private async Task <string> RetrieveFormatContentAsync(FormatViewModel format) { string formatContent = null; Connection connection = null; try { await Task.Factory.StartNew(() => { connection = ConnectionCreator.Create(ViewModel.SelectedPrinter); connection.Open(); ZebraPrinter printer = ZebraPrinterFactory.GetInstance(connection); ZebraPrinterLinkOs linkOsPrinter = ZebraPrinterFactory.CreateLinkOsPrinter(printer); formatContent = Encoding.UTF8.GetString(printer.RetrieveFormatFromPrinter(format.PrinterPath)); }); } catch (Exception e) { await AlertCreator.ShowErrorAsync(this, e.Message); } finally { await Task.Factory.StartNew(() => { try { connection?.Close(); } catch (ConnectionException) { } }); } return(formatContent); }
private async void SelectButton_Clicked(object sender, EventArgs eventArgs) { if (!viewModel.IsSelectingPrinter && Navigation.NavigationStack.Count > 0 && Navigation.NavigationStack.Last().GetType() == typeof(SelectPrinterPage)) { await Task.Factory.StartNew(() => { viewModel.IsSelectingPrinter = true; }); try { DiscoveredPrinter selectedPrinter = (DiscoveredPrinter)PrinterList.SelectedItem; Connection connection = null; try { await Task.Factory.StartNew(() => { connection = ConnectionCreator.Create(selectedPrinter); connection.Open(); }); } catch (Exception e) { await AlertCreator.ShowErrorAsync(this, e.Message); return; } finally { await Task.Factory.StartNew(() => { try { connection?.Close(); } catch (ConnectionException) { } }); } await Task.Factory.StartNew(() => { mainPage.ViewModel.SelectedPrinter = selectedPrinter; }); mainPage.RefreshFormatLists(); await Navigation.PopAsync(); } finally { await Task.Factory.StartNew(() => { viewModel.IsSelectingPrinter = false; }); } } }
private async Task AddPrinterFormatsToFormatListAsync() { Connection connection = null; try { List <FormatViewModel> formats = new List <FormatViewModel>(); await Task.Factory.StartNew(() => { connection = ConnectionCreator.Create(ViewModel.SelectedPrinter); connection.Open(); ZebraPrinter printer = ZebraPrinterFactory.GetInstance(connection); ZebraPrinterLinkOs linkOsPrinter = ZebraPrinterFactory.CreateLinkOsPrinter(printer); string[] formatPrinterPaths = printer.RetrieveFileNames(new string[] { "ZPL" }); foreach (string formatPrinterPath in formatPrinterPaths) { int colonIndex = formatPrinterPath.IndexOf(":"); string driveLetter = formatPrinterPath.Substring(0, colonIndex); string name = formatPrinterPath.Substring(colonIndex + 1, formatPrinterPath.LastIndexOf(".") - colonIndex - 1); string extension = formatPrinterPath.Substring(formatPrinterPath.LastIndexOf(".") + 1); if (!string.Equals(driveLetter, "Z", StringComparison.OrdinalIgnoreCase)) // Ignore all formats stored on printer's Z drive { formats.Add(new FormatViewModel { DriveLetter = driveLetter, Name = name, Extension = extension, Content = null, // Populate this later, upon navigating to print format page Source = FormatSource.Printer, OnSaveButtonClicked = new Command(async(object parameter) => { if (!ViewModel.IsSavingFormat && !ViewModel.IsDeletingFormat && !ViewModel.IsStoredFormatListRefreshing) { FormatViewModel format = parameter as FormatViewModel; await Task.Factory.StartNew(() => { ViewModel.IsSavingFormat = true; format.IsSaving = true; }); await SavePrinterFormatAsync(format); await Task.Factory.StartNew(() => { format.IsSaving = false; ViewModel.IsSavingFormat = false; }); await RefreshStoredFormatListAsync(); } }), OnPrintButtonClicked = new Command(async(object parameter) => { if (!ViewModel.IsSavingFormat) { FormatViewModel format = parameter as FormatViewModel; await PushPageAsync(new PrintFormatPage(ViewModel.SelectedPrinter, format)); } }) }); } } formats.ForEach(ViewModel.PrinterFormatList.Add); }); } catch (Exception e) { await AlertCreator.ShowErrorAsync(this, e.Message); } finally { await Task.Factory.StartNew(() => { try { connection?.Close(); } catch (ConnectionException) { } }); } }
private async Task SavePrinterFormatAsync(FormatViewModel format) { PrintStationDatabase.StoredFormat storedFormat = null; Connection connection = null; bool fileWriteAttempted = false; bool linePrintEnabled = false; try { await Task.Factory.StartNew(async() => { connection = ConnectionCreator.Create(ViewModel.SelectedPrinter); connection.Open(); string originalPrinterLanguage = SGD.GET(PrintFormatPage.DeviceLanguagesSgd, connection); linePrintEnabled = "line_print".Equals(originalPrinterLanguage, StringComparison.OrdinalIgnoreCase); if (linePrintEnabled) { SGD.SET(PrintFormatPage.DeviceLanguagesSgd, "zpl", connection); } ZebraPrinter printer = ZebraPrinterFactory.GetInstance(connection); ZebraPrinterLinkOs linkOsPrinter = ZebraPrinterFactory.CreateLinkOsPrinter(printer); string formatContent = Encoding.UTF8.GetString(printer.RetrieveFormatFromPrinter(format.PrinterPath)); fileWriteAttempted = true; storedFormat = new PrintStationDatabase.StoredFormat { DriveLetter = format.DriveLetter, Name = format.Name, Extension = format.Extension, Content = formatContent }; await App.Database.SaveStoredFormatAsync(storedFormat); }); } catch (Exception e) { await Task.Factory.StartNew(async() => { if (fileWriteAttempted && storedFormat != null) { await App.Database.DeleteStoredFormatByIdAsync(storedFormat.Id); } }); await AlertCreator.ShowErrorAsync(this, e.Message); } finally { if (linePrintEnabled) { await Task.Factory.StartNew(() => { try { connection?.Open(); SGD.SET(PrintFormatPage.DeviceLanguagesSgd, "line_print", connection); } catch (ConnectionException) { } }); } await Task.Factory.StartNew(() => { try { connection?.Close(); } catch (ConnectionException) { } }); } }
