harmony 鸿蒙Removing Assets (C/C++)

2025-06-12
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Removing Assets (C/C++)

Available APIs

You can use OH_Asset_Remove to remove assets. If the asset alias is specified, the specified asset will be removed. If no asset alias is specified, all assets will be removed.

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[] Length: 1-256 bytes	No	Asset alias, which uniquely identifies an asset.
ASSET_TAG_ACCESSIBILITY	Type: uint32_t Value range: see 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.
ASSET_TAG_AUTH_TYPE	Type: uint32_t Value range: see Asset_AuthType	No	Type of user authentication required for accessing the asset.
ASSET_TAG_SYNC_TYPE	Type: uint32_t Value range: see 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.
ASSET_TAG_DATA_LABEL_CRITICAL_1	Type: uint8[] Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
ASSET_TAG_DATA_LABEL_CRITICAL_2	Type: uint8[] Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
ASSET_TAG_DATA_LABEL_CRITICAL_3	Type: uint8[] Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
ASSET_TAG_DATA_LABEL_CRITICAL_4	Type: uint8[] Length: 1-2048 bytes	No	Asset attribute information customized by the service with integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
ASSET_TAG_DATA_LABEL_NORMAL_1	Type: uint8[] Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
ASSET_TAG_DATA_LABEL_NORMAL_2	Type: uint8[] Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
ASSET_TAG_DATA_LABEL_NORMAL_3	Type: uint8[] Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
ASSET_TAG_DATA_LABEL_NORMAL_4	Type: uint8[] Length: 1-2048 bytes	No	Asset attribute information customized by the service without integrity protection. NOTE: The data length is 1 to 512 bytes before API version 12.
ASSET_TAG_DATA_LABEL_NORMAL_LOCAL_1¹²⁺	Type: uint8[] 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_2¹²⁺	Type: uint8[] 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_3¹²⁺	Type: uint8[] 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_4¹²⁺	Type: uint8[] 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_ENCRYPTED¹⁴⁺	Type: bool	No	Whether to remove the customized asset attribute information that is encrypted. By default, the unencrypted, customized asset attribute information is removed.
ASSET_TAG_GROUP_ID¹⁸⁺	Type: Uint8[] 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.

Add the dynamic library in the CMake script.

target_link_libraries(entry PUBLIC libasset_ndk.z.so)

Add an asset. “`c #include

#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 }, // 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.
  }

} “`