木子屋
 

标题: GZipStream压缩/解压字符串改进版(C#)

作者: dnawo

日期: 2009-12-25 10:38 AM

分类: Web编程

内容: 复制内容到剪贴板 程序代码//using System.IO;
//using System.IO.Compression;
/// <summary>
/// GZipStream压缩字符串
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
static Stream GZipCompress(string str)
{
    MemoryStream msReturn;
    using (MemoryStream msTemp = new MemoryStream())
    {
        using (GZipStream gz = new GZipStream(msTemp, CompressionMode.Compress, true))
        {
            using (BinaryWriter writer = new BinaryWriter(gz))
            {
                writer.Write(Encoding.UTF8.GetBytes(str));
            }
            gz.Close();
            msReturn = new MemoryStream(msTemp.GetBuffer(), 0, (int)msTemp.Length);
        }
    }
    return msReturn;
}
/// <summary>
/// GZipStream解压字符串
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
static string GZipDecompress(Stream stream)
{
    using (GZipStream gz = new GZipStream(stream, CompressionMode.Decompress))
    {
        using (StreamReader reader = new StreamReader(gz, Encoding.UTF8))
        {
            return reader.ReadToEnd();
        }
    }
}
测试中发现问题：
·GZipCompress方法中使用StreamWriter则无法往gz写入内容；
·GZipCompress方法中msReturn先初始化再复制msTemp时，一定要将当前流位置设置为0，否则解压不出内容：
复制内容到剪贴板 程序代码static Stream GZipCompress(string str)
{
    MemoryStream msReturn = new MemoryStream();
    using (MemoryStream msTemp = new MemoryStream())
    {
        using (GZipStream gz = new GZipStream(msTemp, CompressionMode.Compress, true))
        {
            using (BinaryWriter writer = new BinaryWriter(gz))
            {
                writer.Write(Encoding.UTF8.GetBytes(str));
            }
            gz.Close();
            msReturn.Write(msTemp.GetBuffer(), 0, (int)msTemp.Length);
            msReturn.Seek(0, SeekOrigin.Begin);//非常重要
        }
    }
    return msReturn;
}

+ 查看当前日志评论 (0)

 

登录

────────────

木子屋

PJBlog3 v3.2.9.518 Inside.

Processed In 0.047 ms

标题: GZipStream压缩/解压字符串改进版(C#)

你没有权限发表评论

────────────

木子屋

PJBlog3 v3.2.9.518 Inside.

Processed In 0.047 ms

暂无评论

返回

────────────

木子屋

PJBlog3 v3.2.9.518 Inside.

Processed In 0.047 ms