Develop Reference

How to print document in PDFnet /PDFTron

In a windows store app project , I have a pdftron.PDF.PDFViewCtrl MyPDFViewCtrl
I then have a button that when I tap, I call a method that should be used to print the document loaded to the MyPDFViewCtrl
I tried with something like this:
private void Print_Tapped(object sender, Windows.UI.Xaml.Input.TappedRoutedEventArgs e)
{
pdftron.PDF.PDFPrintManager MyPrintManager;
MyPrintManager = pdftron.PDF.PDFPrintManager.GetInstance();
Windows.ApplicationModel.Resources.ResourceLoader loader = ResourceLoader.GetForCurrentView("Printing");
MyPrintManager.SetResourceLoader(loader);
MyPrintManager.UnRegisterForPrintingContract();
MyPrintManager.AddStandardPrintOption(Windows.Graphics.Printing.StandardPrintTaskOptions.MediaSize);
MyPrintManager.AddStandardPrintOption(Windows.Graphics.Printing.StandardPrintTaskOptions.Orientation);
MyPrintManager.AddUserOptionPageRange();
MyPrintManager.RegisterForPrintingContract(docpdf, docpdf.GetDocInfo().GetTitle());
}
But when I press the button nothing happens.
Am I doing it wrong?

Open multiple pages in WebBrowser and send a command to all of them

I have a winform app with the following functionality:
Has a multiline textbox that contain one URL on each line - about 30 URLs (each URL is different but the webpage is the same (just the domain is different);
I have another textbox in which I can write a command and a button that sends that command to an input field from the webpage.
I have a WebBrowser controller ( I would like to do all the things in one controller )
The webpage consist of a textbox and a button which I want to be clicked after I insert a command in that textbox.
My code so far:
//get path for the text file to import the URLs to my textbox to see them
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog fbd1 = new OpenFileDialog();
fbd1.Title = "Open Dictionary(only .txt)";
fbd1.Filter = "TXT files|*.txt";
fbd1.InitialDirectory = #"M:\";
if (fbd1.ShowDialog(this) == DialogResult.OK)
path = fbd1.FileName;
}
//import the content of .txt to my textbox
private void button2_Click(object sender, EventArgs e)
{
textBox1.Lines = File.ReadAllLines(path);
}
//click the button from webpage
private void button3_Click(object sender, EventArgs e)
{
this.webBrowser1.Document.GetElementById("_act").InvokeMember("click");
}
//parse the value of the textbox and press the button from the webpage
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
newValue = textBox2.Text;
HtmlDocument doc = this.webBrowser1.Document;
doc.GetElementById("_cmd").SetAttribute("Value", newValue);
}
Now, how can I add all those 30 URLs from my textbox in the same webcontroller so that I can send the same command to all of the textboxes from all the webpages and then press the button for all of them ?
//EDIT 1
So, I have adapted #Setsu method and I've created the following:
public IEnumerable<string> GetUrlList()
{
string f = File.ReadAllText(path); ;
List<string> lines = new List<string>();
using (StreamReader r = new StreamReader(f))
{
string line;
while ((line = r.ReadLine()) != null)
lines.Add(line);
}
return lines;
}
Now, is this returning what it should return, in order to parse each URL ?

