private void doLocalBroadcast()
{
try {
DiscoveredPrinter[] printers = NetworkDiscoverer.LocalBroadcast();
displayPrinters(printers);
} catch (DiscoveryException ex) {
handleException(ex.Message);
}
}
private async Task DiscoverPrintersAsync()
{
await ClearDiscoveredPrinterListAsync();
await Task.Factory.StartNew(() => {
viewModel.IsPrinterListRefreshing = true;
});
Device.BeginInvokeOnMainThread(async() => {
await AnimateRefreshIconAsync();
});
await Task.Factory.StartNew(() => {
try {
List <DiscoveredPrinter> usbDriverPrinters = DependencyService.Get <IConnectionManager>().GetZebraUsbDriverPrinters();
foreach (DiscoveredPrinter printer in usbDriverPrinters)
{
Device.BeginInvokeOnMainThread(() => {
viewModel.DiscoveredPrinterList.Add(printer); // ListView view model operations must be done on UI thread due to iOS issues when clearing list while item is selected: https://forums.xamarin.com/discussion/19114/invalid-number-of-rows-in-section
});
}
} catch (Exception) {
// Do nothing
}
try {
DiscoveryHandlerImplementation usbDiscoveryHandler = new DiscoveryHandlerImplementation(this);
DependencyService.Get <IConnectionManager>().GetZebraUsbDirectPrinters(usbDiscoveryHandler);
while (!usbDiscoveryHandler.IsFinished)
{
Thread.Sleep(100);
}
} catch (Exception) {
// Do nothing
}
DiscoveryHandlerImplementation networkDiscoveryHandler = new DiscoveryHandlerImplementation(this);
NetworkDiscoverer.LocalBroadcast(networkDiscoveryHandler);
while (!networkDiscoveryHandler.IsFinished)
{
Thread.Sleep(100);
}
if (Device.RuntimePlatform != Device.WPF || DependencyService.Get <IPlatformHelper>().IsWindows10())
{
try {
DiscoveryHandlerImplementation bluetoothDiscoveryHandler = new DiscoveryHandlerImplementation(this);
DependencyService.Get <IConnectionManager>().FindBluetoothPrinters(bluetoothDiscoveryHandler);
while (!bluetoothDiscoveryHandler.IsFinished)
{
Thread.Sleep(100);
}
} catch (Exception) {
// Do nothing
}
}
});
await Task.Factory.StartNew(() => {
viewModel.IsPrinterListRefreshing = false;
});
ViewExtensions.CancelAnimations(RefreshIcon);
}
/// <exception cref="ConnectionException"></exception>
/// <exception cref="DiscoveryException"></exception>
private void PerformDiscovery()
{
DiscoveryHandlerImpl discoveryHandler = new DiscoveryHandlerImpl(this);
switch (discoveryMethodsDropdown.SelectedItem)
{
case DiscoveryMethod.DirectedBroadcast:
NetworkDiscoverer.DirectedBroadcast(discoveryHandler, viewModel.IpAddress);
break;
case DiscoveryMethod.FindPrintersNearMe:
NetworkDiscoverer.FindPrinters(discoveryHandler);
break;
case DiscoveryMethod.LocalBroadcast:
NetworkDiscoverer.LocalBroadcast(discoveryHandler);
break;
case DiscoveryMethod.MulticastBroadcast:
NetworkDiscoverer.Multicast(discoveryHandler, int.Parse(viewModel.NumberOfHops));
break;
case DiscoveryMethod.SubnetSearch:
NetworkDiscoverer.SubnetSearch(discoveryHandler, viewModel.SubnetRange);
break;
case DiscoveryMethod.ZebraUsbDrivers:
try {
discoveryHandler = null;
discoverPrintersButton.IsEnabled = false;
viewModel.DiscoveredPrinters.Clear();
foreach (DiscoveredPrinterDriver printer in UsbDiscoverer.GetZebraDriverPrinters())
{
viewModel.DiscoveredPrinters.Add(printer);
}
} finally {
SetDiscoverButtonState(true);
}
break;
case DiscoveryMethod.UsbDirect:
try {
discoveryHandler = null;
discoverPrintersButton.IsEnabled = false;
viewModel.DiscoveredPrinters.Clear();
foreach (DiscoveredUsbPrinter printer in UsbDiscoverer.GetZebraUsbPrinters())
{
viewModel.DiscoveredPrinters.Add(printer);
}
} finally {
SetDiscoverButtonState(true);
}
break;
case DiscoveryMethod.Bluetooth:
BluetoothDiscoverer.FindPrinters(discoveryHandler);
break;
}
}
private async void DiscoverPrintersButton_Clicked(object sender, EventArgs eventArgs)
{
SetInputEnabled(false);
try {
ClearDiscoveredPrinters();
DiscoveryHandlerImplementation discoveryHandler = new DiscoveryHandlerImplementation(this);
await Task.Factory.StartNew(() => {
switch (GetSelectedDiscoveryMethod())
{
case DiscoveryMethod.LocalBroadcast:
NetworkDiscoverer.LocalBroadcast(discoveryHandler);
break;
case DiscoveryMethod.DirectedBroadcast:
NetworkDiscoverer.DirectedBroadcast(discoveryHandler, IpAddressEntry.Text);
