public void ReleaseAllPrinters()
{
ReleaseClaimedPrinter();
if (Printer != null)
{
Printer.Dispose();
Printer = null;
StateChanged?.Invoke();
}
}
/// <summary>
/// Releases claim of printer instance 1
/// </summary>
void Release1_Click(object sender, RoutedEventArgs e)
{
if (claimedPrinter1 != null)
{
claimedPrinter1.ReleaseDeviceRequested -= ClaimedPrinter1_ReleaseDeviceRequested;
claimedPrinter1.Dispose();
claimedPrinter1 = null;
if (printerInstance1 != null)
{
printerInstance1.Dispose();
printerInstance1 = null;
}
rootPage.NotifyUser("Released claimed Instance 1", NotifyType.StatusMessage);
}
else
{
rootPage.NotifyUser("Instance 1 not claimed to release", NotifyType.StatusMessage);
}
}
// By default, use all connections types.
public static async Task <PosPrinter> GetFirstReceiptPrinterAsync(PosConnectionTypes connectionTypes = PosConnectionTypes.All)
{
return(await DeviceHelpers.GetFirstDeviceAsync(PosPrinter.GetDeviceSelector(connectionTypes),
async (id) =>
{
PosPrinter printer = await PosPrinter.FromIdAsync(id);
if (printer != null && printer.Capabilities.Receipt.IsPrinterPresent)
{
return printer;
}
// Dispose the unwanted printer.
printer?.Dispose();
return null;
}));
}
private void ResetTheScenarioState()
{
//Remove releasedevicerequested handler and dispose claimed printer object.
if (claimedPrinter != null)
{
claimedPrinter.ReleaseDeviceRequested -= ClaimedPrinter_ReleaseDeviceRequested;
claimedPrinter.Dispose();
claimedPrinter = null;
}
if (printer != null)
{
printer.Dispose();
printer = null;
}
}
async void FindPrinter_Click()
{
isBusy = true;
UpdateButtons();
rootPage.NotifyUser("", NotifyType.StatusMessage);
rootPage.ReleaseAllPrinters();
// Select a PosPrinter device using the Device Picker.
DevicePicker devicePicker = new DevicePicker();
devicePicker.Filter.SupportedDeviceSelectors.Add(PosPrinter.GetDeviceSelector());
// Anchor the picker on the Find button.
GeneralTransform ge = FindButton.TransformToVisual(Window.Current.Content as UIElement);
Rect rect = ge.TransformBounds(new Rect(0, 0, FindButton.ActualWidth, FindButton.ActualHeight));
DeviceInformation deviceInfo = await devicePicker.PickSingleDeviceAsync(rect);
rootPage.deviceInfo = deviceInfo;
PosPrinter printer = null;
if (deviceInfo != null)
{
printer = await PosPrinter.FromIdAsync(deviceInfo.Id);
}
if (printer != null && printer.Capabilities.Receipt.IsPrinterPresent)
{
rootPage.Printer = printer;
rootPage.NotifyUser("Found receipt printer.", NotifyType.StatusMessage);
}
else
{
// Get rid of the printer we can't use.
printer?.Dispose();
rootPage.NotifyUser("Please select a device whose printer is present.", NotifyType.ErrorMessage);
}
isBusy = false;
UpdateButtons();
}