If you want to keep using just 1 WebBrowser control, you'd have to sequentially navigate to each URL. Note, however, that the Navigate method of the WebBrowser class is asynchronous, so you can't just naively call it in a loop. Your best bet is to implement an async/await pattern detailed in this answer here.
Alternatively, you CAN have 30 WebBrowser controls and have each one navigate on its own; this is roughly equivalent to having 30 tabs open in modern browsers. Since each WebBrowser is doing identical work, you can just have 1 DocumentCompleted event written to handle a single WebBrowser, and then hook up the others to the same event. Do note that the WebBrowser control has a bug that will cause it to gradually leak memory, and the only way to solve this is to restart the application. Thus, I would recommend going with the async/await solution.
UPDATE:
Here's a brief code sample of how to do the 30 WebBrowsers way (untested as I don't have access to VS right now):
List<WebBrowser> myBrowsers = new List<WebBrowser>();
public void btnDoWork(object sender, EventArgs e)
{
//This method starts navigation.
//It will call a helper function that gives us a list
//of URLs to work with, and naively create as many
//WebBrowsers as necessary to navigate all of them
IEnumerable<string> urlList = GetUrlList();
//note: be sure to sanitize the URLs in this method call
foreach (string url in urlList)
{
WebBrowser browser = new WebBrowser();
browser.DocumentCompleted += webBrowserDocumentCompleted;
browser.Navigate(url);
myBrowsers.Add(browser);
}
}
private void webBrowserDocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
//check that the full document is finished
if (e.Url.AbsolutePath != (sender as WebBrowser).Url.AbsolutePath)
return;
//get our browser reference
WebBrowser browser = sender as WebBrowser;
//get the string command from form TextBox
string command = textBox2.Text;
//enter the command string
browser.Document.GetElementById("_cmd").SetAttribute("Value", command);
//invoke click
browser.Document.GetElementById("_act").InvokeMember("click");
//detach the event handler from the browser
//note: necessary to stop endlessly setting strings and clicking buttons
browser.DocumentCompleted -= webBrowserDocumentCompleted;
//attach second DocumentCompleted event handler to destroy browser
browser.DocumentCompleted += webBrowserDestroyOnCompletion;
}
private void webBrowserDestroyOnCompletion(object sender, WebBrowserDocumentCompletedEventArgs e)
{
//check that the full document is finished
if (e.Url.AbsolutePath != (sender as WebBrowser).Url.AbsolutePath)
return;
//I just destroy the WebBrowser, but you might want to do something
//with the newly navigated page
WebBrowser browser = sender as WebBrowser;
browser.Dispose();
myBrowsers.Remove(browser);
}

simulate click button after opening webpage

I have a requirement where I open a webpage using
WebRequest wr = WebRequest.Create(uri);
This webpage has a download button which needs to be clicked to download a zip file to my local directory. I do not know the URL for this download button, if i mouse over it it just shows the .aspx address.
Now how can I simulate this click so I can download the file?

using System;
using System.Windows.Forms;
namespace SampleBrowserautomate
{
public partial class Form1 : Form
{
// first of all, insert web browser control and button control into your form
string target = "https://www.facebook.com/login.php";
public Form1()
{
InitializeComponent();
}
private void btnGo_Click(object sender, EventArgs e)
{
webBrowser1.Navigate(target);
}
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser b = (WebBrowser)sender;
b.Document.GetElementById("email").InnerText = "helloworld#gmail.com";
b.Document.GetElementById("pass").InnerText = "HelloWorld";
b.Document.GetElementById("u_0_1").InvokeMember("click");
}
}
}
Another examples on msdn
http://msdn.microsoft.com/en-us/library/System.Windows.Forms.HtmlElement(v=vs.110).aspx
http://msdn.microsoft.com/en-us/library/system.windows.forms.htmlelement.setattribute(v=vs.110).aspx

What about UI automation? Is this what you're after?
http://msdn.microsoft.com/en-us/library/dd286726.aspx
EDIT: How about Web UI automation?
http://msdn.microsoft.com/en-us/library/hh404082.aspx

So I am working on this in between things, but check this out.
You can fire the client side event of that button using this javascript:
__doPostBack('DownloadButton','OnClick');
This will work with the 'javascript:' header in the chrome console. Now you could probably automate this using greasemonkey(firefox) or another add on for chrome.

.NET C#: WebBrowser control Navigate() does not load targeted URL

I'm trying to programmatically load a web page via the WebBrowser control with the intent of testing the page & it's JavaScript functions. Basically, I want to compare the HTML & JavaScript run through this control against a known output to ascertain whether there is a problem.
However, I'm having trouble simply creating and navigating the WebBrowser control. The code below is intended to load the HtmlDocument into the WebBrowser.Document property:
WebBrowser wb = new WebBrowser();
wb.AllowNavigation = true;
wb.Navigate("http://www.google.com/");
When examining the web browser's state via Intellisense after Navigate() runs, the WebBrowser.ReadyState is 'Uninitialized', WebBrowser.Document = null, and it overall appears completely unaffected by my call.
On a contextual note, I'm running this control outside of a Windows form object: I do not need to load a window or actually look at the page. Requirements dictate the need to simply execute the page's JavaScript and examine the resultant HTML.
Any suggestions are greatly appreciated, thanks!

