/// <summary>
/// Standard Cancel handler for a background task
/// </summary>
/// <param name="sender"></param>
/// <param name="reason"></param>
private void OnCanceled(IBackgroundTaskInstance sender, BackgroundTaskCancellationReason reason)
{
//
// Indicates that the background task is canceled.
//
UtilitiesLibrary.SendToastNotification("Background Print Workflow Task " + sender.Task.Name + " received a Cancel Request, reason " + reason.ToString() + ", instance " + sender.InstanceId.ToString(), null);
Task.Delay(60000);
}
/// <summary>
/// Handle the Print Task Submitted Event using the XPS Object Model
/// Raised after the UI part of the app has, optionally, had its OnSetupRequested and OnXpsDataAvailable called.
/// This event provides all data already provided on the OnSetupRequested event. It additionally provides
/// a reference to the PrintWorkflowObjectModelTargetPackage interface enabling manipulation of the output via the XPS object model.
/// </summary>
/// <param name="sessionManager">Session manager</param>
/// <param name="printTaskSubmittedArgs">Has the Controller, Content, and Configuration</param>
private void OnXpsOMPrintSubmitted(PrintWorkflowBackgroundSession sessionManager, PrintWorkflowSubmittedEventArgs printTaskSubmittedArgs)
{
// Take out a deferral whilst the OM generation happens
Deferral submittedDeferral = printTaskSubmittedArgs.GetDeferral();
// Send a toast
UtilitiesLibrary.SendToastNotification("Background Print Workflow printing started for " + printTaskSubmittedArgs.Operation.Configuration.JobTitle, null);
// Get the source XPS OM content
PrintWorkflowObjectModelSourceFileContent xpsOMSourceContent = printTaskSubmittedArgs.Operation.XpsContent.GetSourceSpoolDataAsXpsObjectModel();
// Send the print ticket if available to get the Target
PrintWorkflowTarget target = printTaskSubmittedArgs.GetTarget(null);
// Get the Target Package
PrintWorkflowObjectModelTargetPackage targetPackage = target.TargetAsXpsObjectModelPackage;
// Create a Windows Runtime XPS Receiver callback object via the XpsOMRuntimeComponent, which implements
// the IPrintWorkflowXpsReceiver interface and PrintWorkflowObjectModelSourceFileContentNative. It is in the
// IPrintWorkflowXpsReceiver implementation that the output is actually modified
var xpsReceiver = new PrintWorkflowObjectModelSourceFileContentNative(xpsOMSourceContent, targetPackage);
// Signal for the XPS OM Generation
PrintWorkflowSubmittedStatus submittedStatus = PrintWorkflowSubmittedStatus.Failed;
try
{
// Get the watermark text and pass that to the xpsReceiver
string watermarkText = localStorage.GetWatermarkTextFromLocalStorage();
if (!suppressUI)
{
// Delete the local storage setting if this is in a Workflow session context and not a standalone run of the app
localStorage.DeleteWatermarkTextFromLocalStorage();
}
xpsReceiver.SetWatermarkText(watermarkText);
// Get the image file information, if set, and pass that to the xpsReceiver
localStorage.GetImagePropertiesFromLocalStorage(out string imageFile, out double dpiX, out double dpiY, out int imageWidth, out int imageHeight);
if (imageFile != null)
{
xpsReceiver.SetImageProperties(imageFile, dpiX, dpiY, imageWidth, imageHeight);
if (!suppressUI)
{
localStorage.DeleteImagePropertiesFromLocalStorage();
}
}
// Start the OM generation
xpsReceiver.StartXpsOMGeneration();
// At this point, the xpsReceiver will receive callbacks when the XPS OM objects are available
// Wait till the Whole XPS OM is generated and written to the package writer
if (xpsReceiver.WaitForOMGeneration())
{
UtilitiesLibrary.SendToastNotification("Background Print Workflow printing successfully completed for " + printTaskSubmittedArgs.Operation.Configuration.JobTitle, null);
submittedStatus = PrintWorkflowSubmittedStatus.Succeeded;
}
else
{
UtilitiesLibrary.SendToastNotification("Background Print Workflow printing failed for " + printTaskSubmittedArgs.Operation.Configuration.JobTitle, null);
}
}
catch (Exception ex)
{
string errorMessage = ex.Message;
UtilitiesLibrary.SendToastNotification("Background Print Workflow printing encountered an exception: " + errorMessage, null);
}
finally
{
// All done, let the controller whether it should close the job stream or abort it
printTaskSubmittedArgs.Operation.Complete(submittedStatus);
// Complete the deferral taken out at the start of this function
submittedDeferral.Complete();
// Complete the deferral taken out at the start of Run()
runDeferral.Complete();
}
}