I'm writing an application that I would like to have run under either Windows or Linux. Since it is a text application, the obvious choice for rendering and user interaction is to use html in a WebBrowser control. This all works great using Mono in Windows, but I'm absolutely stumped on how to get it to work using Mono in Linux. I'm running Linux Mint 17, have MonoDevelop and Firefox installed. The following code snippet compiles and runs, but when the application launches, wbMain does not show up. The application dies when trying to render an html string using wbMain.
private System.Windows.Forms.Panel pnlMain;
private Mono.WebBrowser.IWebBrowser wbMain;
private System.Windows.Forms.Button btnGo;
this.pnlMain = new System.Windows.Forms.Panel();
this.wbMain = Mono.WebBrowser.Manager.GetNewInstance();
this.wbMain.Activate();
this.btnGo = new System.Windows.Forms.Button();
this.pnlMain.SuspendLayout();
this.SuspendLayout();
//
// pnlMain
//
this.pnlMain.Controls.Add((System.Windows.Forms.Control)this.wbMain.Window);
this.pnlMain.Controls.Add(this.btnGo);
this.pnlMain.Location = new System.Drawing.Point(12, 1);
this.pnlMain.Name = "pnlMain";
this.pnlMain.Size = new System.Drawing.Size(260, 248);
this.pnlMain.TabIndex = 0;
//
// wbMain
//
this.wbMain.Resize(260, 216);
this.wbMain = Mono.WebBrowser.Manager.GetNewInstance();
The problem lies with your GetNewInstance() from what I understand here. GetNewInstance assumes platform of Windows by default, you need to pass in your own Mono.WebBrowser.Platform for it to render in the framework you want (like Gtk).
Source Code
You can see in the source code I linked, the default GetNewInstance() returns Platform.Winforms;
public static IWebBrowser GetNewInstance ()
{
return Manager.GetNewInstance (Platform.Winforms);
}
Also Mono.WebBrowser has been retired in favor of WebkitSharp. You really should be using WebkitSharp to do this now. WebkitSharp has had...some issues, so there's a currently open version of it called open-webkit-sharp that may work for you as well. The code on there is at least up to date as of 2012. Whereas Mono WebBrowser and webkit-sharp haven't had any major code changes...in years, at least 5 to 7 years.
I've also had good luck with the open version of Awesomium, and it's a staple of the gaming industry. Again, the open version of Awesomium hasn't had any major updates since 2012 though. However, you can get the paid version of Awesomium if money/cost isn't an issue and that has had recent updates.
Related
The issue:
We have an application written in C# that uses UIAutomation to get the current text (either selected or the word behind the carret) in other applications (Word, OpenOffice, Notepad, etc.).
All is working great on Windows 10, even up to 21H2, last update check done today.
But we had several clients informing us that the application is closing abruptly on Windows 11.
After some debugging I've seen some System.AccessViolationException thrown when trying to use the TextPatternRange.GetText() method:
System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.'
What we've tried so far:
Setting uiaccess=true in manifest and signing the app : as mentionned here https://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/350ceab8-436b-4ef1-8512-3fee4b470c0a/problem-with-manifest-and-uiaccess-set-to-true?forum=windowsgeneraldevelopmentissues => no changes (app is in C:\Program Files\
In addition to the above, I did try to set the level to "requireAdministrator" in the manifest, no changes either
As I've seen that it may come from a bug in Windows 11 (https://forum.emclient.com/t/emclient-9-0-1317-0-up-to-9-0-1361-0-password-correction-crashes-the-app/79904), I tried to install the 22H2 Preview release, still no changes.
Reproductible example
In order to be able to isolate the issue (and check it was not something else in our app that was causing the exception) I quickly made the following test (based on : How to get selected text of currently focused window? validated answer)
private void btnRefresh_Click(object sender, RoutedEventArgs e)
{
var p = Process.GetProcessesByName("notepad").FirstOrDefault();
var root = AutomationElement.FromHandle(p.MainWindowHandle);
var documentControl = new
PropertyCondition(AutomationElement.ControlTypeProperty,
ControlType.Document);
var textPatternAvailable = new PropertyCondition(AutomationElement.IsTextPatternAvailableProperty, true);
var findControl = new AndCondition(documentControl, textPatternAvailable);
var targetDocument = root.FindFirst(TreeScope.Descendants, findControl);
var textPattern = targetDocument.GetCurrentPattern(TextPattern.Pattern) as TextPattern;
string text = "";
foreach (var selection in textPattern.GetSelection())
{
text += selection.GetText(255);
Console.WriteLine($"Selection: \"{selection.GetText(255)}\"");
}
lblFocusedProcess.Content = p.ProcessName;
lblSelectedText.Content = text;
}
When pressing a button, this method is called and the results displayed in labels.
The method uses UIAutomation to get the notepad process and extract the selected text.
This works well in Windows 10 with latest update, crashes immediately on Windows 11 with the AccessViolationException.
On Windows 10 it works even without the uiaccess=true setting in the manifest.
