Im trying to read/write xml from/to a server using a tcp socket connection. It gives me the error Root element is missing. I know there are xmpp/jabber libraries out there but I am looking for an easy custom solution how to do this in general and how to fix the error in my code. I would greatly appreciate if someone could help me out :)
private void WritePreauthStreamInit(XmlWriter writer, string domain)
{
this.socketStream = new NetworkStream(this._socket);
XmlWriter writer1 = XmlWriter.Create(this.socketStream);
writer1.WriteStartElement("stream", "stream", "http://etherx.jabber.org/streams");
writer1.WriteAttributeString("to", domain);
writer1.WriteAttributeString("version", "1.0");
writer1.WriteStartElement("start-ack");
writer1.WriteEndElement();
writer1.Flush();
XmlReader reader1 = XmlReader.Create(this.socketStream);
while (reader1.Read()) //Exception: Root element is missing
{
string xml = reader1.Read().ToString();
}
}
My guess is that either XmlReader has false assumptions regarding buffer size of received data (IE: it expects to read either 4096 bytes or hit the end of the stream before it starts processing data) or the server is not sending what would be a valid document.
Either way, you could check by implementing a logging stream wrapper which dumps network traffic to disk or by using Wireshark or similar.
public class LoggingStreamWrapper : Stream
{
private Stream baseStream;
private TextWriter twLog;
private Encoding baseEncoding;
public LoggingStreamWrapper(Stream baseStream, TextWriter twLog)
: this(baseStream, twLog, Encoding.UTF8)
{
}
public LoggingStreamWrapper(Stream baseStream, TextWriter twLog, Encoding encoding)
{
if (baseStream == null)
throw new ArgumentNullException("baseStream");
if (twLog == null)
throw new ArgumentNullException("twLog");
this.baseStream = baseStream;
this.twLog = twLog;
this.baseEncoding = encoding;
}
public override bool CanRead
{
get { return baseStream.CanRead; }
}
public override bool CanSeek
{
get { return baseStream.CanSeek; }
}
public override bool CanWrite
{
get { return baseStream.CanWrite; }
}
public override void Flush()
{
baseStream.Flush();
twLog.WriteLine("Flushed stream");
twLog.Flush();
}
public override long Length
{
get { return baseStream.Length; }
}
public override long Position
{
get { return baseStream.Position; }
set
{
baseStream.Position = value;
twLog.WriteLine(string.Format("Set position to {0}", value));
twLog.Flush();
}
}
public override int Read(byte[] buffer, int offset, int count)
{
var bRead = baseStream.Read(buffer, offset, count);
if (bRead > 1)
{
twLog.WriteLine(string.Format("Read {0} bytes from stream: {1}\r\n{2}", bRead,
getText(buffer, offset, bRead),
Convert.ToBase64String(buffer, offset, bRead, Base64FormattingOptions.InsertLineBreaks)));
twLog.Flush();
}
else
{
twLog.WriteLine(string.Format("Read {0} bytes from stream", bRead));
twLog.Flush();
}
return bRead;
}
private string getText(byte[] buffer, int offset, int bRead)
{
try
{
return baseEncoding.GetString(buffer, offset, bRead);
}
catch
{
return "{ERROR: Could not convert to text}";
}
}
public override long Seek(long offset, SeekOrigin origin)
{
var newpos = baseStream.Seek(offset, origin);
twLog.WriteLine(string.Format("Seeked to {0} relative to {1}. New offset {2}", offset, origin, newpos));
twLog.Flush();
return newpos;
}
public override void SetLength(long value)
{
baseStream.SetLength(value);
twLog.WriteLine(string.Format("Set length to {0}", value));
twLog.Flush();
}
public override void Write(byte[] buffer, int offset, int count)
{
baseStream.Write(buffer, offset, count);
twLog.WriteLine(string.Format("Wrote {0} bytes to stream: {1}\r\n{2}", count,
getText(buffer, offset, count),
Convert.ToBase64String(buffer, offset, count, Base64FormattingOptions.InsertLineBreaks)));
twLog.Flush();
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (disposing)
{
twLog.Dispose();
baseStream.Dispose();
}
}
}
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