private async void PrintButton_Clicked(object sender, EventArgs eventArgs)
{
await Task.Factory.StartNew(() => {
viewModel.IsSendingPrintJob = true;
});
Connection connection = null;
bool linePrintEnabled = false;
try {
await Task.Factory.StartNew(() => {
connection = ConnectionCreator.Create(selectedPrinter);
connection.Open();
string originalPrinterLanguage = SGD.GET(DeviceLanguagesSgd, connection);
linePrintEnabled = "line_print".Equals(originalPrinterLanguage, StringComparison.OrdinalIgnoreCase);
if (linePrintEnabled)
{
SGD.SET(DeviceLanguagesSgd, "zpl", connection);
}
ZebraPrinter printer = ZebraPrinterFactory.GetInstance(connection);
ZebraPrinterLinkOs linkOsPrinter = ZebraPrinterFactory.CreateLinkOsPrinter(printer);
string errorMessage = GetPrinterStatusErrorMessage(printer.GetCurrentStatus());
if (errorMessage != null)
{
throw new PrinterNotReadyException($"{errorMessage}. Please check your printer and try again.");
}
else
{
if (format.Source != FormatSource.Printer)
{
connection.Write(Encoding.UTF8.GetBytes(format.Content));
}
linkOsPrinter.PrintStoredFormatWithVarGraphics(format.PrinterPath, BuildFormatVariableDictionary(), "UTF-8");
}
});
if (linePrintEnabled)
{
await ResetPrinterLanguageToLinePrintAsync(connection);
}
await Task.Factory.StartNew(() => {
viewModel.IsSendingPrintJob = false;
});
} catch (PrinterNotReadyException e) {
if (linePrintEnabled)
{
await ResetPrinterLanguageToLinePrintAsync(connection);
}
await Task.Factory.StartNew(() => {
viewModel.IsSendingPrintJob = false;
});
await AlertCreator.ShowAsync(this, "Printer Error", e.Message);
} catch (Exception e) {
if (linePrintEnabled)
{
await ResetPrinterLanguageToLinePrintAsync(connection);
}
await Task.Factory.StartNew(() => {
viewModel.IsSendingPrintJob = false;
});
await AlertCreator.ShowErrorAsync(this, e.Message);
} finally {
await Task.Factory.StartNew(() => {
try {
connection?.Close();
} catch (ConnectionException) { }
});
}
}