break;
case DiscoveryMethod.MulticastBroadcast:
if (string.IsNullOrWhiteSpace(NumberOfHopsEntry.Text))
{
throw new ArgumentException("Number of hops must not be empty");
}
try {
NetworkDiscoverer.Multicast(discoveryHandler, int.Parse(NumberOfHopsEntry.Text));
} catch (FormatException) {
Device.BeginInvokeOnMainThread(async() => {
await DisplayAlert("Format Error", "Number of hops must be an integer", "OK");
});
} finally {
SetInputEnabled(true);
}
break;
case DiscoveryMethod.SubnetSearch:
if (string.IsNullOrWhiteSpace(SubnetRangeEntry.Text))
{
throw new ArgumentException("Subnet range must not be empty");
}
NetworkDiscoverer.SubnetSearch(discoveryHandler, SubnetRangeEntry.Text);
break;
case DiscoveryMethod.ZebraUsbDrivers:
try {
foreach (DiscoveredPrinter printer in DependencyService.Get <IConnectionManager>().GetZebraUsbDriverPrinters())
{
Device.BeginInvokeOnMainThread(() => {
discoveredPrinters.Add(printer);
});
}
} catch (NotImplementedException) {
Device.BeginInvokeOnMainThread(async() => {
await DisplayAlert("Error", "USB driver discovery not supported on this platform", "OK");
});
} finally {
SetInputEnabled(true);
}
break;
case DiscoveryMethod.UsbDirect:
try {
DependencyService.Get <IConnectionManager>().GetZebraUsbDirectPrinters(discoveryHandler);
} catch (NotImplementedException) {
Device.BeginInvokeOnMainThread(async() => {
await DisplayAlert("Error", "USB direct discovery not supported on this platform", "OK");
});
} finally {
SetInputEnabled(true);
}
break;
case DiscoveryMethod.FindPrintersNearMe:
NetworkDiscoverer.FindPrinters(discoveryHandler);
break;
case DiscoveryMethod.FindAllBluetoothDevices:
try {
DependencyService.Get <IConnectionManager>().FindBluetoothPrinters(discoveryHandler);
} catch (NotImplementedException) {
Device.BeginInvokeOnMainThread(async() => {
await DisplayAlert("Error", "Bluetooth discovery not supported on this platform", "OK");
});
} finally {
SetInputEnabled(true);
}
break;
}
});
} catch (Exception e) {
await DisplayAlert("Error", e.Message, "OK");
SetInputEnabled(true);
}
}
private void searchWiFi()
{
Logger.Write("Start search TCP printers");
// process connection to TCP address
PrinterZebra.EPrinterConnectionType connType = PrinterZebra.EPrinterConnectionType.eTCP;
if (deviceAdress != null && devicePort > 0 && !PrinterManager.Instance.hasPrinter(deviceAdress))
{
Logger.Write("searching in address: " + deviceAdress);
ConnecttionJob job = zebraSingleton.tryToConnect(devicePort, deviceAdress, ZebraConstants.connectionTimeout, connType);
if (job.Connection != null)
{
Logger.Write("Found printer on address: " + deviceAdress);
PrinterManager.Instance.addPrinterWithID(deviceAdress, devicePort, connType);
if (!isSearchStopped)
{
zebraSingleton.sendConnectResult(job.FriendlyName, deviceAdress, devicePort, connType, oResult);
}
job.Close();
}
}
else
{
Logger.Write("Start search in TCP network");
DiscoveredPrinter[] printers = null;
for (int attempt = 0; attempt < connettionAttempts; attempt++)
{
printers = NetworkDiscoverer.LocalBroadcast();
if (printers.Length > 0)
{
break;
}
Thread.Sleep(500);
}
if (printers.Length == 0)
{
for (int attempt = 0; attempt < connettionAttempts; attempt++)
{
printers = NetworkDiscoverer.Multicast(5);
if (printers.Length > 0)
{
break;
}
Thread.Sleep(500);
}
}
LogDiscoveryPrinters(printers);
foreach (DiscoveredPrinter printer in printers)
{
if (isSearchStopped)
{
break;
}
Logger.Write("searching in address: " + printer.Address);
if ((printer is DiscoveredPrinterNetwork) && !PrinterManager.Instance.hasPrinter(printer.Address))
{
DiscoveredPrinterNetwork networkPrinter = (DiscoveredPrinterNetwork)printer;
ConnecttionJob job = zebraSingleton.tryToConnect(networkPrinter.Port, networkPrinter.Address, ZebraConstants.connectionTimeout, connType);
if (job.Connection != null)
{
Logger.Write("Found printer on address: " + printer.Address);
PrinterManager.Instance.addPrinterWithID(networkPrinter.Address, networkPrinter.Port, connType);
zebraSingleton.sendConnectResult(job.FriendlyName, networkPrinter.Address, networkPrinter.Port, connType, oResult);
job.Close();
}
}
}
}
}