压缩和解压缩字符串放气 [英] zip and unzip string with Deflate

问题描述

喜 我需要压缩和解压缩字符串

Hi I need to zip and unzip string

下面是code：

    public static byte[] ZipStr(String str)
{
    using (MemoryStream output = new MemoryStream())
    using (DeflateStream gzip = new DeflateStream(output, CompressionMode.Compress))
    using (StreamWriter writer = new StreamWriter(gzip))
       {
                writer.Write(str);
                return output.ToArray();
       }
}

和

public static string UnZipStr(byte[] input)
{
    using (MemoryStream inputStream = new MemoryStream(input))
    using (DeflateStream gzip = new DeflateStream(inputStream, CompressionMode.Decompress))
    using (StreamReader reader = new StreamReader(gzip))
       {
        reader.ReadToEnd();
        return System.Text.Encoding.UTF8.GetString(inputStream.ToArray());
       }
}

似乎没有在UnZipStr方法错误。有人可以帮我吗？

It seems that there is error in UnZipStr method. Can somebody help me?

推荐答案

有两个独立的问题。首先，在 ZipStr 你需要刷新或关闭的StreamWriter 和关闭 DeflateStream的阅读前的MemoryStream 。

There are two separate problems. First of all, in ZipStr you need to flush or close the StreamWriter and close the DeflateStream before reading from the MemoryStream.

其次， UnZipStr ，你构建从COM pressed字节你的结果字符串的InputStream 。你应该返回的结果 reader.ReadToEnd（）代替。

Secondly, in UnZipStr, you're constructing your result string from the compressed bytes in inputStream. You should be returning the result of reader.ReadToEnd() instead.

这也将是指定的的StreamWriter 和的StreamReader 构造函数的字符串编码是个好主意。

It would also be a good idea to specify the string encoding in the StreamWriter and StreamReader constructors.

请尝试以下code来代替：

Try the following code instead:

public static byte[] ZipStr(String str)
{
    using (MemoryStream output = new MemoryStream())
    {
        using (DeflateStream gzip = 
          new DeflateStream(output, CompressionMode.Compress))
        {
            using (StreamWriter writer = 
              new StreamWriter(gzip, System.Text.Encoding.UTF8))
            {
                writer.Write(str);           
            }
        }

        return output.ToArray();
    }
}

public static string UnZipStr(byte[] input)
{
    using (MemoryStream inputStream = new MemoryStream(input))
    {
        using (DeflateStream gzip = 
          new DeflateStream(inputStream, CompressionMode.Decompress))
        {
            using (StreamReader reader = 
              new StreamReader(gzip, System.Text.Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }
    }
}

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