///////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Syncronous Send. Sends a Esys protocol message over the serial port and waits for
/// the response. Returns the reponse if successful, null otherwise.
/// </summary>
///////////////////////////////////////////////////////////////////////////////////////////
private Message Send(Message message, int timeout)
{
if (Connected) {
lock (mSyncLock) {
Esys.Protocol.Message result = null;
int count = timeout / 20;
mResult = null;
mMsgNumber = (mMsgNumber >= 99999) ? 1 : mMsgNumber + 1;
message.Number = mMsgNumber;
mPort.Write(message.ToString());
for (int i = 0; i < count; i++) {
result = mResult;
if (result != null && result.Number == message.Number && result is Message) {
break;
} else {
result = null;
Thread.Sleep(20);
}
}
return (Message)result;
}
} else {
return null;
}
}
///////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Event handler called when data is received on the serial port (mPort)
/// </summary>
///////////////////////////////////////////////////////////////////////////////////////////
private void mPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
Message result = new Message();
string endchar = ASCIIEncoding.ASCII.GetString(new byte[] { 0x03 });
try {
string data = mPort.ReadTo(endchar);
data = data.Remove(0, 1); //Remove the start char
if (result.TryParse(data)) {
mResult = result;
}
} catch {
//ArgumentException -The length of the value parameter is 0.
//ArgumentNullException -The value parameter is nullNothingnullptra null reference (Nothing in Visual Basic).
//InvalidOperationException -The specified port is not open.
//TimeoutException -The operation did not complete before the time-out period ended.
}
}
