public static dynamic CreateSerializerFromType(DeviceCommand device)
{
switch (device)
{
case DeviceCommand.PrintReceipt:
return(new EsponPrintReceiptSerializer());
default:
throw new System.NotSupportedException($"Device hub didnot support serilizer for command {device.ToString()}");
}
}
private void CommPortThreadProc()
{
App app = (App)Application.Current;
byte[] commandBytes = new byte[COMMAND_BUFFER_SIZE];
int errorCount = 0;
for (;;)
{
try
{
if (app.nextCommands.Count > 0)
{
DeviceCommand deviceCommand = app.nextCommands.Dequeue();
int length = deviceCommand.getBytes(commandBytes);
app.p.Write(commandBytes, 0, length);
//Console.WriteLine("Command: " + deviceCommand.ToString());
int attempts = 0;
int offset = 0;
length = deviceCommand.answerBytes;
for (;;)
{
int count = app.p.Read(commandBytes, offset, length);
length -= count;
offset += count;
if (length == 0)
{
break;
}
attempts++;
if (attempts == 10)
{
MessageBox.Show("Command = " + deviceCommand.ToString() + ", answer length: expected = " + deviceCommand.answerBytes +
"received = " + offset + (offset == 0 ? "" : ", answer: " + BitConverter.ToString(commandBytes, 0, offset)),
"Wrong device answer length", MessageBoxButton.OK, MessageBoxImage.Error);
break;
}
}
if (length == 0)
{
//Console.WriteLine("Answer: " + BitConverter.ToString(commandBytes, 0, count)));
if (!deviceCommand.CheckAnswer(commandBytes))
{
MessageBox.Show("Command = " + deviceCommand.ToString() + ", answer = " + BitConverter.ToString(commandBytes, 0, offset),
"Wrong device answer", MessageBoxButton.OK, MessageBoxImage.Error);
}
}
}
else
{
Thread.Sleep(1);
}
errorCount = 0;
}
catch (ThreadAbortException)
{
break;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Comm port error", MessageBoxButton.OK, MessageBoxImage.Error);
errorCount++;
}
if (errorCount > 3)
{
MessageBox.Show("Maximum error count reached. Giving up.", "Comm port error", MessageBoxButton.OK, MessageBoxImage.Error);
break;
}
}
}
public static dynamic CreateDeviceFromType(DeviceCommand device)
{
switch (device)
{
case DeviceCommand.PrintReceipt:
return(new EpsonPrinterDevice());
default:
throw new System.NotSupportedException($"Device hub didnot support device for command {device.ToString()}");
}
}