在C＃中使用Gzipstream类解压缩.gz文件 [英] Unzip .gz file using Gzipstream class in C#

问题描述

请一些人请帮助我。我必须解压缩.gz文件。 ziped文件为33 MB，压缩后的文件大约为3GB。我写了下面的代码，能够解压缩只有256 kb的文件。

Hi ,

Couls some one please help me . I have to unzip a .gz file. The ziped file is of 33 MB and after zip it will be around 3GB . I have written the below code and able to unzip the file of only 256 kb.

public static void Main()

        {

            string path = @"\\lousqlwis18\Ftproot\CGXRPT2\Predictive_Score";



            DirectoryInfo inf = new DirectoryInfo(path);



            foreach (FileInfo f in inf.GetFiles())

            {

                if (f.Name.ToString() == "TEST.dat.gz")

                {

                    decomp(f);

                }

            }



        }

        public static void decomp(FileInfo fi)

        {

            long i=0;long c;

            using (FileStream inFile = fi.OpenRead())

            {



                string curFile = fi.FullName;

                string origName = curFile.Remove(curFile.Length - fi.Extension.Length);





                using (FileStream outFile = File.Create(origName))

                {

                    using (GZipStream Dc = new GZipStream(inFile,

                            CompressionMode.Decompress))

                    {



                        byte[] buffer = new byte[10240];

                        int numRead;

                        while ((numRead = Dc.Read(buffer, 0, buffer.Length)) != 0)

                        {

                            outFile.Write(buffer, 0, numRead);

                            Console.Write(outFile.Length.ToString());

                            Console.Write(numRead.ToString());

                            c=(numRead+i);

                            Console.WriteLine(c.ToString());

                        }

                        Console.WriteLine("Decompressed: {0}", fi.Name);



                    }

                }

            }

        }

谢谢，

Preetpal

Thanks,
Preetpal

推荐答案

它只是我吗？或者你是否比你需要的内环更难



我想的是像

is it just me ? or are you making the inner loop much harder than you need

I was thinking of something like

using (GZipStream Dc = new GZipStream(inFile,                            CompressionMode.Decompress))
    {
        Dc.CopyTo(outFile);
    }

来自http://blogs.msdn.com/b/bclteam/archive/2005/06/15/429542.aspx [ ^ ]

from http://blogs.msdn.com/b/bclteam/archive/2005/06/15/429542.aspx[^]

private static void Compress(Stream source, Stream destination)
{
    // We must explicitly close the output stream, or GZipStream will not
    // write the compression's footer to the file.  So we'll get a file, but
    // we won't be able to decompress it.  We'll get back 0 bytes.
    using(GZipStream output = new GZipStream(destination, CompressionMode.Compress)) {
        Pump(source, output);
    }
}


private static void Decompress(Stream source, Stream destination)
{
    using(GZipStream input = new GZipStream(source, CompressionMode.Decompress)) {
        Pump(input, destination);
    }
}


private static void Pump(Stream input, Stream output)
{
    byte[] bytes = new byte[4096];
    int n;
    while((n = input.Read(bytes, 0, bytes.Length)) != 0) {
        output.Write(bytes, 0, n);
    }
}

...

...

String inputFileName = @"fully qualified path to input file";
String outputFileName = @"fully qualified path to output file";

// no checks/tidyups done on itput/output file(s)

Stream src = null;
Stream dest = null;
dest = File.Create(outputFileName);
using(src = File.OpenRead(inputFleName)) {
    using(dest)
    {
        Decompress(src, dest);
    }
}

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