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+# File Access on the Native Side
+
+### Overview
+
+On the native side, three major types of files are accessed: app sandbox files, app resource files, and common directory files. This sample provides implementation solutions for accessing the three types of files.
+
+### Preview
+
+| Home page of the app                                                             |
+|----------------------------------------------------------------------------------|
+| ![NativeFileAccess_show.en.png](screenshots/device/NativeFileAccess_show.en.png) |
+
+### How to Use
+
+There are six buttons on the page, which correspond to different scenarios of file access.
+- Tap any of the first three buttons. A dialog box is displayed, which shows the content of the accessed file.
+- Tap the fourth button to start the picker and create a file.
+- Tap the fifth button to start the picker and select a file. The file operation result is returned.
+- Tap the sixth button to start the picker and select a file. The file content is returned.
+
+### Project Directory
+
+```
+├──entry/src/main/cpp                 // Native layer
+│  ├──types                           // Interfaces exposed by the native layer
+│  │  └──libfile_access               // Interfaces exposed to the UI layer
+│  ├──CMakeLists.txt                  // Compilation entry
+│  └──FileAccessMethods.cpp           // Native file operation methods
+├──ets                                // UI layer
+│  ├──common                          // Common modules
+│  │  └──utils                        // Common utilities
+│  │     ├──FileOperate.ets           // File operation methods of invoking the picker
+│  │     ├──Logger.ets                // Logger
+│  │     └──ReadFile.ets              // File reading methods on the ArkTS side
+│  ├──entryability                    // App entry
+│  │  └──EntryAbility.ets
+│  ├──entrybackupability
+│  │  └──EntryBackupAbility.ets
+│  ├──model
+│  │  └──FileNameModel.ets
+│  └──pages                           // Pages contained in the EntryAbility
+│     └──Index.ets                    // Home page of the app
+├──resources                          // Static resources of the app
+│  ├──base                            // Resource files in this directory are assigned unique IDs.
+│  │  ├──element                      // Fonts and colors
+│  │  ├──media                        // Images
+│  │  └──profile                      // Home page of the app entry
+│  ├──en_US                           // Resources in this directory are preferentially matched when the device language is American English.
+│  ├──rawfile                         // Resource files of the app
+│  └──zh_CN                           // Resources in this directory are preferentially matched when the device language is simplified Chinese.
+└──module.json5                       // Module configuration
+```
+
+### How to Implement
+
+- App sandbox files can be accessed by passing paths or concatenating paths. The NAPI is called to pass parameters and the C standard API is used to access files.
+- App resource files can be accessed through resource objects on the native side by passing the resource manager.
+- Common directory files can be accessed through **fd** passed by the picker by calling the C standard API.
+
+### Permissions
+
+- N/A
+
+### Dependencies
+
+- N/A
+
+### Constraints
+
+1. The sample is only supported on Huawei phones with standard systems.
+
+2. The HarmonyOS version must be HarmonyOS 5.0.0 Release or later.
+
+3. The DevEco Studio version must be DevEco Studio 5.0.0 Release or later.
+
+4. The HarmonyOS SDK version must be HarmonyOS 5.0.0 Release SDK or later.
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