private async Task <bool> FindReceiptPrinter()
{
if (printer == null)
{
rootPage.NotifyUser("Finding printer", NotifyType.StatusMessage);
printer = await DeviceHelpers.GetFirstReceiptPrinterAsync();
if (printer != null)
{
rootPage.NotifyUser("Got Printer with Device Id : " + printer.DeviceId, NotifyType.StatusMessage);
return(true);
}
else
{
rootPage.NotifyUser("No Printer found", NotifyType.ErrorMessage);
return(false);
}
}
return(true);
}
/// <summary>
/// Find the first receipt printer and create two instances of it.
/// </summary>
/// <returns></returns>
private async Task <bool> FindReceiptPrinterInstances()
{
if (printerInstance1 == null || printerInstance2 == null)
{
rootPage.NotifyUser("Finding printer", NotifyType.StatusMessage);
printerInstance1 = await DeviceHelpers.GetFirstReceiptPrinterAsync();
if (printerInstance1 != null)
{
rootPage.NotifyUser("Got Printer Instance 1 with Device Id : " + printerInstance1.DeviceId, NotifyType.StatusMessage);
// Create another instance of the same printer.
if (printerInstance2 != null)
{
printerInstance2.Dispose();
printerInstance2 = null;
}
printerInstance2 = await PosPrinter.FromIdAsync(printerInstance1.DeviceId);
if (printerInstance2 != null)
{
rootPage.NotifyUser("Got Printer Instance 2 with Device Id : " + printerInstance2.DeviceId, NotifyType.StatusMessage);
return(true);
}
else
{
rootPage.NotifyUser("Couldn't create second instance of printer.", NotifyType.StatusMessage);
}
return(false);
}
else
{
rootPage.NotifyUser("No Printer found", NotifyType.ErrorMessage);
return(false);
}
}
return(true);
}