Read_var(string pVarName)
{
if (!con.Connected)
{
return("error");
}
try
{
byte[] PKT_var_name;
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
PKT_var_name = enc.GetBytes(pVarName);
byte[] PKT_name_length = new byte[2];
PKT_name_length[0] = Convert.ToByte((pVarName.Length >> 8) & 255);
PKT_name_length[1] = Convert.ToByte(pVarName.Length & 255);
Byte PKT_mode_is_read = 0;
byte[] PKT_req_len = new byte[2];
PKT_req_len[0] = Convert.ToByte(((pVarName.Length + 3) >> 8) & 255);
PKT_req_len[1] = Convert.ToByte(pVarName.Length + 3 & 255);
byte[] PKT_req_id = new byte[2];
MSG_id += 1;
PKT_req_id[0] = Convert.ToByte((MSG_id >> 8) & 255);
PKT_req_id[1] = Convert.ToByte(MSG_id + 3 & 255);
short total_pkt_length = (short)(pVarName.Length + 7);
byte[] REQ_packet = new byte[total_pkt_length];
REQ_packet[0] = PKT_req_id[0];
REQ_packet[1] = PKT_req_id[1];
REQ_packet[2] = PKT_req_len[0];
REQ_packet[3] = PKT_req_len[1];
REQ_packet[4] = PKT_mode_is_read;
REQ_packet[5] = PKT_name_length[0];
REQ_packet[6] = PKT_name_length[1];
PKT_var_name.CopyTo(REQ_packet, 7);
var stm = con.GetStream();
stm.Write(REQ_packet, 0, REQ_packet.Length);
stm.Flush();
byte[] RSP_packet = new byte[con.ReceiveBufferSize];
// stm.Read(RSP_packet, 0, (int)(con.ReceiveBufferSize));
var result = stm.BeginRead(RSP_packet, 0, (int)(con.ReceiveBufferSize), null, null);
bool data_recive = false;
var success = result.AsyncWaitHandle.WaitOne(20);
data_recive = (bool)success;
/* Read Variable response packet structure example:
* ' 0 1 2 3 4 5 6
* ' xx xx | 00 0A | 00 | 00 06 | 35 35 33 39 39 33 | 00 01 01
* ' | 10 | 0 | 6 | 5 5 3 9 9 3 | 0 1 1
* 'SAME AS | RSP LEN | READ=00 | VALUE LEN | VALUE CHARS | TRAILER
* 'REQUEST | */
if (success)
{
short RSP_val_len = (short)(((RSP_packet[5] << 8) & 255) + RSP_packet[6]);
string RSP_val_payload;
RSP_val_payload = Encoding.ASCII.GetString(RSP_packet, 7, RSP_val_len);
int RSP_read_status = RSP_packet[7 + RSP_val_len + 2];
bool Ok = ((RSP_read_status > 0) && (RSP_val_len > 0) && (RSP_val_len > 0) && (RSP_packet[0] == PKT_req_id[0]) && (RSP_packet[1] == PKT_req_id[1]));
if (Ok)
{
return(RSP_val_payload);
}
else
{
return("Error");
}
}
else
{
return("error");
}
}
catch (Exception Ex)
{
return("error");
}
}
public bool Write_var(String pVarName, String pValue)
{
/*
* 'Write Variable request packet structure example:
* ' 0 1 2 3 4 5 6
* ' xx xx | 00 0F | 01 | 00 07 | 24 4F 56 5F 50 52 4F | 00 03 | 31 32 33
* ' | 15 | 1 | 7 | $ O V _ P R O | 3 | 1 2 3
* ' REQ ID | REQ LEN | WRITE=1 | VAR NAME LEN | VAR NAME CHARS | VAL LEN | VAL AS STRING
* '(RANDOM)|
*/
if (!con.Connected)
{
return(false);
}
try
{
byte[] PKT_value;
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
PKT_value = enc.GetBytes(pValue);
byte[] PKT_value_len = new byte[2];
PKT_value_len[0] = Convert.ToByte((pValue.Length >> 8) & 255);
PKT_value_len[1] = Convert.ToByte(pValue.Length & 255);
byte[] PKT_var_name;
PKT_var_name = enc.GetBytes(pVarName);
byte[] PKT_name_length = new byte[2];
PKT_name_length[0] = Convert.ToByte((pVarName.Length >> 8) & 255);
PKT_name_length[1] = Convert.ToByte(pVarName.Length & 255);
byte PKT_mode_is_write = 1;
byte[] PKT_req_id = new byte[2];
MSG_id++;
PKT_req_id[0] = Convert.ToByte((MSG_id >> 8) & 255);
PKT_req_id[1] = Convert.ToByte(MSG_id + 3 & 255);
byte[] PKT_req_len = new byte[2];
PKT_req_len[0] = Convert.ToByte(((2 + PKT_var_name.Length + 2 + PKT_value.Length + 3) >> 8) & 255);
PKT_req_len[1] = Convert.ToByte((2 + PKT_var_name.Length + 2 + PKT_value.Length + 3) & 255);
byte[] REQ_packet = new byte[5 + 2 + PKT_var_name.Length + 2 + PKT_value.Length - 1];
REQ_packet[0] = PKT_req_id[0];
REQ_packet[1] = PKT_req_id[1];
REQ_packet[2] = PKT_req_len[0];
REQ_packet[3] = PKT_req_len[1];
REQ_packet[4] = PKT_mode_is_write;
REQ_packet[5] = PKT_name_length[0];
REQ_packet[6] = PKT_name_length[1];
PKT_var_name.CopyTo(REQ_packet, 7);
PKT_value_len.CopyTo(REQ_packet, 7 + PKT_var_name.Length);
PKT_value.CopyTo(REQ_packet, 7 + PKT_var_name.Length + PKT_value_len.Length - 1);
var ServerStream = con.GetStream();
ServerStream.Write(REQ_packet, 0, REQ_packet.Length);
ServerStream.Flush();
/*
* 'Write Variable response packet structure example:
* ' 0 1 2 3 4 5 6
* ' xx xx | 00 0A | 01 | 00 06 | 35 35 33 39 39 33 | 00 | 01 01
* ' | 10 | 1 | 6 | 5 5 3 9 9 3 | 0 | 1 1
* 'SAME AS | RSP LEN | WRITE=1 | VALUE LEN | WRITTEN VALUE CHARS | PAD | READ status 01 01 = OK
* 'REQUEST |
*/
byte[] RSP_packet = new byte[con.ReceiveBufferSize];
var result = ServerStream.BeginRead(RSP_packet, 0, (int)(con.ReceiveBufferSize), null, null);
var success = result.AsyncWaitHandle.WaitOne(20);
if (success)
{
short RSP_val_len = (short)(((RSP_packet[5] << 8) & 255) + RSP_packet[6]);
string RSP_val_payload;
RSP_val_payload = Encoding.ASCII.GetString(RSP_packet, 7, RSP_val_len);
int RSP_read_status = RSP_packet[7 + RSP_val_len + 2];
return((RSP_read_status > 0) && (RSP_packet[0] == PKT_req_id[0]) && (RSP_packet[1] == PKT_req_id[1]));
}
else
{
return(false);
}
}
catch (Exception ex)
{
return(false);
}
}
