我是C#的新手,我写了一个简单的Web服务。它接受zip文件并在文件系统中解压缩。在C#中代码是:
[WebMethod]
public String SetZip(string device_id, string file)
{
if (device_id == null || device_id.Length == 0)
{
return "10;no auth data";
}
StringBuilder output = new StringBuilder();
if (direcory == null)
{
return output.ToString();
}
string dirname = "c:\\temp\\" + direcory + "\\";
if (!System.IO.Directory.Exists(dirname))
{
System.IO.Directory.CreateDirectory(dirname);
}
string filename = dirname + "file1.txt";
string text = UnZipStr(Convert.FromBase64String(file));
File.WriteAllText(filename, text);
output.AppendLine("0;done");
return output.ToString();
}
public static string UnZipStr(byte[] input)
{
using (MemoryStream memstream = new MemoryStream())
{
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();
}
}
}
}
}
从java代码发送zip数据:
void callService(byte[] xmlData) {
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
request.addProperty("device_id", AGENT);
Deflater deflater = new Deflater();
deflater.setInput(xmlData);
deflater.finish();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
while (!deflater.finished()) {
int byteCount = deflater.deflate(buf);
baos.write(buf, 0, byteCount);
}
deflater.end();
byte[] compressedBytes = baos.toByteArray();
request.addPropertyIfValue("file", org.kobjects.base64.Base64.encode(compressedBytes));...}
在C#代码中,当从StreamReader
读取数据时,我有异常SoapFault - faultcode: 'soap:Server' faultstring: 'System.Web.Services.Protocols.SoapException: ---> InvalidDataException: Block length does not correspond to the complement.
System.IO.Compression.Inflater.DecodeUncompressedBlock(Boolean& end_of_block)
System.IO.Compression.Inflater.Decode()
System.IO.Compression.Inflater.Inflate(Byte[] bytes, Int32 offset, Int32 length)
System.IO.Compression.DeflateStream.Read(Byte[] array, Int32 offset, Int32 count)
System.IO.StreamReader.ReadBuffer()
System.IO.StreamReader.ReadToEnd()
Service.UnZipStr(Byte[] input) в c:\inetpub\wwwroot\WebSite\App_Code\Service.cs: at 94
Service.SetZip(String device_id, String file) в c:\inetpub\wwwroot\WebSite\App_Code \Service.cs: at 73
我做错了什么?
答案 0 :(得分:0)
编辑:我一直在挖掘,有一种方法可以从Java生成DEFLATE格式数据,C#识别出来:你必须使用Deflater(int,boolean)
构造函数。因此,将Java代码更改为:
Deflater deflater = new Deflater(Deflater.DEFAULT_COMPRESSION, true);
deflater.setInput(xmlData);
deflater.finish();
原因是默认情况下,deflater会发出一个ZLIB标头和校验和,这是C#DeflateStream
不期望的。
似乎Java和C#不同意“deflate”压缩算法的确切多样性,但通过我的测试“gzip”应该可以工作:
这压缩了Java中的xmlData
:
ByteArrayOutputStream baos = new ByteArrayOutputStream()
OutputStream out = new GZIPOutputStream(baos);
out.write(xmlData);
out.close();
byte[] compressedBytes = baos.toByteArray();
在C#中解压缩input
:
using (MemoryStream inputStream = new MemoryStream(input))
{
using (GZipStream gzip = new GZipStream(inputStream, CompressionMode.Decompress))
{
using (StreamReader reader = new StreamReader(gzip, System.Text.Encoding.UTF8))
{
return reader.ReadToEnd();
}
}
}
答案 1 :(得分:0)
看起来@Joni Salonen已经解决了deflate问题,所以我想补充一点关于架构的问题。要隔离问题,您应该将这两个问题分开。首先,您需要删除压缩文件。然后你需要放气。然后,分别关注问题区域。你总是可以"管道"这两个问题后来。
顺便说一下,在许多实例中使用原始zip文件很有用。当某些东西不能按计划运行时,它就会变成一个安全网,尤其是如果你只有一次机会捕获文件。