DeflateStream在MemoryStream上不起作用吗? [英] DeflateStream doesnt work on MemoryStream?
本文介绍了DeflateStream在MemoryStream上不起作用吗?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有以下代码:
MemoryStream resultStream = new MemoryStream();
string users = ""//Really long string goes here
BinaryFormatter bFormatter = new BinaryFormatter();
using (MemoryStream assignedUsersStream = new MemoryStream())
{
bFormatter.Serialize(assignedUsersStream, users);
assignedUsersStream.Position = 0;
using (var compressionStream =
new DeflateStream(resultStream, CompressionLevel.Optimal))
{
assignedUsersStream.CopyTo(compressionStream);
Console.WriteLine("Compressed from {0} to {1} bytes.",
assignedUsersStream.Length.ToString(),
resultStream.Length.ToString());
}
}
问题是resultStream
始终为空!
我在做什么错了?
推荐答案
将验证WriteLine置于使用范围之外.缓冲区尚未刷新.
Put your verification WriteLine outside of the using. The buffers haven't been flushed yet.
using (DeflateStream compressionStream = new DeflateStream(resultStream, CompressionLevel.Optimal))
{
assignedUsersStream.CopyTo(compressionStream);
//Console.WriteLine("Compressed from {0} to {1} bytes.",
// assignedUsersStream.Length.ToString(), resultStream.Length.ToString());
}
Console.WriteLine("Compressed from {0} to {1} bytes.",
assignedUsersStream.Length, resultStream.ToArray().Length);
此外,您不需要在写行中包含所有这些ToString()
.
And aside, you don't need all those ToString()
s in a writeline.
PS:BinaryFormatter对字符串所做的全部工作是写入具有长度前缀的字节.如果不需要前缀(我的猜测),它可能变为:
PS: All a BinaryFormatter does with a string is write the bytes with length prefix. If you don't need the prefix (my guess), it could become:
string users = "";//Really long string goes here
byte[] result;
using (MemoryStream resultStream = new MemoryStream())
{
using (DeflateStream compressionStream = new DeflateStream(resultStream,
CompressionLevel.Optimal))
{
byte[] inBuffer = Encoding.UTF8.GetBytes(users);
compressionStream.Write(inBuffer, 0, inBuffer.Length);
}
result = resultStream.ToArray();
}
相反也很容易,但是您需要估计最大长度才能创建读取缓冲区:
The reverse is just as easy but you'll need an estimate of the maximum length to create the read-buffer:
string users2 = null;
using (MemoryStream resultStream = new MemoryStream(result))
{
using (DeflateStream compressionStream = new DeflateStream(resultStream,
CompressionMode.Decompress))
{
byte[] outBuffer = new byte[2048]; // need an estimate here
int length = compressionStream.Read(outBuffer, 0, outBuffer.Length);
users2 = Encoding.UTF8.GetString(outBuffer, 0, length);
}
}
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