# Removing Assets (C/C++)

## Available APIs

You can use [OH_Asset_Remove](../../reference/apis-asset-store-kit/capi-asset-api-h.md#oh_asset_remove) to remove an asset.

The following table describes the asset attributes.

>**NOTE**
>
>In the following table, the attributes starting with **ASSET_TAG_DATA_LABEL** are custom asset attributes reserved. These attributes are not encrypted. Therefore, do not put personal data in these attributes.

| Attribute Name (Asset_Tag)           | Attribute Content (Asset_Value)                                      | Mandatory| Description                                            |
| ------------------------------- | ------------------------------------------------------------ | -------- | ------------------------------------------------ |
| ASSET_TAG_ALIAS                 | Type: uint8[]<br>Length: 1-256 bytes                              | No    | Asset alias, which uniquely identifies an asset.           |
| ASSET_TAG_ACCESSIBILITY         | Type: uint32_t<br>Value range: see [Asset_Accessibility](../../reference/apis-asset-store-kit/capi-asset-type-h.md#asset_accessibility).| No    | Access control based on the lock screen status.                                    |
| ASSET_TAG_REQUIRE_PASSWORD_SET  | Type: bool                                                  | No    | Whether the asset is accessible only when a lock screen password is set. The value **true** means the asset is accessible only when a lock screen password is set. The value **false** means that the asset can be accessed regardless of whether a lock screen password is set.    |
| ASSET_TAG_AUTH_TYPE             | Type: uint32_t<br>Value range: see [Asset_AuthType](../../reference/apis-asset-store-kit/capi-asset-type-h.md#asset_authtype).| No    | Type of user authentication required for accessing the asset.                  |
| ASSET_TAG_SYNC_TYPE             | Type: uint32_t<br>Value range: see [Asset_SyncType](../../reference/apis-asset-store-kit/capi-asset-type-h.md#asset_synctype).| No    | Type of sync supported by the asset.                          |
| ASSET_TAG_IS_PERSISTENT         | Type: bool                                                  | No    | Whether to retain the asset when the application is uninstalled. The value **true** means to retain the asset even after the application is uninstalled. The value **false** means the opposite.             |
| ASSET_TAG_DATA_LABEL_CRITICAL_1 | Type: uint8[]<br>Length: 1-2048 bytes                          | No    | Asset attribute information customized by the service with integrity protection.<br>**NOTE**: The data length is 1 to 512 bytes before API version 12.|
| ASSET_TAG_DATA_LABEL_CRITICAL_2 | Type: uint8[]<br>Length: 1-2048 bytes                          | No    | Asset attribute information customized by the service with integrity protection.<br>**NOTE**: The data length is 1 to 512 bytes before API version 12.|
| ASSET_TAG_DATA_LABEL_CRITICAL_3 | Type: uint8[]<br>Length: 1-2048 bytes                          | No    | Asset attribute information customized by the service with integrity protection.<br>**NOTE**: The data length is 1 to 512 bytes before API version 12.|
| ASSET_TAG_DATA_LABEL_CRITICAL_4 | Type: uint8[]<br>Length: 1-2048 bytes                          | No    | Asset attribute information customized by the service with integrity protection.<br>**NOTE**: The data length is 1 to 512 bytes before API version 12.|
| ASSET_TAG_DATA_LABEL_NORMAL_1   | Type: uint8[]<br>Length: 1-2048 bytes                          | No    | Asset attribute information customized by the service without integrity protection.<br>**NOTE**: The data length is 1 to 512 bytes before API version 12.|
| ASSET_TAG_DATA_LABEL_NORMAL_2   | Type: uint8[]<br>Length: 1-2048 bytes                          | No    | Asset attribute information customized by the service without integrity protection.<br>**NOTE**: The data length is 1 to 512 bytes before API version 12.|
| ASSET_TAG_DATA_LABEL_NORMAL_3   | Type: uint8[]<br>Length: 1-2048 bytes                          | No    | Asset attribute information customized by the service without integrity protection.<br>**NOTE**: The data length is 1 to 512 bytes before API version 12.|
| ASSET_TAG_DATA_LABEL_NORMAL_4   | Type: uint8[]<br>Length: 1-2048 bytes                          | No    | Asset attribute information customized by the service without integrity protection.<br>**NOTE**: The data length is 1 to 512 bytes before API version 12.|
| ASSET_TAG_DATA_LABEL_NORMAL_LOCAL_1<sup>12+</sup> | Type: uint8[]<br>Length: 1-2048 bytes| No| Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.|
| ASSET_TAG_DATA_LABEL_NORMAL_LOCAL_2<sup>12+</sup> | Type: uint8[]<br>Length: 1-2048 bytes| No| Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.|
| ASSET_TAG_DATA_LABEL_NORMAL_LOCAL_3<sup>12+</sup> | Type: uint8[]<br>Length: 1-2048 bytes| No| Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.|
| ASSET_TAG_DATA_LABEL_NORMAL_LOCAL_4<sup>12+</sup> | Type: uint8[]<br>Length: 1-2048 bytes| No| Local attribute information about the asset. The value is assigned by the service without integrity protection and will not be synced.|
| ASSET_TAG_REQUIRE_ATTR_ENCRYPTED<sup>14+</sup> | Type: bool| No| Whether to remove the encrypted data of service customized supplementary information. The value **true** means to remove the encrypted data of service customized supplementary information; the value **false** means to remove the non-encrypted data of service customized supplementary information. Default value: **false**.|
| ASSET_TAG_GROUP_ID<sup>18+</sup> | Type: Uint8[]<br>Length: 7-127 bytes| No| Group to which the asset to be removed belongs. By default, this parameter is not specified.|

## Example

Remove asset **demo_alias**.

For details about how to remove an asset in a group, see [Removing an Asset from a Group](asset-native-group-access-control.md#removing-an-asset-from-a-group).

1. Link the dynamic libraries in the CMake script.
   ```txt
   target_link_libraries(entry PUBLIC libasset_ndk.z.so)
   ```

2. Remove an asset.
   ```c
   #include <string.h>

   #include "asset/asset_api.h"

   void RemoveAsset() {
      static const char *ALIAS = "demo_alias";
      Asset_Blob alias = { (uint32_t)(strlen(ALIAS)), (uint8_t *)ALIAS };

      Asset_Attr attr[] = {
         { .tag = ASSET_TAG_ALIAS, .value.blob = alias }, // You can specify the asset alias to remove a single asset. To remove all assets, leave the alias unspecified.
      };

      int32_t ret = OH_Asset_Remove(attr, sizeof(attr) / sizeof(attr[0]));
      if (ret == ASSET_SUCCESS) {
         // Asset removed successfully.
      } else {
         // Failed to remove Asset.
      }
   }
   ```