GZipStream 提示不被支持

Question

http://msdn.microsoft.com/zh-cn/library/system.io.compression.gzipstream(v=vs.110).aspx

此页上注明了支持winphone8.0

但是在实际的环境中，并不能解压服务端传来的数据，请问谁能提供解决方案。

Answer 1

你好，

>>此页上注明了支持winphone8.0

因为这篇KB是机器翻译的，经过我测试，确实是在WP8中不支持，可见英文文档：

#GZipStream Class
http://msdn.microsoft.com/en-us/library/system.io.compression.gzipstream(v=vs.110).aspx

.NET for Windows Phone apps
Supported in: Windows Phone 8.1

>>但是在实际的环境中，并不能解压服务端传来的数据，请问谁能提供解决方案。

在WP8中，我们可以使用 Microsoft 官方推出的 NuGet package:

#Microsoft Compression
https://www.nuget.org/packages/Microsoft.Bcl.Compression/

它是支持WP8和WP8.1的，以下是我在WP SL 8.0 项目中的测试代码：

private void Button_Click(object sender, RoutedEventArgs e)
{
            //Read the Data From zip
            string ReadData = "";
            GZipStream instream = new GZipStream(File.OpenRead("Assets/test.gz"), CompressionMode.Decompress);

            StreamReader reader = new StreamReader(instream);

            ReadData = reader.ReadToEnd();
            reader.Close();
            txtData.Text = ReadData;
}

上面的代码是解压test.gz中的文本文件，读取出来显示到界面上:

这里还有一篇英文的文章关于如何使用这个API: http://blogs.msdn.com/b/dotnet/archive/2013/06/06/portable-compression-and-httpclient-working-together.aspx

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Answer 2

你好,我刚刚也测试了,你的这个例子可行,但是,我需要将一段byte[]进行gzip解压缩,

用这个组件转不出来,返回的内容是空的.我的想法是能否将这这个加密后的byte[]保存为test.gz然后再用此法来进行gzip解压,但是,加密后的byte如何保存为test.gz呢???????

Answer 3

                    byte[] gzipbytes = DES.Decrypt(bytes, key, "");
                    System.IO.Compression.GZipStream gzip = new System.IO.Compression.GZipStream(new MemoryStream(gzipbytes), System.IO.Compression.CompressionMode.Decompress, true);
                    StreamReader reader = new StreamReader(gzip);
                    result = reader.ReadToEnd();
                    reader.Close();

byte[] gzipbytes = DES.Decrypt(bytes, key, "");

背景:因为服务端返回的数据是先压缩后加密的,所以我需要解密后解压,用此方法解不出来

Answer 4

                    byte[] gzipbytes = DES.Decrypt(bytes, key, "");
                    System.IO.Compression.GZipStream gzip = new System.IO.Compression.GZipStream(new MemoryStream(gzipbytes), System.IO.Compression.CompressionMode.Decompress, true);
                    StreamReader reader = new StreamReader(gzip);
                    result = reader.ReadToEnd();
                    reader.Close();

byte[] gzipbytes = DES.Decrypt(bytes, key, "");

背景:因为服务端返回的数据是先压缩后加密的,所以我需要解密后解压,用此方法解不出来

你好，

>>用这个组件转不出来,返回的内容是空的

对于解密后的byte[], 可以使用GZipStream.Read() 方法解压缩，详见以下示例代码：

byte[] gzipbytes = DES.Decrypt(bytes, key, "");

//Prepare for decompress
System.IO.MemoryStream ms = new System.IO.MemoryStream(gzipbytes);
System.IO.Compression.GZipStream sr = new System.IO.Compression.GZipStream(ms,
                System.IO.Compression.CompressionMode.Decompress);

//Reset variable to collect uncompressed result
gzipbytes = new byte[gzipbytes.Length];

//Decompress
int rByte = sr.Read(gzipbytes, 0, gzipbytes.Length);

//Transform byte[] unzip data to string
System.Text.StringBuilder sB = new System.Text.StringBuilder(rByte);
//Read the number of bytes GZipStream red and do not a for each bytes in
//resultByteArray;
for (int i = 0; i < rByte; i++)
{
                sB.Append((char)byteArray[i]);
}
sr.Close();
ms.Close();
sr.Dispose();
ms.Dispose();

txtData.Text = sB.ToString();

经过测试，可以正常解压显示出密文。

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Answer 5

谢谢了,结果是服务器端返回的那篇数据有问题,太悲剧!!!

我换了其它文章就是正确的了.郁闷死了.折腾了好久.没有想到换一篇文章试一下