如何在 C# 中解压缩 Gzipped Http Get Response

Question

想要解压缩从 API 获取的 GZipped 响应。尝试了下面的代码，它总是返回类似：-

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\\u001f\xef\xbf\xbd\\b\\0\\0\\0\\0\\0\\0\\0\xef\xbf\xbdY]o........\n

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我的代码是：

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 private string GetResponse(string sData, string sUrl)\n {\n      try\n      {\n           string script = null;\n           try\n           {\n                string urlStr = @"" + sUrl + "?param=" + sData;\n\n                Uri url = new Uri(urlStr, UriKind.Absolute);\n\n                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);\n                request.Method = "GET";\n                request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;\n\n                using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())\n                using (StreamReader reader = new StreamReader(response.GetResponseStream()))\n                {\n                     script = reader.ReadToEnd();\n                }      \n           }\n           catch (System.Net.Sockets.SocketException)\n           {\n                // The remote site is currently down. Try again next time. \n           }\n           catch (UriFormatException)\n           {\n                // Only valid absolute URLs are accepted \n           }\n\n           return script;\n      }\n      catch (Exception ex)\n      {\n           throw new Exception(ex.ToString());\n      }\n }\n

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我从许多自动解压的参考文献中找到了上述代码。但最终，它对我不起作用。为了解压缩压缩的数据，我尝试了以下功能，

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 private string DecompressGZIP(string compressedText)\n {\n      byte[] gZipBuffer = Convert.FromBase64String(compressedText);\n      using (var memoryStream = new MemoryStream())\n      {\n           int dataLength = BitConverter.ToInt32(gZipBuffer, 0);\n           memoryStream.Write(gZipBuffer, 4, gZipBuffer.Length - 4);\n\n           var buffer = new byte[dataLength];\n\n           memoryStream.Position = 0;\n           using (var gZipStream = new GZipStream(memoryStream, CompressionMode.Decompress))\n           {\n                gZipStream.Read(buffer, 0, buffer.Length);\n           }\n\n           return Encoding.UTF8.GetString(buffer);\n      }\n }\n

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但是，由于以下异常，它在第一行代码本身也失败了：

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System.FormatException: \'输入不是有效的 Base-64 字符串，因为它包含非 Base-64 字符、两个以上的填充字符或填充字符中的非法字符。\'

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由于我是初学者，希望你们能指导我......提前致谢......

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Answer 1

这是负责解码 gzip 流的重要部分：

var clientHandler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate }; 
var client = new HttpClient(clientHandler); 

Answer 2

只需按如下方式更改我的功能，这对我来说非常有效：

private JObject PostingToPKFAndDecompress(string sData, string sUrl)
        {
            var jOBj = new JObject();
            try
            {

                try
                {
                    string urlStr = @"" + sUrl + "?param=" + sData;


                    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlStr);
                    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                    Stream resStream = response.GetResponseStream();

                    var t = ReadFully(resStream);
                    var y = Decompress(t);

                    using (var ms = new MemoryStream(y))
                    using (var streamReader = new StreamReader(ms))
                    using (var jsonReader = new JsonTextReader(streamReader))
                    {
                        jOBj = (JObject)JToken.ReadFrom(jsonReader);
                    }


                }
                catch (System.Net.Sockets.SocketException)
                {
                    // The remote site is currently down. Try again next time. 
                }

            }
            catch (Exception ex)
            {
                throw new Exception(ex.ToString());
            }
            return jOBj;
        }

        public static byte[] ReadFully(Stream input)
        {
            byte[] buffer = new byte[16 * 1024];
            using (MemoryStream ms = new MemoryStream())
            {
                int read;
                while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
                {
                    ms.Write(buffer, 0, read);
                }
                return ms.ToArray();
            }
        }

        public static byte[] Decompress(byte[] data)
        {
            using (var compressedStream = new MemoryStream(data))
            using (var zipStream = new GZipStream(compressedStream, CompressionMode.Decompress))
            using (var resultStream = new MemoryStream())
            {
                zipStream.CopyTo(resultStream);
                return resultStream.ToArray();
            }
        }