コード例 #1
0
        /// 下载对象
        public void GetObject()
        {
            //.cssg-snippet-body-start:[get-object]
            try
            {
                string           bucket        = "examplebucket-1250000000";   //存储桶,格式:BucketName-APPID
                string           key           = "exampleobject";              //对象键
                string           localDir      = System.IO.Path.GetTempPath(); //本地文件夹
                string           localFileName = "my-local-temp-file";         //指定本地保存的文件名
                GetObjectRequest request       = new GetObjectRequest(bucket, key, localDir, localFileName);
                //设置进度回调
                request.SetCosProgressCallback(delegate(long completed, long total)
                {
                    Console.WriteLine(String.Format("progress = {0:##.##}%", completed * 100.0 / total));
                });
                //执行请求
                GetObjectResult result = cosXml.GetObject(request);
                //请求成功
                Console.WriteLine(result.GetResultInfo());
            }
            catch (COSXML.CosException.CosClientException clientEx)
            {
                //请求失败
                Console.WriteLine("CosClientException: " + clientEx);
            }
            catch (COSXML.CosException.CosServerException serverEx)
            {
                //请求失败
                Console.WriteLine("CosServerException: " + serverEx.GetInfo());
            }

            //.cssg-snippet-body-end
        }
コード例 #2
0
        public async Task GetObjectAsync(string bucketName, string objectName, Action <Stream> callback, CancellationToken cancellationToken = default)
        {
            if (string.IsNullOrEmpty(bucketName))
            {
                throw new ArgumentNullException(nameof(bucketName));
            }
            if (string.IsNullOrEmpty(objectName))
            {
                throw new ArgumentNullException(nameof(objectName));
            }
            if (!await ObjectsExistsAsync(bucketName, objectName))
            {
                throw new Exception($"Object '{objectName}' not in bucket '{bucketName}'");
            }
            bucketName = ConvertBucketName(bucketName);

            await Task.Run(() =>
            {
                GetObjectBytesRequest request = new GetObjectBytesRequest(bucketName, objectName);
                //执行请求
                GetObjectBytesResult result = _client.GetObject(request);
                //获取内容
                byte[] content = result.content;
                if (content != null && content.Length > 0)
                {
                    MemoryStream ms = new MemoryStream(content);
                    callback(ms);
                }
                else
                {
                    throw new Exception("Get object bytes is null.");
                }
            }, cancellationToken);
        }
コード例 #3
0
        public void Get(string remotename, Stream stream)
        {
            try
            {
                cosXml = GetCosXml();
                string bucket = _cosOptions.Bucket;
                string key    = GetFullKey(remotename);

                GetObjectBytesRequest request = new GetObjectBytesRequest(bucket, key);

                request.SetSign(TimeUtils.GetCurrentTime(TimeUnit.SECONDS), KEY_DURATION_SECOND);

                GetObjectBytesResult result = cosXml.GetObject(request);

                byte[] bytes = result.content;

                Stream ms = new MemoryStream(bytes);
                Utility.Utility.CopyStream(ms, stream);
            }
            catch (COSXML.CosException.CosClientException clientEx)
            {
                Logging.Log.WriteErrorMessage(LOGTAG, "Get", clientEx, "Get failed: {0}", remotename);
                throw;
            }
            catch (COSXML.CosException.CosServerException serverEx)
            {
                Logging.Log.WriteErrorMessage(LOGTAG, "Get", serverEx, "Get failed: {0}, {1}", remotename, serverEx.GetInfo());
                throw;
            }
        }
コード例 #4
0
        /// 下载时添加盲水印
        public void DownloadObjectWithWatermark()
        {
            string bucket        = "examplebucket-1250000000";   //存储桶,格式:BucketName-APPID
            string key           = "exampleobject";              //对象键
            string localDir      = System.IO.Path.GetTempPath(); //本地文件夹
            string localFileName = "my-local-temp-file";         //指定本地保存的文件名
            //.cssg-snippet-body-start:[download-object-with-watermark]
            GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, key, localDir, localFileName);

            //处理参数,规则参见:https://cloud.tencent.com/document/product/460/19017
            getObjectRequest.SetQueryParameter("watermark/3/type/<type>/image/<imageUrl>/text/<text>", null);

            GetObjectResult result = cosXml.GetObject(getObjectRequest);
            //.cssg-snippet-body-end
        }
コード例 #5
0
        /// 获取预签名下载链接
        public void GetPresignDownloadUrl()
        {
            //.cssg-snippet-body-start:[get-presign-download-url]
            try
            {
                PreSignatureStruct preSignatureStruct = new PreSignatureStruct();
                preSignatureStruct.appid              = "1250000000";               //腾讯云账号 APPID
                preSignatureStruct.region             = "COS_REGION";               //存储桶地域
                preSignatureStruct.bucket             = "examplebucket-1250000000"; //存储桶
                preSignatureStruct.key                = "exampleobject";            //对象键
                preSignatureStruct.httpMethod         = "GET";                      //HTTP 请求方法
                preSignatureStruct.isHttps            = true;                       //生成 HTTPS 请求 URL
                preSignatureStruct.signDurationSecond = 600;                        //请求签名时间为600s
                preSignatureStruct.headers            = null;                       //签名中需要校验的 header
                preSignatureStruct.queryParameters    = null;                       //签名中需要校验的 URL 中请求参数

                string requestSignURL = cosXml.GenerateSignURL(preSignatureStruct);

                //下载请求预签名 URL (使用永久密钥方式计算的签名 URL)
                string           localDir      = System.IO.Path.GetTempPath(); //本地文件夹
                string           localFileName = "my-local-temp-file";         //指定本地保存的文件名
                GetObjectRequest request       = new GetObjectRequest(null, null, localDir, localFileName);
                //设置下载请求预签名 URL
                request.RequestURLWithSign = requestSignURL;
                //设置进度回调
                request.SetCosProgressCallback(delegate(long completed, long total)
                {
                    Console.WriteLine(String.Format("progress = {0:##.##}%", completed * 100.0 / total));
                });
                //执行请求
                GetObjectResult result = cosXml.GetObject(request);
                //请求成功
                Console.WriteLine(result.GetResultInfo());
            }
            catch (COSXML.CosException.CosClientException clientEx)
            {
                //请求失败
                Console.WriteLine("CosClientException: " + clientEx);
            }
            catch (COSXML.CosException.CosServerException serverEx)
            {
                //请求失败
                Console.WriteLine("CosServerException: " + serverEx.GetInfo());
            }

            //.cssg-snippet-body-end
        }