harmony 鸿蒙授权持久化(C/C++)

2025-06-12
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授权持久化(C/C++)

场景介绍

应用通过Picker获取临时授权，临时授权在应用退出后或者设备重启后会清除。如果应用重启或者设备重启后需要直接访问之前已访问过的文件，则对文件进行持久化授权。FileShare提供了支持基于uri的文件及目录授于持久化权限、权限激活、权限查询等方法。

接口说明

接口的详细介绍请参见API参考。

接口名称	描述
OH_FileShare_PersistPermission(const FileShare_PolicyInfo policies, unsigned int policyNum, FileShare_PolicyErrorResult result, unsigned int resultNum)	对所选择的多个文件或目录uri持久化授权。
OH_FileShare_RevokePermission(const FileShare_PolicyInfo policies, unsigned int policyNum, FileShare_PolicyErrorResult result, unsigned int resultNum)	对所选择的多个文件或目录uri取消持久化授权。
OH_FileShare_ActivatePermission(const FileShare_PolicyInfo policies, unsigned int policyNum, FileShare_PolicyErrorResult result, unsigned int resultNum)	使能多个已经永久授权过的文件或目录uri。
OH_FileShare_DeactivatePermission(const FileShare_PolicyInfo policies, unsigned int policyNum, FileShare_PolicyErrorResult result, unsigned int resultNum)	取消使能授权过的多个文件或目录uri。
OH_FileShare_CheckPersistentPermission(const FileShare_PolicyInfo policies, unsigned int policyNum, bool result, unsigned int resultNum)	校验所选择的多个文件或目录uri的持久化权限结果。
OH_FileShare_ReleasePolicyErrorResult(FileShare_PolicyErrorResult *errorResult, unsigned int resultNum)	释放FileShare_PolicyErrorResult内存。

约束与限制

使用文件分享的相关接口，需确认设备具有以下系统能力：SystemCapability.FileManagement.AppFileService.FolderAuthorization。
在调用文件分享的相关接口前，需要申请权限：”ohos.permission.FILE_ACCESS_PERSIST”，申请方式请参考访问控制-申请应用权限。

开发步骤

以下步骤描述了如何使用FileShare提供的Native API接口。

添加动态链接库

CMakeLists.txt中添加以下lib。

target_link_libraries(sample PUBLIC libohfileshare.so)

头文件

#include <filemanagement/fileshare/oh_file_share.h>
#include <iostream>

创建FileShare_PolicyInfo实例,调用OH_FileShare_PersistPermission接口，设置uri的持久化授权，接口入参policyNum最大上限为500。 c++ static const uint32_t POLICY_NUM = 2; char strTestPath1[] = "file://com.example.fileshare/data/storage/el2/base/files/test1.txt"; char strTestPath2[] = "file://com.example.fileshare/data/storage/el2/base/files/test2.txt"; FileShare_PolicyInfo policy[POLICY_NUM] = { {strTestPath1, static_cast<unsigned int>(strlen(strTestPath1)), FileShare_OperationMode::READ_MODE}, {strTestPath2, static_cast<unsigned int>(strlen(strTestPath2)), FileShare_OperationMode::WRITE_MODE}}; FileShare_PolicyErrorResult* result = nullptr; uint32_t resultNum = 0; auto ret = OH_FileShare_PersistPermission(policy, POLICY_NUM, &result, &resultNum); if (ret != ERR_OK) { if (ret == ERR_EPERM && result != nullptr) { for(uint32_t i = 0; i < resultNum; i++) { std::cout << "error uri: " << result[i].uri << std::endl; std::cout << "error code: " << result[i].code << std::endl; std::cout << "error message: " << result[i].message << std::endl; } } } OH_FileShare_ReleasePolicyErrorResult(result, resultNum);
调用OH_FileShare_ActivatePermission接口，激活启用已授权过的uri，接口入参policyNum最大上限为500。 c++ auto ret = OH_FileShare_ActivatePermission(policy, POLICY_NUM, &result, &resultNum); if (ret != ERR_OK) { if (ret == ERR_EPERM && result != nullptr) { for(uint32_t i = 0; i < resultNum; i++) { std::cout << "error uri: " << result[i].uri << std::endl; std::cout << "error code: " << result[i].code << std::endl; std::cout << "error message: " << result[i].message << std::endl; } } } OH_FileShare_ReleasePolicyErrorResult(result, resultNum);
调用OH_FileShare_DeactivatePermission接口，停止已启用授权过uri的访问权限，接口入参policyNum最大上限为500。 c++ auto ret = OH_FileShare_DeactivatePermission(policy, POLICY_NUM, &result, &resultNum); if (ret != ERR_OK) { if (ret == ERR_EPERM && result != nullptr) { for(uint32_t i = 0; i < resultNum; i++) { std::cout << "error uri: " << result[i].uri << std::endl; std::cout << "error code: " << result[i].code << std::endl; std::cout << "error message: " << result[i].message << std::endl; } } } OH_FileShare_ReleasePolicyErrorResult(result, resultNum);
调用OH_FileShare_RevokePermission接口，撤销已经授权的uri持久化权限，接口入参policyNum最大上限为500。 c++ auto ret = OH_FileShare_RevokePermission(policy, POLICY_NUM, &result, &resultNum); if (ret != ERR_OK) { if (ret == ERR_EPERM && result != nullptr) { for(uint32_t i = 0; i < resultNum; i++) { std::cout << "error uri: " << result[i].uri << std::endl; std::cout << "error code: " << result[i].code << std::endl; std::cout << "error message: " << result[i].message << std::endl; } } } OH_FileShare_ReleasePolicyErrorResult(result, resultNum);
调用OH_FileShare_CheckPersistentPermission接口，检查uri持久化权限，接口入参policyNum最大上限为500。 c++ bool *result = nullptr; auto ret = OH_FileShare_CheckPersistentPermission(policy, POLICY_NUM, &result, &resultNum); if (result != nullptr && resultNum > 0) { for(uint32_t i = 0; i < resultNum && resultNum <= POLICY_NUM; i++) { std::cout << "uri: " << policy[i].uri << std::endl; std::cout << "result: " << result[i] << std::endl; } } std::cout << "retCode: " << ret << std::endl; free(result);