public async Task PrintAsync(DiscoveredPrinter printer, string message)
{
Connection connection = null;
bool linePrintEnabled = false;
try
{
await Task.Factory.StartNew(() =>
{
connection = ConnectionCreator.Create(printer);
connection.Open();
string originalPrinterLanguage = SGD.GET(DeviceLanguagesSgd, connection);
linePrintEnabled = "line_print".Equals(originalPrinterLanguage, StringComparison.OrdinalIgnoreCase);
if (linePrintEnabled)
{
SGD.SET(DeviceLanguagesSgd, "zpl", connection);
}
ZebraPrinter zebraPrinter = ZebraPrinterFactory.GetInstance(connection);
ZebraPrinterLinkOs linkOsPrinter = ZebraPrinterFactory.CreateLinkOsPrinter(zebraPrinter);
string errorMessage = GetPrinterStatusErrorMessage(zebraPrinter.GetCurrentStatus());
if (errorMessage != null)
{
throw new PrinterNotReadyException($"{errorMessage}. Please check your printer and try again.");
}
else
{
connection.Write(Encoding.UTF8.GetBytes(message));
}
});
if (linePrintEnabled)
{
await ResetPrinterLanguageToLinePrintAsync(connection);
}
}
catch (PrinterNotReadyException e)
{
if (linePrintEnabled)
{
await ResetPrinterLanguageToLinePrintAsync(connection);
}
throw new Exception(e.Message);
}
catch (Exception e)
{
if (linePrintEnabled)
{
await ResetPrinterLanguageToLinePrintAsync(connection);
}
throw new Exception(e.Message);
}
finally
{
await Task.Factory.StartNew(() =>
{
try
{
connection?.Close();
}
catch (ConnectionException) { }
});
}
}
