GZip解压给出空白文件

问题描述

| 给定以下代码，为什么解压缩不起作用？ \“ NewFile2.txt \”应该具有原始的，已解压缩的文本，但是文件只是空白。

ioTests.CompressFile(@\"c:\\newfile.txt\",@\"c:\\newfile.txt.gz\");
ioTests.DecompressFile(@\"c:\\newfile.txt.gz\",@\"c:\\newfile2.txt\");

public void CompressFile(string inFileName,string outFileName)
{
    FileStream inFile = new FileStream(inFileName,FileMode.Open);
    FileStream outFile = new FileStream(outFileName,FileMode.Create);

    GZipStream compStream = new GZipStream(outFile,CompressionMode.Compress);

    int theByte = inFile.ReadByte();

    while (theByte != -1)
    {
        compStream.WriteByte((byte)theByte);
        theByte = inFile.ReadByte();
    }

    compStream.Close();
}

public void DecompressFile(string inFileName,FileMode.CreateNew);

    GZipStream compStream = new GZipStream(inFile,CompressionMode.Decompress);

    int theByte = compStream.ReadByte();

    while (theByte != -1)
    {
        outFile.WriteByte((byte)theByte);

        theByte = compStream.ReadByte();
    }

    compStream.Close();
}

    

解决方法

        

outFile.Flush(); // after your loop

    ,        我更喜欢

outFile.Close() 

因为这会刷新流并调用Dispose方法，从而释放分配的资源。     ,        由于您使用的流实现了

IDisposable

接口，因此您应在

Dispose()

/

Close()

类中使用类，或使用

using

语句自动执行此操作：

    using (FileStream inFile = new FileStream(inFileName,FileMode.Open))
    using (FileStream outFile = new FileStream(outFileName,FileMode.Create))

    using (GZipStream compStream = new GZipStream(outFile,CompressionMode.Compress)) {

        int theByte = inFile.ReadByte();
        // ... Rest of your code

    }

这大致翻译为：

    try {
       FileStream inFile = new FileStream(inFileName,FileMode.Open);
       FileStream outFile = new FileStream(outFileName,FileMode.Create);
       GZipStream compStream = new GZipStream(outFile,CompressionMode.Compress);

        int theByte = inFile.ReadByte();
        // ... Rest of your code

    } finally {
        if (inFile != null) inFile.Dispose();
        if (outFile != null) outFile.Dispose();
        if (compStream != null) compStream.Dispose();
    }