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+# Memo source development notes
+## 1. Project introduction
+The Memo app is a pre-built app in OpenHarmony that allows users to edit and save text.
+
+## 2. Engineering structure
+### directory structure
+```
+/applications/standard/note
+├─common
+│  ├─component
+│  │  └─src
+│  │      └─main
+│  │          ├─ets
+│  │          │  └─default                        # Basic Interface Components
+│  │          └─resources                         # Directory for storing resource configuration files
+│  └─utils
+│      └─src
+│          └─main
+│              ├─ets
+│              │  └─default
+│              │      ├─baseUtil                  # data processing
+│              │      ├─constants                 # constant definition
+│              │      └─model
+│              │          ├─databaseModel         # data format definitions
+│              │          └─searchModel           # Search for data format definitions
+│              └─resources                        # Directory for storing resource configuration files
+├─figures                                         # readme of the file
+└─product
+    ├─phone
+    │  └─src
+    │      └─main
+    │          ├─ets
+    │          │  └─MainAbility
+    │          │      ├─pages                     # Mobile home page Settings
+    │          │      └─res                       # Preset image
+    │          └─resources                        # resource file
+    └─tablet
+        └─src
+            └─main
+                ├─ets
+                │  └─MainAbility
+                │      ├─pages                    # Tablet home page Settings
+                │      └─res                      # Preset image
+                └─resources                       # resource file
+```
+
+### Overall architecture
+
+![](./figures/note.png)
+
+## 3. Signature packing  
+###  Sign
+#### Obtain the signature file  
+1.   Generate the signature file may refer to https://gitee.com/openharmony/docs/blob/master/zh-cn/application-dev/quick-start/configuring-openharmony-app-signature.md
+
+#### Configure the signature file
+Open the Project and select File → Project Structure
+
+![](./figures/signature_1.png)
+
+Go to Modules → Signing Configs and configure the corresponding signature file as follows, then click Apply and then OK.
+The password is the password used to generate the signature file. If the default signature file is used, the default password 123456 is used.
+
+![](./figures/signature_2.png)
+
+After the configuration is complete, the following information is displayed in the build.gradle file
+
+![](./figures/signature_3.png)
+
+### packaging
+
+1. Choose Build → Build Haps(s)/APP(s) → Build Hap(s)
+
+![](./figures/ds_build_haps.png)
+
+2. Once compiled, hap packages will be generated in the 'build\outputs\hap\release' path of the project directory (if no signature is configured, only unsigned HAP packages will be generated)
+
+  ![](./figures/ds_ohosbuild_output_dir_release.png)
+
+## 4. Installation and debugging
+
+### Install the app
+
+Connect the device to the computer through the debug line, the linked device is displayed on the IDE, click the Start button to install and pull up the application:
+ 
+![](./figures/install.png)
+
+### App debug
+
+#### log printing
+
+- Add log to the program
+
+```JS
+console.info("note log info");
+```
+
+You can view the log in DevEco Studio
+
+![](./figures/ds_hilog_window.png)
+
+#### Obtain and filter logs
+
+- log for
+
+Configure the hdC_std environment variables and export the log to a file
+
+![](./figures/hdc_std.png)
+
+```
+hdc_std shell hilog > Output file name
+```
+
+Example:View logs in the real environment and output all logs to the hilog.log file in the current directory
+
+```
+hdc_std shell hilog > hilog.log
+```
+
+- log filter
+
+Filter logs in the command line window
+
+```
+Hilog | grep filtering information
+```
+
+Example: Filter the HILOG that contains information Label
+
+```
+hilog | grep Label
+```
+
+
-- 
Gitee