[英]C# GZipStream suddenly not working
我使用GZipStream已有一段时间,没有任何问题。 我没有在函数中更改任何代码,但是现在压缩和解压缩不起作用。 我提取了以下简单示例(也许我一般做错了什么……)。
public static class ZipLib
{
#region Public Methods
public static string Unzip(byte[] compressedText)
{
try {
byte[] gzBuffer = compressedText;
int msgLength = BitConverter.ToInt32(gzBuffer, 0);
byte[] buffer = new byte[msgLength];
using (MemoryStream ms = new MemoryStream()) {
ms.Write(gzBuffer, 4, gzBuffer.Length - 4);
using (GZipStream zip = new GZipStream(ms, CompressionMode.Decompress, true)) {
zip.Read(buffer, 0, buffer.Length);
}
}
return Encoding.UTF8.GetString(buffer);
}
catch (Exception ex) {
Debug.WriteLine(ex.Message);
}
return "";
}
public static byte[] Zip(string text)
{
byte[] buffer = Encoding.UTF8.GetBytes(text);
MemoryStream ms = new MemoryStream();
using (GZipStream zip = new GZipStream(ms, CompressionMode.Compress, true)) {
zip.Write(buffer, 0, buffer.Length);
}
ms.Position = 0;
byte[] compressed = new byte[ms.Length];
ms.Read(compressed, 0, compressed.Length);
byte[] gzBuffer = new byte[compressed.Length + 4];
Buffer.BlockCopy(compressed, 0, gzBuffer, 4, compressed.Length);
Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gzBuffer, 0, 4);
return gzBuffer;
}
#endregion
}
internal class Program
{
#region Private Methods
private static void Main(string[] args)
{
string uncompressedIn = "Hallo Welt";
var compressed = ZipLib.Zip(uncompressedIn);
var uncompressed = ZipLib.Unzip(compressed);
Console.WriteLine("Uncompressed Input: " + uncompressedIn);
Console.WriteLine("Compressed value: " + string.Join(" | ", compressed));
Console.WriteLine("Uncompressed from compressed: " + string.Join(" | ", uncompressed.ToCharArray()));
Console.ReadKey();
}
#endregion
}
uncompressed
值为"\\0\\0\\0\\0"
...
在Unzip
,您可以Write
MemoryStream
,然后将其提供给GZipStream
进行读取,但是:它仍然位于流的末尾,因此您没有倒带。 尝试添加:
ms.Position = 0;
Write
。 但是请注意,这样做可能会更有效:
using(MemoryStream ms = new MemoryStream(gzBuffer, 4, gzBuffer.Length - 4))
{
//...
}
这样可以避免重复存储
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