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MSApp.getHtmlPrintDocumentSourceAsync - JavaScript UWP app printing

2017 Oct 11, 5:49

The documentation for printing in JavaScript UWP apps is out of date as it all references MSApp.getHtmlPrintDocumentSource but that method has been replaced by MSApp.getHtmlPrintDocumentSourceAsync since WinPhone 8.1.

Background

Previous to WinPhone 8.1 the WebView's HTML content ran on the UI thread of the app. This is troublesome for rendering arbitrary web content since in the extreme case the JavaScript of some arbitrary web page might just sit in a loop and never return control to your app's UI. With WinPhone 8.1 we added off thread WebView in which the WebView runs HTML content on a separate UI thread.

Off thread WebView required changing our MSApp.getHtmlPrintDocumentSource API which could no longer synchronously produce an HtmlPrintDocumentSource. With WebViews running on their own threads it may take some time for them to generate their print content for the HtmlPrintDocumentSource and we don't want to hang the app's UI thread in the interim. So the MSApp.getHtmlPrintDocumentSource API was replaced with MSApp.getHtmlPrintDocumentSourceAsync which returns a promise the resolved value of which is the eventual HtmlPrintDocumentSource.

Sample

However, the usage of the API is otherwise unchanged. So in sample code you see referencing MSApp.getHtmlPrintDocumentSource the sample code is still reasonable but you need to call MSApp.getHtmlPrintDocumentSourceAsync instead and wait for the promise to complete. For example the PrintManager docs has an example implementing a PrintTaskRequested event handler in a JavaScript UWP app.

    function onPrintTaskRequested(printEvent) {    
var printTask = printEvent.request.createPrintTask("Print Sample", function (args) {
args.setSource(MSApp.getHtmlPrintDocumentSource(document));
});

Instead we need to obtain a deferral in the event handler so we can asynchronously wait for getHtmlPrintDocumentSourceAsync to complete:

    function onPrintTaskRequested(printEvent) {    
var printTask = printEvent.request.createPrintTask("Print Sample", function (args) {
const deferral = args.getDeferral();
MSApp.getHtmlPrintDocumentSourceAsync(document).then(htmlPrintDocumentSource => {
args.setSource(htmlPrintDocumentSource);
deferral.complete();
}, error => {
console.error("Error: " + error.message + " " + error.stack);
deferral.complete();
});
});
PermalinkCommentsjavascript MSApp printing programming uwp webview win10 windows

Tweet from David Risney

2016 Nov 4, 4:08
@David_Risney Example graph https://raw.githubusercontent.com/david-risney/WinMDGraph/master/examples/3/3.dot.png  of the Windows .Services.Maps namespace
PermalinkComments

Tweet from David Risney

2016 Nov 4, 4:05
WinMDGraph graphs relationships between WinRT APIs https://github.com/david-risney/WinMDGraph/ . My initial version is up.
PermalinkComments

Parsing WinMD with .NET reflection APIs

2016 Nov 2, 6:13

Parsing WinMD files, the containers of WinRT API metadata, is relatively simple using the appropriate .NET reflection APIs. However, figuring out which reflection APIs to use is not obvious. I've got a completed C sharp class parsing WinMD files that you can check out for reference.

Use System.Reflection.Assembly.ReflectionOnlyLoad to load the WinMD file. Don't use the normal load methods because the WinMD files contain only metadata. This will load up info about APIs defined in that WinMD, but any references to types outside of that WinMD including types found in the normal OS system WinMD files must be resolved by the app code via the System.Reflection.InteropServices.WindowsRuntimeMetadata.ReflectionOnlyNamespaceResolve event.

In this event handler you must resolve the unknown namespace reference by adding an assembly to the NamespaceResolveEventArgs's ResolvedAssemblies property. If you're only interested in OS system WinMD files you can use System.Reflection.InteropServices.WindowsRuntimeMetadata.ResolveNamespace to turn a namespace into the expected OS system WinMD path and turn that path into an assembly with ReflectionOnlyLoad.

