In my silverlight I have the need to modify PDF files. I usually use Itext libraries for this kind of thing but I am seeing that I cannot reference .NET libraries in Silverlight. Is there any workaround to get the iText functions I need in Silverlight?
Your question is a duplicate of this one, how can I use non-silverlight assemblies in silverlight.
As a work around I would suggest the following for using your itext library. Create a service to do your PDF file modification and then use it via WCF. First upload the PDF file to the server from the Silverlight application. Then call a method on the service using the uploaded path.
public void EditPdf(string pdfLocation)
{
var document = new Document();
PdfWriter.GetInstance(document, new FileStream(pdfLocation,FileMode.CreateNew));
document.Open();
document.Add(new Paragraph("Hello World"));
document.Close();
}
Then retrieve the PDF for the user via the Silverlight client.
Related
I've got a WPF application I'm building. The solution contains a WPF control library project called CustomControls. There's a folder under the CustomControls project folder called Layouts. There's an XML file in that folder called OnscreenLayout.xml. The Build Action property for this file is set to Embedded Resource.
I'm trying to load that file into a stream in the code behind and pass the stream on to a method of a third party library class. The code in question looks like this:
OnscreenKeyboard.DefaultLayout = FPS.VirtualKeyboard.KeyboardLayout.Create(
App.GetResourceStream(
new Uri( #"/CustomControls;component/Layouts/OnscreenLayout.xml",
UriKind.Relative ) ).Stream );
When this code runs, it throws an IOException with the message
Cannot locate resource 'layouts/onscreenlayout.xml'.
I've even tried using this string for the Uri:
#"pack://application:,,,/CustomControls;component/Layouts/OnscreenLayout.xml"
But no joy. What am I doing wrong?
Edit: I have even tried changing the build action for the file from "Embedded Resource" to "Resource" and it still doesn't work.
Thanks
Tony
Only Content and Resource build actions are valid for resource files used in WPF application.
Please avoid other build actions such as Embedded Resource - this will work as well with appropriate API, but it is not favored by WPF.
I'm looking for a simple control that will allow the user to upload an image (or any file, really.) However, I'm not seeing it in the VS 2010 control toolbox. Is there something I'm overlooking? What's the idiomatic way to do file upload?
I am developing a Silverlight app hosted in a ASP.NET page from Windows Azure.
Thanks. I'm new to Silverlight.
The most widely used file upload control suggested by Tim Huer is the sl file uploader. It allows you uploading through wcf or asp.net handler. It supports multiple files, a lite version for single file uploads.
I have developed a control that should help you in your effort: Parallel upload to Azure via Silverlight Control
I added a Silverlight application to my ASP.NET website. Visual Studio made a new silverlight project and added its xap to the ClientBin folder under the project of my website. So both the projects are under one solution.
My Silverlight app is supposed to read an xml file and I was unable to make it access the file from the client bin folder under the website project. Adding a reference to that project does not work since it says only references to other silverlight applications can be added. Right now its working when the file is under the silverlight project but not when it is under the website project.
how can I make it read the file from website project?
The project structure is
WEBSITE1 (solution)
-WEBSITE1 (project)
-ClientBin
-file0.xml
-silverlightchart.xap
-SilverlightChart
-file1.xml
I can access file1.xml using
XDocument document = XDocument.Load("file1.xml");
I want to access file0.xml but no path works for me, for e.g,
XDocument document = XDocument.Load("~/ClientBin/file0.xml");
and WEBSITE1 is the startup project
You should be able to read a file from the ClientBin folder simply enough without needing to do anything special. At a guess I would say the you have accidentally set the Silverlight application as the startup project. In this scenario you want the website to be the startup project then either have the Silverlight apps test page marked as the start page or to navigate to the silverlight page once the browser has started.
Edit
The problem you have is that the Load method is synchronous but Silverlight does not support synchronous access to web resources. Hence passing a Uri to the Load method will only work if the that Uri can be fulfilled by content in the Xap. Thats why an Xml file in the silverlight project works because it ends up in the Xap.
To fetch Xml from the site you need to do this:-
WebClient client = new WebClient();
client.DownloadStringCompleted += (s, args) =>
{
XDocument document = XDocument.Load(args.result);
SomeFunctionToContinueWithDocumentProcess(document);
}
client.DownloadStringAsync(new Uri("file0.xml", UriKind.Relative);
// code exits here but _document won't be loaded yet
I am beginner in silverlight..I have created a silverlight project. When a new silverlight project is created it is automatically creating a silverlight application and one web application. I have added a class in both applications. Now I want to access a method of web application class into silverlight application class. Is it possible? I have tried to add web application reference to silverlight but VS is not allowing. Is there any another way to do??
What you need is called WCF. A really simple tutorial that should get you going is found here: How to call WCF methods from Silverlight controls
Fundementally WCF allows the silverlight client to make method calls on a class instance hosted on the web site.
Yes it is possible, but not in the normal way. A Silverlight assembly can only reference another Silverlight assembly (this is a limitation of VS2008, i don't know if it has been changed in VS2010).
What you need to do is add an existing file to your Silverlight project, when the file browse dialog opens you navigate to the class file you want to reuse, but instead of just clicking the Add button, click on the little down arrow on the button and choose Add as link - now the file will "exist" in both projects and can be used in both.
If you are going to do this repeatedly though, you will want to move those shared class files out into a separate assembly, do a project reference from your web app, and have the equivalent Silverlight class library mirroring it (sharing the files as links), and then project reference that Silverlight class library from your Silverlight app.
I'm making a WebPart for SharePoint that will instantiate a Silverlight UserControl and feed it some data. My problem is that when I have created my sample-WebPart and just instantiate a Silverlight control, the webpart, when added to a page or displayed in the webpart gallery, instead of rendering blank, renders an error page saying "File Not Found". No clue in the logfiles to what file was not found or why this error is thrown. Here is my code:
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.SilverlightControls;
namespace TestSLWP {
public class CustomWebPart1 : WebPart {
protected override void CreateChildControls() {
Label lblHello = new Label();
lblHello.Text = "Hello";
Controls.Add(lblHello);
Silverlight sl = new Silverlight();
}
}
}
I've added references to System.Web.Extensions and System.Web.Silverlight to the project. They are in the GAC, and the webpart is written and compiled on the same computer that SharePoint resides. If I change the CreateChildControls() to be:
protected override void CreateChildControls() {
Silverlight sl = new Silverlight();
sl.ID = "CustomWebPart1SL";
sl.Source = "/Silverlight/CustomWebPart.xap";
this.Controls.Add(sl);
}
I get the same error. Also if I remove the first slash in sl.Source I get the same error, even though the file is present in a virtual directory in the same application pool as SharePoint. I therefore, and because the error comes with just instantiating the Silverlight object, believe that the file that cannot be found is not my XAP.
What file can't SharePoint find and what can I do about it?
Here's the error message:
http://www.freeimagehosting.net/uploads/2dca8dbdfb.png
Hi I found a complete walk through on how to get Silverlight web parts get running on your application: http://www.vbforums.com/archive/index.php/t-557072.html
As you can see there are added some more things to the web.config beside your assembly registration.
Enabling SilverLight requires a lagre amount of web config modifications. Did you add those?
There could be the problem with your storage folder with silverlight control. You must register path to this storage as safe in web.config (for example find in web.config line with "~/controltemplates").