public MainPage() { InitializeComponent(); BindingContext = ViewModel; if (Device.RuntimePlatform != Device.WPF || !DependencyService.Get <IPlatformHelper>().IsWindows10()) { ToolbarItems.Remove(BluetoothHelpButton); // Bluetooth help dialog is specific to Windows 10 } try { if (DependencyService.Get <INfcManager>().IsNfcAvailable()) { DependencyService.Get <INfcManager>().TagScanned += async(object sender, string nfcData) => { Device.BeginInvokeOnMainThread(async() => { await Navigation.PopToRootAsync(); // Must call Navigation.PopToRootAsync() on UI thread on Windows tablets }); await Task.Factory.StartNew(() => { ViewModel.IsSelectingNfcPrinter = true; ViewModel.SelectedPrinter = null; try { ViewModel.StoredFormatList.Clear(); } catch (NotImplementedException) { ViewModel.StoredFormatList.Clear(); // Workaround for Xamarin.Forms.Platform.WPF issue: https://github.com/xamarin/Xamarin.Forms/issues/3648 } try { ViewModel.PrinterFormatList.Clear(); } catch (NotImplementedException) { ViewModel.PrinterFormatList.Clear(); // Workaround for Xamarin.Forms.Platform.WPF issue: https://github.com/xamarin/Xamarin.Forms/issues/3648 } }); Connection connection = null; DiscoveredPrinter printer = null; bool success = false; try { await Task.Factory.StartNew(() => { printer = NfcDiscoverer.DiscoverPrinter(nfcData); connection = printer.GetConnection(); try { connection.Open(); // Test connection } catch (Exception e) { throw new ConnectionException("Could not open connection. Please check your printer and device settings and try again.", e); } success = true; }); } catch (Exception e) { await AlertCreator.ShowErrorAsync(this, e.Message); } finally { await Task.Factory.StartNew(() => { try { connection?.Close(); } catch (Exception) { } if (success) { ViewModel.SelectedPrinter = printer; ViewModel.IsSelectingNfcPrinter = false; RefreshFormatLists(); } else { ViewModel.IsSelectingNfcPrinter = false; } }); } }; } } catch (TypeLoadException) { } // NFC is not supported on Windows 7 InitializeStoredFormats(); }
private async Task PopulateVariableFieldListAsync() { await Task.Factory.StartNew(() => { viewModel.IsVariableFieldListRefreshing = true; try { viewModel.FormatVariableList.Clear(); } catch (NotImplementedException) { viewModel.FormatVariableList.Clear(); // Workaround for Xamarin.Forms.Platform.WPF issue: https://github.com/xamarin/Xamarin.Forms/issues/3648 } }); 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); if (format.Source == FormatSource.Printer) { format.Content = Encoding.UTF8.GetString(printer.RetrieveFormatFromPrinter(format.PrinterPath)); } FieldDescriptionData[] variableFields = printer.GetVariableFields(format.Content); foreach (FieldDescriptionData variableField in variableFields) { viewModel.FormatVariableList.Add(new FormatVariable { Name = variableField.FieldName ?? $"Field {variableField.FieldNumber}", Index = variableField.FieldNumber, }); } }); } catch (Exception e) { await AlertCreator.ShowErrorAsync(this, e.Message); } finally { if (linePrintEnabled) { await ResetPrinterLanguageToLinePrintAsync(connection); } await Task.Factory.StartNew(() => { try { connection?.Close(); } catch (ConnectionException) { } viewModel.IsVariableFieldListRefreshing = false; }); } }
private async void PrintButton_Clicked(object sender, EventArgs eventArgs) { await Task.Factory.StartNew(() => { viewModel.IsSendingPrintJob = true; }); Connection connection = null; bool linePrintEnabled = false; try { await Task.Factory.StartNew(() => { connection = ConnectionCreator.Create(selectedPrinter); connection.Open(); string originalPrinterLanguage = SGD.GET(DeviceLanguagesSgd, connection); linePrintEnabled = "line_print".Equals(originalPrinterLanguage, StringComparison.OrdinalIgnoreCase); if (linePrintEnabled) { SGD.SET(DeviceLanguagesSgd, "zpl", connection); } ZebraPrinter printer = ZebraPrinterFactory.GetInstance(connection); ZebraPrinterLinkOs linkOsPrinter = ZebraPrinterFactory.CreateLinkOsPrinter(printer); string errorMessage = GetPrinterStatusErrorMessage(printer.GetCurrentStatus()); if (errorMessage != null) { throw new PrinterNotReadyException($"{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) { } }); } }