info 获取是失败 一直为空

import bundleManager from '@ohos.bundle.bundleManager'; 
let bundleFlags = bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION; 
try { 
  bundleManager.getBundleInfoForSelf(bundleFlags).then((data) => { 
    hilog.info(0x0000, 'testTag', 'getBundleInfoForSelf successfully. Data: %{public}s', JSON.stringify(data)); 
  }).catch((err: BusinessError) => { 
    hilog.error(0x0000, 'testTag', 'getBundleInfoForSelf failed. Cause: %{public}s', err.message); 
  }); 
} catch (err) { 
  let message = (err as BusinessError).message; 
  hilog.error(0x0000, 'testTag', 'getBundleInfoForSelf failed: %{public}s', message); 
}