You should handle the WebBrowser.DocumentComplete event, once that event is raised you will have the Document etc.
wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);
private void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser wb = sender as WebBrowser;
// wb.Document is not null at this point
}
Here is a complete example, that I quickly did in a Windows Forms application and tested.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
WebBrowser wb = new WebBrowser();
wb.AllowNavigation = true;
wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);
wb.Navigate("http://www.google.com");
}
private void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser wb = sender as WebBrowser;
// wb.Document is not null at this point
}
}
Edit: Here is a simple version of code that runs a window from a console application. You can of course go further and expose the events to the console code etc.
using System;
using System.Windows;
using System.Windows.Forms;
namespace ConsoleApplication1
{
class Program
{
[STAThread]
static void Main(string[] args)
{
Application.Run(new BrowserWindow());
Console.ReadKey();
}
}
class BrowserWindow : Form
{
public BrowserWindow()
{
ShowInTaskbar = false;
WindowState = FormWindowState.Minimized;
Load += new EventHandler(Window_Load);
}
void Window_Load(object sender, EventArgs e)
{
WebBrowser wb = new WebBrowser();
wb.AllowNavigation = true;
wb.DocumentCompleted += wb_DocumentCompleted;
wb.Navigate("http://www.bing.com");
}
void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
Console.WriteLine("We have Bing");
}
}
}

You probably need to host the control in a parent window. You can do this without breaking requirements by simply not showing the window that hosts the browser control by moving it off screen. It might also be useful for development to "see" that it does actually load something for testing, verification etc.
So try:
// in a form's Load handler:
WebBrowser wb = new WebBrowser();
this.Controls.Add(wb);
wb.AllowNavigation = true;
wb.Navigate("http://www.google.com/");
Also check to see what other properties are set on the WebBrowser object when you instantiate it via the IDE. E.g. create a Form, drop a browser control onto it and then check the form's designer file to see what code is generated. You might be missing some key property that needs to be set. I've discovered many-an-omission in my code in this way and also learned how to properly instantiate visual objects programmatically.
P.S. If you do use a host window, it should only be visible during development. You would hide in some manner for production.
Another approach:
You could go "raw" by tryiing something like this:
System.Net.WebClient wc = new System.Net.WebClient();
System.IO.StreamReader webReader = new System.IO.StreamReader(
wc.OpenRead("http://your_website.com"));
string webPageData = webReader.ReadToEnd();
...then RegEx or parse webPageData for what you need. Or do you need the jscript in the page to actually execute? (Which should be possible with .NET 4.0)

I had this problem, and I did not realize that I had uninstalled Internet Explorer. If you have, nothing will ever happen, since the WebBrowser control only instantiates IE.

The Webbrowser control is just a wrapper around Internet Explorer.
You can set in onto an invisible Windows Forms window to completely instantiate it.

Printing WebBrowser control content

I'm absolutely new to printing in .NET. I would like to print a page that is displayed in WebBrowser control. How do I do that?

MSDN has an article about this, however their code example demonstrates how use the WebBrowser control to print a Web page without displaying it. :
How to: Print with a WebBrowser Control
The c# code:
private void PrintHelpPage()
{
// Create a WebBrowser instance.
WebBrowser webBrowserForPrinting = new WebBrowser();
// Add an event handler that prints the document after it loads.
webBrowserForPrinting.DocumentCompleted +=
new WebBrowserDocumentCompletedEventHandler(PrintDocument);
// Set the Url property to load the document.
webBrowserForPrinting.Url = new Uri(#"\\myshare\help.html");
}
private void PrintDocument(object sender,
WebBrowserDocumentCompletedEventArgs e)
{
// Print the document now that it is fully loaded.
((WebBrowser)sender).Print();
// Dispose the WebBrowser now that the task is complete.
((WebBrowser)sender).Dispose();
}