使用7zip SDK压缩文件，但不能使用Winrar或7zip解压缩 [英] using 7zip sdk to compress a file, but can not decompress using winrar or 7zip

问题描述

我从此处下载了SDK 7zip。

I downloaded the SDK 7zip from here.

然后我使用以下代码将文件压缩为7zip：

Then I used this code to compress a file to 7zip:

private static void CompressFileLZMA(string inFile, string outFile)
{
    Encoder coder = new SevenZip.Compression.LZMA.Encoder();

    using (FileStream input = new FileStream(inFile, FileMode.Open))
    using (FileStream output = new FileStream(outFile, FileMode.Create))
    {
        coder.Code(input, output, -1, -1, null);
        output.Flush();
    }
}

我尝试了SDK版本9.20和9.22 beta

I tried both the SDK versions 9.20 and 9.22 beta on the site.

压缩似乎可以将我的文件从1.6 MB压缩到239 KB。

The compression seems working to compress my file from: 1.6 MB to 239 KB.

但是，如果我使用WinRar或7zip解压缩。他们无法识别存档文件，错误就像

However, if I use WinRar or 7zip to decompress. the archive file is not recognized by them, the error is like

未知的存档文件或损坏的文件

"unknown archive file or damaged file"

对此有任何想法吗？

推荐答案

您可以尝试使用 7zSharp包装器或至少分析包装器代码如何完成所有工作。

You can try to use 7zSharp wrapper or at least analyze wrappers code how everything is done.

压缩文件的代码（取自7zSharp）：

Code to compress file(taken from 7zSharp):

  public void EncodeSingleFile(string inFile, string outFile)
  {
     using (FileStream inStream = new FileStream(inFile, FileMode.Open, FileAccess.Read))
     {
        using (FileStream outStream = new FileStream(outFile, FileMode.OpenOrCreate, FileAccess.Write))
        {
           EncodeSingleFile(inStream, outStream);
        }
     }
  }

  public void EncodeSingleFile(FileStream inStream, FileStream outStream)
  {
     bool eos = false;
     Int32 dictionary = 1 << 21;
     Int32 posStateBits = 2;
     Int32 litContextBits = 3; // for normal files
     // UInt32 litContextBits = 0; // for 32-bit data
     Int32 litPosBits = 0;
     // UInt32 litPosBits = 2; // for 32-bit data
     Int32 algorithm = 2;
     Int32 numFastBytes = 128;
     string mf = "bt4";

     propIDs = new CoderPropID[]
        {
           CoderPropID.DictionarySize,
           CoderPropID.PosStateBits,
           CoderPropID.LitContextBits,
           CoderPropID.LitPosBits,
           CoderPropID.Algorithm,
           CoderPropID.NumFastBytes,
           CoderPropID.MatchFinder,
           CoderPropID.EndMarker
        };
     properties = new object[]
        {
           dictionary,
           posStateBits,
           litContextBits,
           litPosBits,
           algorithm,
           numFastBytes,
           mf,
           eos
        };

     Encoder encoder = new Encoder();
     encoder.SetCoderProperties(propIDs, properties);
     encoder.WriteCoderProperties(outStream);
     Int64 fileSize = inStream.Length;
     for (int i = 0; i < 8; i++)
     {
        outStream.WriteByte((Byte) (fileSize >> (8*i)));
     }
     encoder.Code(inStream, outStream, -1, -1, null);
  }

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