Hello!
I have a problem with my C# Client/Server network program. This problem only occurs when connecting via an IP over the internet, whereas everything works fine using a local address (127.0.0.1).
What happens is while transferring a file (10kb or more maybe) using the below code, my receiving program (Client if downloading from server) freezes, on closer inspection I have narrowed it down to the below methods. One of the symptoms of this is that the hash code of byte being sent is mismatched.
Here is the base code:
Writing method:
public void WriteFrame112_GUI(FileStream f)
{
try
{
SC.WriteByte(112);
SC.WriteInteger((int)f.Length);
for (int i = 0; i < f.Length; i++)
{
if (i % 10 == 0)
Application.DoEvents();
SC.WriteByte((byte)f.ReadByte());
}
}
catch (Exception e) { MessageBox.Show(e.Message); }
}
Reading method:
Please note: The first byte (In this case, 112) has already been read before the reading method is called.
public byte[] ReadFrame112_GUI()
{
try
{
int filelen = SC.ReadInteger();
byte[] data = new byte[filelen];
for (int i = 0; i < filelen; i++)
{
if (i % 10 == 0)
Application.DoEvents();
data[i] = SC.ReadByte();
}
return data;
}
catch (Exception e) { MessageBox.Show(e.Message); return null; }
}
These both in turn call:
public void WriteHash(object Obj)
{
int hInt = Obj.GetHashCode();
byte[] Buffer = new byte[4];
int Offset = 0;
Buffer[Offset++] = (byte)(hInt >> 24);
Buffer[Offset++] = (byte)(hInt >> 16);
Buffer[Offset++] = (byte)(hInt >> 8);
Buffer[Offset++] = (byte)(hInt);
NS.Write(Buffer, 0, 4);
}
public int ReadHash()
{
while (!NS.DataAvailable) ; // Wait for data
byte[] Buffer = new byte[4];
int Offset = 0;
NS.Read(Buffer, Offset, Buffer.Length);
int Val = (int)(Buffer[0] << 24) + (Buffer[1] << 16) + (Buffer[2] << 8) + (Buffer[3]);
return Val;
}
public void WriteByte(byte b)
{
WriteHash(b);
NS.WriteByte(b);
}
public byte ReadByte()
{
int Hash = ReadHash();
while (!NS.DataAvailable) ; // Wait for data
byte Val = (byte)NS.ReadByte();
if (Hash != Val.GetHashCode())
{
throw new Exception("Hash Code Mismatch Exception (byte): " + Hash + ":" + Val.GetHashCode());
}
return Val;
}
