I'm sending to a device a request as byte array and I want to receive the anwser device gives.
...
Socket deviceSocket = new Socket(server);
List<byte> coming = new List<byte>();
...
deviceSocket.Receive(coming)
Here the program gives error:
Error 1
The best overloaded method match for 'System.Net.Sockets.Socket.Receive(byte[])' has some invalid arguments
Error 2
Argument '1': cannot convert from 'System.Collections.Generic.List' to 'byte[]'
How can I solve it ?
Thanks.
The Socket.Receive() method will fill a buffer with as much data as it can fit, or as much data is available, whichever is lower.
If you know all your messages are under 2048 bytes then you could declare your buffer as follows:
byte[] buffer = new byte[2048];
int bytesReceived = 0;
// ... somewhere later, getting data from client ...
bytesReceived = deviceSocket.Receive( buffer );
Debug.WriteLine( String.Format( "{0} bytes received", bytesReceived ) );
// now process the 'bytesReceived' bytes in the buffer
for( int i = 0; i < bytesReceived; i++ )
{
Debug.WriteLine( buffer[i] );
}
Of course you probably want to do something more than write the bytes to the debug output, but you get the idea :)
You still need to be aware that you may get incomplete data, if the client broke the message into multiple packets then one might come through (and be received) and then later another. It's always good to have some way of telling the server how much data to expect, then it can assemble the complete message before processing it.
I would solve it like this:
int bytesRead = 0;
byte[] incomming = new byte[1024];
byte[] trimmed;
try
{
bytesRead = sTcp.Read(incomming , 0, 1024);
trimmed = new byte[bytesRead];
Array.Copy(incomming , trimmed , bytesRead);
}
catch
{
return;
}
but a small reminder is that you actually creates 2 arrays, thus using more memory!
If you require coming to act as a list prior to calling Receive you can also use:
deviceSocket.Receive(coming.ToArray());
byte[] coming = new byte[8];
deviceSocket.Receive(coming);
for (int i = 0; i < 8; i++)
{
xtxtComing.Text += coming[i].ToString() + " ";
}
the code above works in my listening loop [xtxtComing is a textbox !
List coming does not give any error by complying.
List<byte> coming1 = new List<byte>();
deviceSocket.Receive(coming1.ToArray());
for (int i = 0; i < coming1.ToArray().Length; i++)
{
xtxtComing.Text += "a " + coming1[i].ToString() + " ";
}
These code above in the same loop does not work, I can not get anything in xtxtComing textbox. Maybe I have a syntax error or as I believe Receive function do not work with List<> compatible.
Sorry for late answer, I have tried to get them :)
Try this:
foreach (item in coming)
{
xtxtComing.Text += $"a {item} ";
}