Questions/Next steps
Do anyone know/has a clue about what can cause this?
Is Windows 11 way more regarding towards UIAutomation?
On my side I'll probably open an issue by Microsoft.
And one track we might follow is getting an EV and sign the app itself and the installer as it'll also enhance the installation process, removing the big red warnings. But as this is an app distributed for free we had not done it as it was working without it.
I'll also continue testing with the reproductible code and update this question should anything new appear.
I posted the same question on MSDN forums and got this answer:
https://learn.microsoft.com/en-us/answers/questions/915789/uiautomation-throws-accessviolationexception-on-wi.html
Using IUIautomation instead of System.Windows.Automation works on Windows 11.
So I'm marking this as solved but if anyone has another idea or knows what happens you're welcome to comment!
I have an Ionic / Cordova application hosted in the Windows UWP application, and which I am looking into swapping to host within a WPF application (latest .net, eg 6.0), and using WebView2.
Note, the Ionic/Cordova part is not really relevant to this question, this is purely related to WPF.
When running on a Tablet (eg Microsoft surface), I need to resize the app when the soft keyboard is shown, and hidden.
When in UWP, I could hook into the following events in my TypeScript file...
let w = <any>window;
const inputPane = w.Windows.UI.ViewManagement.InputPane.getForCurrentView();
if (!inputPane) {
this.logger.error('WindowsKeyboardService.hookupKeyboardHandlers: could not get inputPane');
return;
}
inputPane.addEventListener('showing', _ => this.onWindowsKeyboardUp);
inputPane.addEventListener('hiding', _ => this.onWindowsKeyboardClose);
So I won't have the WinJS any longer in the WPF, so I will do all the native in the WPF and then call into the JS myself using the appropriate API on the webview.
If I was in UWP, I could do something like the following:
System.Windows.UI.ViewManagement.InputPane.GetForCurrentView().Showing += (s, args) =>
{
GeneralTransform gt = loginButton.TransformToVisual(this);
Point buttonPoint = gt.TransformPoint(new Point(0, loginButton.RenderSize.Height - 1));
var trans = new TranslateTransform { Y = -(buttonPoint.Y - args.OccludedRect.Top) };
loginButton.RenderTransform = trans;
args.EnsuredFocusedElementInView = true;
};
But in WPF, I do not seem to have the `System.Windows.UI namespace:
Is there an equivalent way of doing this within a WPF application?
Update 1
I found this sample code
The whole solution will build in .net framework (4.7), but not in .net 6, as still missing the namespace Windows.UI. Perhaps this is renamed to something?
Update 2
I create a new WinUI project. Calling
var pane = Windows.UI.ViewManagement.InputPane.GetForCurrentView();
gives the same Element Not found error. I call this in a button click event, to give the main app/Window plenty of time to be fully initialized.
Note I am trying this out running from Visual Studio (i.e. Desktop Windows 10), and not on an actual tablet at this stage.
I this similar post where there is a comment
#LeftTwixWand ApplicationView.GetForCurrentView and CoreApplication.GetCurrentView() are only for UWP apps. For WinUI 3 desktop apps, use the Window class for some of the functionality. I'm not completely sure but some of them also now a GetForWindowId method.
It mentions using the Window class, but there is nothing on how to do what I am after here (monitoring the soft keyboard show/hide events).
Update 3
Following #Victor below, I added the code and it asks me to install
#Victor is this correct?
For WPF you just need to use net6.0-windows10.0.17763.0 target framework or newer. APIs will be available for you via existing Interop classes. Do not use System.Runtime.InteropServices.WindowsRuntime, it is .net framework approach.
IntPtr handle = new WindowInteropHelper(window).Handle;
InputPane inputPane = InputPaneInterop.GetForWindow(handle);
Hopefully some of the experienced WPF developers have come across this issue before.
BACKGROUND: This information is probably not necessary to helping fixing the problem, but in case it is relevant.
My solution consists of three projects. A front-end GUI, a business logic service, and a printer service. The three projects have IPC via named pipes. The business logic hands the printing logic a label type and a pallet id.
The Problem: The printing logic then creates the label and prints it (by adding it to the print queue of a printer) As the title suggests this all works fine when I am debugging in visual studio. However when I deploy / install the services on my developer pc it is not working.
