringify(err)); 
            } 
            try{ 
              let path = getContext().filesDir+"/test.jpg" //需要保存的图片的路径 
  
              let file = fs.openSync(path) 
              let file2 = fs.openSync(uris+"",fs.OpenMode.READ_WRITE) 
              fs.copyFileSync(file.fd,file2.fd) 
              fs.closeSync(file) 
              fs.closeSync(file2) 
            }catch (error) { 
              let err: BusinessError = error as BusinessError; 
              console.error(`[picker] Invoke photoViewPicker.save failed, code is ${err.code}, message is ${err.message}`); 
            } 
          })
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