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Cloud Object Storage
DocumentationCloud Object StorageSDK DocumentationSDK for FlutterDemo
Demo
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Last updated: 2024-02-02 14:40:45
Demo
Last updated: 2024-02-02 14:40:45
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Background

Apps are the building blocks of the mobile internet, and they often require massive data uploads and downloads. Therefore, data security and reliability are crucial. Developers can let Tencent Cloud COS handle data storage, and can focus on their app business logics to reduce workload and improve development efficiency. This document describes how to quickly build a COS-based app transfer service to upload and download app data on Tencent Cloud COS. All you need to do is deploy your businesses and generate and manage temporary keys on your server.
COS provides a demo, which you can run as instructed below.

Resources

Download the demo from the repository on GitHub.

Preparations

System version: Android 4.1 and later or iOS 11 and later.
Your temporary key server or permanent key (SecretId and SecretKey can be obtained from the Manage API Key page in the Tencent Cloud console).
Tencent Cloud APPID (if you need to try out the bucket adding feature).

Setting up Your Client

Configuring the client

1. Download the project files from GitHub and open them in your IDE.
2. Create config.dart as instructed in the example/lib/config/config.template file and modify relevant values.
3. Run your project to try out the demo.
Note:
We recommend you use a temporary key as instructed in Generating and Using Temporary Keys to call the SDK for security purposes. When you apply for a temporary key, follow the Notes on Principle of Least Privilege to avoid leaking resources besides your buckets and objects.
If you must use a permanent key, do not expose the plaintext of SecretId and SecretKey to unsecured environments, and we recommend that you follow the Notes on Principle of Least Privilege to limit the scope of permission on the permanent key.

Running the Demo

Querying a bucket list

Open the sample app, and you will see all the buckets that you have created.

Creating a bucket

Click +Create Bucket in the top-right corner to open the configuration page, enter the bucket name and select the bucket region.

Querying an object list

Click a bucket, and you will see all the files and folders that it contains.

Uploading an object

On the file list page, click Upload in the top-right corner and select the file to be uploaded.

Downloading an object

In the object list, click Download below a file to download it.
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