PermalinkComments.net code programming winmd winrt

Retweet of KimZetter

2015 Dec 21, 7:02
"This is the kind of vulnerability that makes applied cryptographers cry tears of joy." - http://bit.ly/1O5VoSR  #JuniperVPNbackdoor
PermalinkComments

Retweet of Pinboard

2015 Dec 13, 2:34
Imagine a world where FBI director Comey talked about guns the way he talks about cryptography
PermalinkComments

Tweet from David_Risney

2015 Nov 18, 2:53
Old time tintype photograph of Adam Savage looks really good. Photographer Michael Shindler explains & demos process https://www.youtube.com/watch?v=T_gQgkCfj7w …
PermalinkComments

Tweet from David_Risney

2015 Jul 20, 3:21
Difficulties of props in entertainment: matching viewer expectations not reality, HD, trademarks, and currency. http://www.bloomberg.com/graphics/2015-property-master/ …
PermalinkComments

Retweet of covernode

2015 Apr 6, 6:26
Shut it down infographics nerds, the greatest chart possible has been made pic.twitter.com/LZr6KRwhJP
PermalinkComments

Retweet of shaver

2015 Feb 20, 4:19
Facebook Security published a note with some info on Superfish: https://www.facebook.com/notes/protect-the-graph/windows-ssl-interception-gone-wild/1570074729899339 …
PermalinkComments

Tweet from David_Risney

2015 Feb 12, 12:03
Collection of mobile 3d printer robots build large structures: http://monograph.io/iaac/minibuilders … (aka the future)
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WIRED: Our exclusive hands-on with Microsoft’s unbelievable new holographic goggles

2015 Jan 20, 9:15
WIRED        ✔ @WIRED :
Our exclusive hands-on with Microsoft’s unbelievable new holographic goggles http://wrd.cm/1CBSqwN  pic.twitter.com/VufKcTcSfE
PermalinkComments

Debugging LoadLibrary Failures - Junfeng Zhang's Windows Programming Notes - Site Home - MSDN Blogs

2014 Feb 25, 2:22

How to turn on debug logging for LoadLibrary to diagnose failures. For example, see where in the dependency graph of a DLL LoadLibrary ran into issues.

PermalinkCommentstechnical win32 windows debugging loadlibrary

Where the best designers go to find photos and graphics

2014 Jan 5, 3:09

List of useful free or CC licensed photography and icon sites.

PermalinkCommentsfree cc photo photography icon

picjumbo

2014 Jan 5, 2:22
/wp-content/uploads/IMG_3811-1300x866.jpg"/>

picjumbo

totally free photos for your commercial & personal works

 

PermalinkCommentsphoto free photography

App Developer Agreement (Windows)

2013 Jun 21, 4:20

The Windows Store supports refunds and as the developer you are responsible for fulfilling those refunds even after Microsoft pays you. That seems reasonable I suppose but there’s no time limit mentioned…

"g. Reconciliation and Offset. You are responsible for all costs and expenses for returns and chargebacks of your app, including the full refund and chargeback amounts paid or credited to customers. Refunds processed after you receive the App Proceeds will be debited against your account. Microsoft may offset any amounts owed to Microsoft (including the refund and chargeback costs described in this paragraph) against amounts Microsoft owes you. Refunds processed by Microsoft can only be initiated by Microsoft; if you wish to offer a customer a refund, directly, you must do so via your own payment processing tools."

PermalinkCommentsmicrosoft developement software windows money

SIGGRAPH 2013 : Technical Papers Preview Trailer (by...

2013 May 24, 4:46


SIGGRAPH 2013 : Technical Papers Preview Trailer (by ACMSIGGRAPH)

PermalinkCommentstechnical video cgi

A Slower Speed of Light Official Trailer — MIT Game Lab (by...

2012 Nov 13, 7:41


A Slower Speed of Light Official Trailer — MIT Game Lab (by Steven Schirra)

“A Slower Speed of Light is a first-person game in which players navigate a 3D space while picking up orbs that reduce the speed of light in increments. A custom-built, open-source relativistic graphics engine allows the speed of light in the game to approach the player’s own maximum walking speed. Visual effects of special relativity gradually become apparent to the player, increasing the challenge of gameplay. These effects, rendered in realtime to vertex accuracy, include the Doppler effect; the searchlight effect; time dilation; Lorentz transformation; and the runtime effect.

A production of the MIT Game Lab.

Play now for Mac and PC! http://gamelab.mit.edu/games/a-slower-speed-of-light/

PermalinkCommentsscience game video-game mit 3d light-speed

IKEA's New Catalogs: Less Pine, More Pixels - WSJ.com

2012 Aug 24, 3:15

CGI for the IKEA catalog:

That couch catching your eye in the 2013 edition of IKEA’s new catalog may not be a couch at all. It is likely the entire living room was created by a graphic artist. In fact, much of the furniture and settings in the 324-page catalog are simply a collection of pixels and polygons arranged on a computer.

PermalinkComments3d photo graphics ikea

(via Pareidoloop) “Phil McCarthy’s Pareidoloop...

2012 Aug 6, 4:11


(via Pareidoloop)

“Phil McCarthy’s Pareidoloop overlays randomly generated polygons on top of one another until facial recognition software recognizes a human face. Can’t sleep, at SIGGRAPH! [via @Brandonn]”

PermalinkCommentstechnical images facial-recognition siggraph
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