### Download Files with UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet provides examples for downloading files from UFile. It covers both standard file download and streaming download, demonstrating the use of the `Download` method.

```go
// 加载配置，创建请求
config, err := ufsdk.LoadConfig("config.json")
if err != nil {
	panic(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
	panic(err.Error())
}
// 普通下载
err = req.Download("DownLoadURL")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
// 流式下载
err = req.Download("buffer", "KeyName")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
```

--------------------------------

### Perform Multipart Upload with UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet shows how to perform a standard multipart upload using the `MPut` method of the UFile Go SDK. It loads configuration, creates a file request, and initiates the upload.

```go
// 加载配置，创建请求
config, err := ufsdk.LoadConfig("config.json")
if err != nil {
	panic(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
	panic(err.Error())
}

err = req.MPut("FilePath", "KeyName", "MimeType")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
```

--------------------------------

### Query File Metadata with UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet shows how to retrieve basic information and metadata about a file stored in UFile using the `HeadFile` method. It initializes the SDK and makes a request for file headers.

```go
config, err := ufsdk.LoadConfig("config.json")
if err != nil {
	panic(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
	panic(err.Error())
}
err = req.HeadFile("KeyName")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
```

--------------------------------

### Perform Form Upload with UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet demonstrates how to perform a form-based file upload using the UFile Go SDK. It initializes the SDK with a configuration file, creates a new file request, and then uploads a file using `PostFile`.

```go
// 加载配置，创建请求
config, err := ufsdk.LoadConfig("config.json")
if err != nil {
	panic(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
	panic(err.Error())
}

err = req.PostFile("FilePath", "KeyName", "MimeType")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
```

--------------------------------

### Copy Files with UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet demonstrates how to copy a file within UFile, potentially between different buckets, using the `Copy` method. It specifies the destination key, source bucket, and source key.

```go
config, err := ufsdk.LoadConfig("config.json")
if err != nil {
	panic(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
	panic(err.Error())
}
err = req.Copy("DstkeyName", "SrcBucketName", "SrcKeyName")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
```

--------------------------------

### Perform Multipart Uploads with Callbacks using UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet demonstrates various multipart upload methods that support callbacks: synchronous (`MPutWithPolicy`), asynchronous (`AsyncMPutWithPolicy`), and asynchronous concurrent (`AsyncUploadWithPolicy`). It shows how to integrate custom policies with uploads.

```go
// 加载配置，创建请求
config, err := ufsdk.LoadConfig("config.json")
if err != nil {
	panic(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
	panic(err.Error())
}

// 同步分片上传回调
err = req.MPutWithPolicy("FilePath", "KeyName", "MimeType", "Policy")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}

// 异步分片上传回调
err = req.AsyncMPutWithPolicy("FilePath", "KeyName", "MimeType", "Policy")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}

// 异步分片并发上传回调
jobs := 20 // 并发数为 20
err = req.AsyncUploadWithPolicy("FilePath", "KeyName", "MimeType", jobs, "Policy")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
```

--------------------------------

### Perform Streaming Uploads with UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet illustrates two types of streaming uploads: for small local files using `IOPut` and for large files using `IOMutipartAsyncUpload`. It shows how to open a file and stream its content to UFile.

```go
if err != nil {
    log.Fatal(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
    log.Fatal(err.Error())
}
// 流式上传本地小文件
f, err := os.Open("FilePath")
if err != nil {
    panic(err.Error())
}
err = req.IOPut(f, "KeyName", "")
f.Close()
if err != nil {
    log.Fatalf("%s\n", req.DumpResponse(true))
}

// 流式上传大文件
f1, err := os.Open("FilePath1")
if err != nil {
    panic(err.Error())
}
err = req.IOMutipartAsyncUpload(f1, "KeyName", "")
f1.Close()
if err != nil {
    log.Fatalf("%s\n", req.DumpResponse(true))
}
```

--------------------------------

### Compare Local and Remote File ETag with UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet shows how to compare the ETag of a local file with its corresponding remote file in UFile using the `CompareFileEtag` method. This is useful for verifying file integrity or synchronization.

```go
config, err := ufsdk.LoadConfig("config.json")
if err != nil {
	panic(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
	panic(err.Error())
}
err = req.CompareFileEtag("KeyName", "FilePath")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
```

--------------------------------

### Delete Files with UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet demonstrates how to delete a file from UFile using the `DeleteFile` method. It initializes the SDK and sends a request to remove the specified file.

```go
config, err := ufsdk.LoadConfig("config.json")
if err != nil {
	panic(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
	panic(err.Error())
}
err = req.DeleteFile("KeyName")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
```

--------------------------------

### Restore Archived Files with UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet shows how to restore an archived file in UFile using the `Restore` method. This is typically used for files stored in cold or archive storage classes to make them accessible.

```go
config, err := ufsdk.LoadConfig("config.json")
if err != nil {
	panic(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
	panic(err.Error())
}
err = req.Restore("KeyName")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
```

--------------------------------

### Change File Storage Class with UFile Go SDK

Source: https://github.com/ufilesdk-dev/ufile-gosdk/blob/master/README.md

This snippet demonstrates how to change the storage class of an existing file in UFile using the `ClassSwitch` method. This allows moving files between different storage tiers.

```go
config, err := ufsdk.LoadConfig("config.json")
if err != nil {
	panic(err.Error())
}
req, err := ufsdk.NewFileRequest(config, nil)
if err != nil {
	panic(err.Error())
}
err = req.ClassSwitch("KeyName", "StorageClass")
if err != nil {
	log.Println("DumpResponse：", string(req.DumpResponse(true)))
}
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.