Update: It is not throwing an exception but I am only logging "About to send doc to printer" and not the line "Sent doc to printer" So it is hanging on the dw1.Write(fixedDoc); line
More Information: I am using .Net 4.0 in the printing project / visual studio 2013
public void printLabel(string labelType, string _palletID = null)
{
try
{
ILabelTemplate Label = createLabel(labelType, _palletID);
PrintDialog pd = new PrintDialog();
FixedDocument fixedDoc = new FixedDocument();
PageContent pageContent = new PageContent();
FixedPage fixedPage = getFixedPage();
fixedDoc.DocumentPaginator.PageSize = new System.Windows.Size(fixedPage.Width, fixedPage.Height);
IXamlTemplate vm = CreateViewModel(Label);
ILabelPrintDocument template = CreateTemplate(Label);
template.dockPanel.DataContext = vm;
template.dockPanel.Height = fixedPage.Height;
template.dockPanel.Width = fixedPage.Width;
template.dockPanel.UpdateLayout();
fixedPage.Children.Add(template.dockPanel);
((System.Windows.Markup.IAddChild)pageContent).AddChild(fixedPage);
fixedDoc.Pages.Add(pageContent);
XpsDocumentWriter dw1 = PrintQueue.CreateXpsDocumentWriter(new System.Printing.PrintQueue(new System.Printing.PrintServer(), Label.PrinterName));
Library.WriteErrorLog("About to send doc to printer");
dw1.Write(fixedDoc);
Library.WriteErrorLog("Sent doc to printer");
}
catch (Exception ex)
{
Library.WriteErrorLog(ex);
}
SOLVED ... kind of
After several hours of trying different things and reading about this, I found that it was due to my application running as me when I'm debugging but as a LOCAL SYSTEM when I have it deployed. And a local system service does not have access to network resources such as printers. Despite learning this, I then started down the path of how to make a C# service print. Well after seeing many posts (too late in the game to be very helpful)
Like this and also this one I have learned that I was going down the wrong path.
The moral of the story is, if you're reading this post you're probably not at the level of "writing your own printing DLL using the Win32 API (in C/C++ for instance), then use it from your service with P/Invoke"
The solution that did work for me was instead of running this project as a service which was started via my GUI. I have instead turned it into a process which is still started and stopped via my GUI.
The code in question is
if (File.Exists(AppDomain.CurrentDomain.BaseDirectory + "\\yourAppNameGoesHere.exe"))
{
Process.Start(AppDomain.CurrentDomain.BaseDirectory + "\\yourAppNameGoesHere.exe");
}
then when the GUI is closed I run the code
if (File.Exists(AppDomain.CurrentDomain.BaseDirectory + "\\yourAppNameGoesHere.exe"))
{
Process[] myapps = Process.GetProcesses("yourAppNameGoesHere.exe");
foreach (Process _p in myapps)
{
_p.Kill();
}
}
I have C# App using the Mono Framework and GTK UI running on Mac.I have problems regarding the look and feel of the Filechooser dialog.As per gtk https://developer.gnome.org/gtk3/stable/GtkFileChooserDialog.html I should get these icons
But what i get is this one without proper icons in the left hand panel or icons of the drives.For drives there a folder named Volumes and the user needs to open it manually.I think that is not a native Mac user expects.I have posted 2 screenshots obtained from the web.
I have this GTK Version(2.2) Bundled with Mono for Mac.What should i do to get a more native look and feel? Please advice
You can use either the older open-source MonoMac or the newer Xamarin.Mac to open a NSOpenPanel and use the native OS-X file selector instead of the xplat based GTK 2 version.
Mixing MonoMac dialogs on top of GTK# is possible as long as you remember to initialize the application via the MonoMac static method NSApplication.Init(). Do this earlier in the application startup, but after GTK# initializes.
As for opening the native NSOpenPanel, here is an example used within a GTK# Button click handler:
button.Clicked += (object sender, EventArgs e) => {
Application.Invoke (delegate {
var nsOpenPanel = new NSOpenPanel ();
nsOpenPanel.ReleasedWhenClosed = true;
nsOpenPanel.Prompt = "Select file";
var result = nsOpenPanel.RunModal ();
if (result == 1) {
button.Label = nsOpenPanel.Url.ToString ();
}
});
};
Note: It is always wise to wrap the calls within an Application.Invokedelegate so everything is executed on the main GTK UI thread.
I'm trying to develop a BHO for the release preview of IE 10. The BHO needs to be able to allow javascript to call a C# function.
I've followed the instructions available here:
Calling C# BHO methods from Javascript
These instructions work great in IE 9.
Unfortunately, I've found that they only work for the first tab created in IE 10. The second and subsequent tabs do not expose the BHO interface to Javascript. On occasion, new tabs work, but most of the time they do not. Moreover, it fails silently. I'm guessing this has something to do with the process model -- but again, it works fine in IE 9 (which has the same process model).
Here is the specific snippet of code that I'm using:
private void InstallJSObject(IHTMLWindow2 window)
{
// Install our javascript object
IExpando windowEx = (IExpando)window;
PropertyInfo property = windowEx.GetProperty("myBHO", System.Reflection.BindingFlags.IgnoreCase);
if (property == null)
{
property = windowEx.AddProperty("myBHO");
}
property.SetValue(windowEx, this, null);
}
Before posting, I researched the following: http://bit.ly/R9qldf
var myATL = new ActiveXObject("MySampleATL.MyClass");
if (myATL.IsBHOInstalled)
alert (myATL. SayHelloFromBHO());
else
alert ("BHO isn't installed now !");
window.external.AddFavorite(<url>, "text");
Extracted from here.
The the blog is dated back to April'07, still, may be this is what you were looking for..