1# FAQs About Application Packages 2<!--Kit: Ability Kit--> 3<!--Subsystem: BundleManager--> 4<!--Owner: @wanghang904--> 5<!--Designer: @hanfeng6--> 6<!--Tester: @kongjing2--> 7<!--Adviser: @Brilliantry_Rui--> 8 9## How do i obtain the fingerprint in the signature information? 10 11* Call an API. 12 13You can call [bundleManager.getBundleInfoForSelf](../reference/apis-ability-kit/js-apis-bundleManager.md#bundlemanagergetbundleinfoforself) to obtain the bundle information, which contains the signature information, and signature information in turn contains fingerprint information. 14 15```ts 16import { bundleManager } from '@kit.AbilityKit'; 17import { BusinessError } from '@kit.BasicServicesKit'; 18import { hilog } from '@kit.PerformanceAnalysisKit'; 19 20let bundleFlags = bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION | bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_SIGNATURE_INFO; 21try { 22 bundleManager.getBundleInfoForSelf(bundleFlags).then((bundleInfo:bundleManager.BundleInfo) => { 23 console.info('testTag', 'getBundleInfoForSelf successfully. fingerprint: %{public}s', bundleInfo.signatureInfo.fingerprint); 24 }).catch((err: BusinessError) => { 25 console.error('testTag', 'getBundleInfoForSelf failed. Cause: %{public}s', err.message); 26 }); 27} catch (err) { 28 let message = (err as BusinessError).message; 29 console.error('testTag', 'getBundleInfoForSelf failed: %{public}s', message); 30} 31``` 32 33* Use [Bundle Manager](../tools/bm-tool.md) (bm). 34 35```shell 36hdc shell 37# Replace **com.example.myapplication** with the actual bundle name. 38bm dump -n com.example.myapplication | grep fingerprint 39``` 40 41 42 43* Use the **keytool**. For details, see [Generating a Signing Certificate Fingerprint](https://developer.huawei.com/consumer/en/doc/AppGallery-connect-Guides/appgallerykit-preparation-game-0000001055356911#section147011294331). 44 45## What is appIdentifier? 46 47**appIdentifier**, generated during application signing, is a field in the [profile](https://developer.huawei.com/consumer/en/doc/app/agc-help-add-releaseprofile-0000001914714796) and is the unique identifier of an application. There are two ways to generate an application identifier: 481. The **appIdentifier** field is randomly generated through [automatic signing](https://developer.huawei.com/consumer/en/doc/harmonyos-guides/ide-signing#section18815157237) on DevEco Studio. Signing on different devices or re-signing will result in different values of **appIdentifier**. 492. The **appIdentifier** field in the [debug profile](https://developer.huawei.com/consumer/en/doc/app/agc-help-debug-profile-0000002248181278) or [release profile](https://developer.huawei.com/consumer/en/doc/app/agc-help-release-profile-0000002248341090) is fixed if you manually sign and request a profile in AppGallery Connect. This field comes from the [App ID](https://developer.huawei.com/consumer/en/doc/app/agc-help-createharmonyapp-0000001945392297) generated when the application is created in AppGallery Connect and is distributed by the cloud. In this case, the **appIdentifier** field does not change along the application lifecycle, including version updates, certificate changes, public and private key changes, and application transfers. 50 51Therefore, manual signing is recommended in scenarios where **appIdentifier** must remain unchanged, such as cross-device debugging, cross-application interaction debugging, or multi-user development with a shared key. For details, see [Use Cases for Automatic and Manual Signing](https://developer.huawei.com/consumer/en/doc/harmonyos-guides/ide-signing#section54361623194519). 52 53## How do I obtain appidentifier from application information? 54 55* You can call [bundleManager.getBundleInfoForSelf](../reference/apis-ability-kit/js-apis-bundleManager.md#bundlemanagergetbundleinfoforself) to obtain the bundle information, which contains the signature information, and signature information in turn contains the **appIdentifier**. 56 57```ts 58import { bundleManager } from '@kit.AbilityKit'; 59import { BusinessError } from '@kit.BasicServicesKit'; 60import { hilog } from '@kit.PerformanceAnalysisKit'; 61 62let bundleFlags = bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_APPLICATION | bundleManager.BundleFlag.GET_BUNDLE_INFO_WITH_SIGNATURE_INFO; 63try { 64 bundleManager.getBundleInfoForSelf(bundleFlags).then((bundleInfo:bundleManager.BundleInfo) => { 65 console.info('testTag', 'getBundleInfoForSelf successfully. appIdentifier: %{public}s', bundleInfo.signatureInfo.appIdentifier); 66 }).catch((err: BusinessError) => { 67 console.error('testTag', 'getBundleInfoForSelf failed. Cause: %{public}s', err.message); 68 }); 69} catch (err) { 70 let message = (err as BusinessError).message; 71 console.error('testTag', 'getBundleInfoForSelf failed: %{public}s', message); 72} 73``` 74 75* Use the [bm](../tools/bm-tool.md) tool. 76 77```shell 78hdc shell 79# Replace **com.example.myapplication** with the actual bundle name. 80bm dump -n com.example.myapplication | grep appIdentifier 81``` 82 83 84
