[英]C# code to GZip and upload a string to Amazon S3
我目前使用以下代码从Amazon C#中检索和解压缩字符串数据:
GetObjectRequest getObjectRequest = new GetObjectRequest().WithBucketName(bucketName).WithKey(key);
using (S3Response getObjectResponse = client.GetObject(getObjectRequest))
{
using (Stream s = getObjectResponse.ResponseStream)
{
using (GZipStream gzipStream = new GZipStream(s, CompressionMode.Decompress))
{
StreamReader Reader = new StreamReader(gzipStream, Encoding.Default);
string Html = Reader.ReadToEnd();
parseFile(Html);
}
}
}
我想反转这段代码,以便我可以压缩并将字符串数据上传到S3,而无需写入磁盘。 我尝试了以下,但我得到一个例外:
using (AmazonS3 client = Amazon.AWSClientFactory.CreateAmazonS3Client(AWSAccessKeyID, AWSSecretAccessKeyID))
{
string awsPath = AWSS3PrefixPath + "/" + keyName+ ".htm.gz";
byte[] buffer = Encoding.UTF8.GetBytes(content);
using (MemoryStream ms = new MemoryStream())
{
using (GZipStream zip = new GZipStream(ms, CompressionMode.Compress))
{
zip.Write(buffer, 0, buffer.Length);
PutObjectRequest request = new PutObjectRequest();
request.InputStream = ms;
request.Key = awsPath;
request.BucketName = AWSS3BuckenName;
using (S3Response putResponse = client.PutObject(request))
{
//process response
}
}
}
}
我得到的例外是:
无法访问封闭的Stream。
我究竟做错了什么?
编辑:
在使用的结束括号(GZipStream zip)上发生异常
堆栈跟踪:
在System.IO.MemoryStream.Write(Byte []缓冲区,Int32偏移量,Int32计数)
System.IO.Stream.Close()处的System.IO.Compress.GripStream.Dispose(布局处理)处的System.IO.Compress.DeflateStream.Dispose(布局处理)处于System.IO.Stream.Close()处。
在将其用作请求的输入之前,您需要刷新并关闭GZipStream并将MemoryStream的位置重置为0:
MemoryStream ms = new MemoryStream();
using (GZipStream zip = new GZipStream(ms, CompressionMode.Compress, true))
{
byte[] buffer = Encoding.UTF8.GetBytes(content);
zip.Write(buffer, 0, buffer.Length);
zip.Flush();
}
ms.Position = 0;
PutObjectRequest request = new PutObjectRequest();
request.InputStream = ms;
request.Key = AWSS3PrefixPath + "/" + keyName+ ".htm.gz";
request.BucketName = AWSS3BuckenName;
using (AmazonS3 client = Amazon.AWSClientFactory.CreateAmazonS3Client(
AWSAccessKeyID, AWSSecretAccessKeyID))
using (S3Response putResponse = client.PutObject(request))
{
//process response
}
如果您首先使用数据填充MemoryStream,也可以使用GZipStream作为输入,但我还没有尝试过。
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