Question

我有文件（来自第三方）正在FTP到我们服务器上的目录。我下载它们并处理它们甚至'x'分钟。效果很好。

现在，有些文件是.zip个文件。这意味着我无法处理它们。我需要先解压缩它们。

FTP没有zip / unzipping的概念 - 所以我需要抓取zip文件，解压缩然后处理它。

查看MSDN zip api，我似乎无法解压缩到内存流？

这是唯一的方法......

解压缩到一个文件（什么目录？需要一些非常临时的位置......）
阅读文件内容
删除文件。

注意：文件的内容很小 - 例如4k＆lt; - ＆gt; 1000K。

Answer 1

Zip压缩支持内置于：

using System.IO;
using System.IO.Compression;
// ^^^ requires a reference to System.IO.Compression.dll
static class Program
{
    const string path = ...
    static void Main()
    {
        using(var file = File.OpenRead(path))
        using(var zip = new ZipArchive(file, ZipArchiveMode.Read))
        {
            foreach(var entry in zip.Entries)
            {
                using(var stream = entry.Open())
                {
                    // do whatever we want with stream
                    // ...
                }
            }
        }
    }
}

通常你应该避免将其复制到另一个流中 - 只需“按原样”使用它，但是，如果你在MemoryStream中绝对需要，你可以这样做：

using(var ms = new MemoryStream())
{
    stream.CopyTo(ms);
    ms.Position = 0; // rewind
    // do something with ms
}

Answer 2

您可以使用ZipArchiveEntry.Open来获取信息流。

此代码假定zip存档有一个文本文件。

using (FileStream fs = new FileStream(path, FileMode.Open))
using (ZipArchive zip = new ZipArchive(fs) )
{
    var entry = zip.Entries.First();

    using (StreamReader sr = new StreamReader(entry.Open()))
    {
        Console.WriteLine(sr.ReadToEnd());
    }
}

Answer 3

看起来这就是你需要的：

   using (var za = ZipFile.OpenRead(path))
   {
       foreach (var entry in sa.Entries)
       {
                using (var r = new StreamReader(entry.Open()))
                {
                    //your code here
                }
       }
   }

Answer 4

  using (ZipArchive archive = new ZipArchive(webResponse.GetResponseStream()))
      {
      foreach (ZipArchiveEntry entry in archive.Entries)
          {
          Stream s = entry.Open();
          var sr = new StreamReader(s);
          var myStr = sr.ReadToEnd();
          }
      }

Answer 5

好吧，结合以上所有内容，假设您想以一种非常简单的方式获取一个名为 “ file.zip”并将其解压缩到“ C：\ temp”文件夹。（注意：此示例仅针对压缩文本文件进行了测试）您可能需要对二进制文件进行一些修改。

        using System.IO;
        using System.IO.Compression;

        static void Main(string[] args)
        {
            //Call it like this:
            Unzip("file.zip",@"C:\temp");
        }

        static void Unzip(string sourceZip, string targetPath)
        {
            using (var z = ZipFile.OpenRead(sourceZip))
            {
                foreach (var entry in z.Entries)
                {                    
                    using (var r = new StreamReader(entry.Open()))
                    {
                        string uncompressedFile = Path.Combine(targetPath, entry.Name);
                        File.WriteAllText(uncompressedFile,r.ReadToEnd());
                    }
                }
            }

        }

Answer 6

您可以在各种其他库中使用SharpZipLib来实现此目的。

您可以使用以下代码示例解压缩到MemoryStream，as shown on their wiki：

using ICSharpCode.SharpZipLib.Zip;

// Compresses the supplied memory stream, naming it as zipEntryName, into a zip,
// which is returned as a memory stream or a byte array.
//
public MemoryStream CreateToMemoryStream(MemoryStream memStreamIn, string zipEntryName) {

    MemoryStream outputMemStream = new MemoryStream();
    ZipOutputStream zipStream = new ZipOutputStream(outputMemStream);

    zipStream.SetLevel(3); //0-9, 9 being the highest level of compression

    ZipEntry newEntry = new ZipEntry(zipEntryName);
    newEntry.DateTime = DateTime.Now;

    zipStream.PutNextEntry(newEntry);

    StreamUtils.Copy(memStreamIn, zipStream, new byte[4096]);
    zipStream.CloseEntry();

    zipStream.IsStreamOwner = false;    // False stops the Close also Closing the underlying stream.
    zipStream.Close();          // Must finish the ZipOutputStream before using outputMemStream.

    outputMemStream.Position = 0;
    return outputMemStream;

    // Alternative outputs:
    // ToArray is the cleaner and easiest to use correctly with the penalty of duplicating allocated memory.
    byte[] byteArrayOut = outputMemStream.ToArray();

    // GetBuffer returns a raw buffer raw and so you need to account for the true length yourself.
    byte[] byteArrayOut = outputMemStream.GetBuffer();
    long len = outputMemStream.Length;
}

如何将文件解压缩到.NET内存流？

6 个答案: