My WebBrowser object will not Navigate() to the link I give it.
The object remains empty when I run it.
When I put the url into the url property though, it successfully loads the link.
namespace Program
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
webbMain.Navigate("https://twitter.com/login");
}
}
}
You can try the following:
You can try the following in Page_Load:
WebBrowser wbbMain= new WebBrowser();
wbbMain.AllowNavigation = true;
wbbMain.Navigate("http://www.stackoverflow.com");
Also, you can try to provide override for DocumentCompleted event.
If nothing works, then see if Internet explorer is isntalled. If its not installed then web brower may not work.
Related
Currently i have a winform where i need to open report in WebBrowser Control. I am using impersonation method to view as different user. But somehow the WebBrowser will pop up a windows security authentication for me to enter my credential. When i input the credential as someone that has the right to view the report (not my credential) it will just show a blank page. Not even a message that says:
The permissions granted to user 'Domain\first.last' are insufficient for performing this operation. (rsAccessDenied)
The First Page:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
using (new ImpersonateUser("TestUsername", Environment.UserDomainName, "TestPassword"))
{
Form2 reportForm = new Form2();
reportForm.Text = "Test";
reportForm.GetReportUrl("http://url/");
reportForm.ShowDialog();
}
}
}
The Second Page:
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
label1.Text = Environment.UserName;
}
private void Form2_Load(object sender, EventArgs e)
{
webBrowser1.Refresh();
}
public void GetReportUrl(string repUrl)
{
webBrowser1.Url = new Uri(repUrl);
}
}
Can someone explains to me why is this happening? And how i can fix this? Thank you.
But i didn't get why you have to do impersonation to launch a form, from the above code you are not doing any by doing impersonation.
if you are facing the problem in launching a application under user profile then the below link will be helpful.
WTSQueryUserToken returning FALSE
I have created a C# Windows Form project in Visual Studio and I am trying to work with an Excel workbook via interop.excel. I have created a custom "excel class" and created an object of it in my Form1.
What I am struggling with is whether it is possible to open an excel workbook via a button press, i.e. create the class object from a button press, and then be able to use that object in other button presses.
Two versions of code are shown below. One works，one does not. The one that works just opens the Excel workbook when the program is launched. The other attempts to use a button press on the form to open the workbook after the program is launched. In the code that does not work, the object does not exist in the current context.
Any help on how to make the button press code work is most appreciated!
This code works:
namespace XLtest1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
ExcelClass ex = new ExcelClass(#"C:\path\TestBook.xlsx", 1);
private void ReadCell_Click(object sender, EventArgs e)
{
ex.ReadCell();
}
...
This code does not:
namespace XLtest1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public void OpenFile()
{
ExcelClass ex = new ExcelClass(#"C:\path\TestBook.xlsx", 1);
}
private void OpenWorkbook_Click(object sender, EventArgs e)
{
OpenFile();
}
private void ReadCell_Click(object sender, EventArgs e)
{
ex.ReadCell(); // "ex" does not exist in the current context
}
...
You are using a local variable inside ReadCell which has no knowledge of ex.
You could create a variable
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private ExcelClass ex = null; //create your member field here
public void OpenFile()
{
ex = new ExcelClass(#"C:\path\TestBook.xlsx", 1);
}
private void OpenWorkbook_Click(object sender, EventArgs e)
{
OpenFile();
}
private void ReadCell_Click(object sender, EventArgs e)
{
if (ex!= null) {
ex.ReadCell();
} else {
//do nothing, or inform user they have to press other button to open the file
}
}
I think you are asking to be able to reuse the code on another button press? If so would it be an option for you to create a function with the code needed and just call that function inside each button press?
I am new in WP8 development and I am making an app that has a WebBrowserControl to access to my website. I want to save the state of WebBrowser when app comes to background, but I can't do this (i.e. when user wants to re-open application WebBrowser will load last page seen).
My code, based in this, is the following:
WebBrowser properties: Base and Source are empty.
App.xaml.cs:
public partial class App : Application
{
//Url to store current address to maintain state when application is in background
public Uri Url { get; set; }
//Boolean to get if phone has been previously in background
public Boolean firstRun = true;
private void Application_Activated(object sender, ActivatedEventArgs e)
{
IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
Uri currentUrl;
if (settings.TryGetValue("Url", out currentUrl))
Url = (Uri)settings["Url"];
}
private void Application_Deactivated(object sender, DeactivatedEventArgs e)
{
IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
settings["Url"] = Url;
firstRun = false;
settings.Save();
}
MainPage.xaml.cs:
public partial class MainPage : PhoneApplicationPage
{
Uri baseUrl = new Uri("http://my_url");
// Constructor
public MainPage()
{
InitializeComponent();
webBrowser.Navigated += new EventHandler<NavigationEventArgs>(WebBrowserNavigation);
App app = Application.Current as App;
if (app.firstRun)
{
webBrowser.Navigate(baseUrl);
}
}
async void WebBrowserNavigation(Object sender, NavigationEventArgs navArgs)
{
string url = navArgs.Uri.ToString();
App app = Application.Current as App;
app.Url = navArgs.Uri;
}
I think you're confusing bring it to the foreground and relaunching. To bring it back to the foreground press the back button after pressing the windows button. You will see that your application is exactly where you left it. If you re-launch the program by pressing a title or using the start menu, it will start a new instance of it... thus showing your base URL.
So basically FirstRun does not matter in your program. When you launch your program you should grab the last URL by doing this
private void Application_Launching(object sender, LaunchingEventArgs e)
{
// this.FirstRun = true; // doesn't matter
IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
Uri currentUrl;
if (settings.TryGetValue("Url", out currentUrl))
{
Url = (Uri)settings["Url"]; // got the last url
}
else
{
Url = new Uri(#"http://www.msn.com"); // last url not defined, set it to default base
}
}
Save your Last URL in both events
// Code to execute when the application is deactivated (sent to background)
// This code will not execute when the application is closing
private void Application_Deactivated(object sender, DeactivatedEventArgs e)
{
IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
settings["Url"] = Url;
settings.Save();
}
// Code to execute when the application is closing (eg, user hit Back)
// This code will not execute when the application is deactivated
private void Application_Closing(object sender, ClosingEventArgs e)
{
IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
settings["Url"] = Url;
settings.Save();
}
And when your MainPage gets loaded navigate to the saved URL
public MainPage()
{
InitializeComponent();
App myApp = Application.Current as App;
webBrowser.Navigated += new EventHandler<NavigationEventArgs>(WebBrowserNavigation);
webBrowser.Navigate(myApp.Url);
}
Doing it this way, it always saves your state and it doesn't matter if you bring it to the foreground or launch it again from the title or start menu. You can say that you properly tomestoned your WebBrowser URL at this point.
From my Form1 I initialize a class scraper. In the scraper class is an function login. The idea is that that class log's the user in on an website, and returned the web browser so that an logged in webbrowser control is available in Form1.
I've got this code so far: Form1
private void button1_Click(object sender, EventArgs e)
{
Scraper scraper = new Scraper(this);
scraper.login(conf._webLogin);
}
public void updateLoginWeb(WebBrowser web)
{
webBrowser1 = web;
MessageBox.Show("DONE");
}
The conf class:
public WebBrowser _webLogin = new WebBrowser();
The scraper class:
private Form1 parent;
private WebBrowser _web_Login = new WebBrowser();
public Scraper()
{
}
public Scraper(Form1 parent)
: this()
{
this.parent = parent;
}
public void login(WebBrowser web)
{
_web_Login = web;
_web_Login.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(login_DocumentCompleted);
_web_Login.Navigate("http://www.google.com/");
}
private void login_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
//This line is so you only do the event once
if (e.Url != _web_Login.Url)
return;
parent.updateLoginWeb(_web_Login);
}
I use google as test, but nothing works (not even an another site).
The problem is that the webbrowser in the Form isn't updated. It's still an white screen.
What do you guys think of this? Do you know what the problem is or do you guys know an better way to handle this?
I think your problem is that you can not simply assign the webBrowser variable:
webBrowser1 = web;
You are changing the Form1.webBrower1 variable, but the Forms.Controls collection is still pointing to the original webBrowser control.
Can't you just pass Form1.webBrower1 to scraper.login function?:
private void button1_Click(object sender, EventArgs e)
{
Scraper scraper = new Scraper(this);
scraper.login(webBrowser1);
}
public void updateLoginWeb(WebBrowser web)
{
//webBrowser1 = web; // you don't need this anymore
MessageBox.Show("DONE");
}
If you really need to replace your control you can do something like:
public void updateLoginWeb(WebBrowser web)
{
Controls.Remove(webBrowser1);
Controls.Add(web);
webBrowser1 = web; // you don't need this anymore
MessageBox.Show("DONE");
}
But you will probably to set the new webbrowser layout properties manually.
I'm looking to create a very simple program that's only function is to display my website. So basically the program would be like an iframe of the website. What is the best way to achieve this?
You can't use iFrame since it is a browser technology. You must use a web browser as follows, I believe:
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication10
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// When the form loads, open this web page.
webBrowser1.Navigate("http://www.dotnetperls.com/");
}
private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
// While the page has not yet loaded, set the text.
this.Text = "Navigating";
}
private void webBrowser1_DocumentCompleted(object sender,
WebBrowserDocumentCompletedEventArgs e)
{
// Better use the e parameter to get the url.
// ... This makes the method more generic and reusable.
this.Text = e.Url.ToString() + " loaded";
}
}
}
Ref. http://www.dotnetperls.com/webbrowser
Note: Example is in C#.
Check this out for C++ What embedded browser for C++ project?