Moving from Winsock to Net.Sockets.Socket

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I have an ethernet device (PIC microcontroller) that is programmed to receive simple commands via ethernet. I have it working perfectly using the Winsock2005DLL.Winsock control. I'm trying without success to convert the code to use the System.Sockets.Socket class instead. Where am I missing ?

With the following 'Winsock' code, a connection is made and the device responds correctly to the hex commands:

C#

// make the connection
Winsock2005DLL.Winsock ws = new Winsock2005DLL.Winsock();
ws.RemotePort = 8888;
ws.RemoteServer = "10.0.0.10";
ws.Connect();

//prepare the data for sending
string s = "";
char cmd = (char)'\x00C0';
char[] bData = new char[] { (char)'\x00FE', (char)'\x00C0', (char)'\x00FF' };
foreach (char c in bData)
       s += c.ToString();

// send the data
ws.Send(s);

This 'Socket' code however, creates the connection successfully, but the device DOESN'T respond to the hex data that is sent.

C#

// make the connection
System.Net.EndPoint ep = new IPEndPoint(IPAddress.Parse("10.0.0.10"), 8888);
System.Net.Sockets.Socket sckt = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
sckt.Connect(ep);

// prepare the data for sending
string s = "";
char cmd = (char)'\x00C0';
char[] bData = new char[] { (char)'\x00FE', (char)'\x00C0', (char)'\x00FF' };
foreach (char c in bData)
       s += c.ToString();
byte[] bitData = System.Text.Encoding.ASCII.GetBytes(bData);

// send the data
sckt.Send(bitData);

Any help would be greatly appreciated.

Posted 17-Sep-12 20:57pm

TheRedEye

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andrevdcolff · Accepted Answer · 2012-09-17T23:26:00

If I'm not completely wrong here I think the problem is encoding.
Winsock uses ANSI as a default which in turn I believe on Windows is 1252 and you are converting your string to ASCII which is a different encoding.

Try changing your code to rather use the following:

C#

Encoding ansiEncoding = Encoding.GetEncoding(1252);

string s = "";
char cmd = (char)'\x00C0';
char[] bData = new char[] { (char)'\x00FE', (char)'\x00C0', (char)'\x00FF' };
foreach (char c in bData)
       s += c.ToString();

byte[] bitData = ansiEncoding.GetBytes(bData);

Hope this works for you, but let me know