private isFileAvailable(path?: string): boolean {if (!path) {  this.onResult(ResultType.error, "the file path cannot be null");  return false;}this.filePath = this.processPath(path);let file: fileIo.File | undefined;try {  file = fileIo.openSync(this.filePath, fileIo.OpenMode.READ_ONLY);  if (file) {fileIo.closeSync(file);return true;  }} catch (e) {  Log.e(TAG, `readImage failed:${JSON.stringify(e)}`);}this.onResult(ResultType.fileNotFound, "the " + this.filePath + " file does not exists");return false;  }

  private processPath(path: string): string {if (path.includes(FILE_PROTOCOL_HEADER)) {  return path}if (path.substring(0, 1) == "/") {  return "file:/" + path}return "file://" + path  }

  private getFileType(filePath: string): string {let fileTypeStr: string = filePath.substring(filePath.lastIndexOf('.') + 1);this.getWantAction(fileTypeStr)if (AllType.has(fileTypeStr)) {  return AllType.get(fileTypeStr)!} else {  return "*/*";}  }

   private startAbility() {const want: Want = this.getWantInfo(this.filePath);let type: number = ResultType.done;let message: string = "done";try {  this.ability?.context.startAbility(want);} catch (error) {  let e = error as BusinessError;  Log.i(TAG, `startAbility failed:${JSON.stringify(e)}`);  if (e.code = CAN_NOT_MATCH_ANY_COMPONENT) {type = ResultType.noAppToOpen;message = "No APP found to open this file。";  } else {type = ResultType.error;message = "File opened incorrectly。";  }}this.onResult(type, message);  }
  private getWantInfo(path: string): Want {let want: Want;if (this.isMediaStorePath(path)) {  want = {bundleName: HARMONY_OS_PHOTOS_BUNDLE_NAME,abilityName: HARMONY_OS_PHOTOS_ABILITY_NAME,action: OHOS_WANT_ACTION_VIEW_DATA,parameters: {  uri: path}  }} else {  want = {flags: wantConstant.Flags.FLAG_AUTH_WRITE_URI_PERMISSION | wantConstant.Flags.FLAG_AUTH_READ_URI_PERMISSION,action: this.action,uri: path,type: this.typeString,  };}return want;  }

   private onResult(type: number, message: string) {if (this.result != null && !this.isResultSubmitted) {  let map: HashMap<string, string> = new HashMap()  map.set('type', type.toString())  map.set('message', message)  let obj: Record<string, string> = {};  map.forEach((value: string, key: string) => {obj[key] = value;  })  this.result.success(JSON.stringify(obj));  this.isResultSubmitted = true;}  }