func (s *CIService) Get(ctx context.Context, key string, operation string, opt *ObjectGetOptions, id ...string) (*Response, error)

func (s *CIService) GetToFile(ctx context.Context, key, localpath, operation string, opt *ObjectGetOptions, id ...string) (*Response, error)

name := "test.jpg"
// Case 1 从响应体中获取对象
resp, err := c.CI.Get(context.Background(), name, "imageMogr2/thumbnail/!50px", nil)
if err != nil {
    //ERROR
}
defer resp.Body.Close()
ioutil.ReadAll(resp.Body)

// Case 2 下载对象到文件
filepath := "test.jpg"
_, err = c.CI.GetToFile(context.Background(), name, filepath, "imageMogr2/thumbnail/!50px", nil)

name := "test.jpg"
filepath := "test.jpg"
_, err = c.CI.GetToFile(context.Background(), name, filepath, "imageMogr2/cut/600x600x100x10", nil)

name := "test.jpg"
filepath := "test.jpg"
_, err = c.CI.GetToFile(context.Background(), name, filepath, "imageMogr2/rotate/90", nil)