I have been using a Webview2 control in a program of mine for a couple of years now. Today, it just started to showing a white screen instead of the web page. The source I was using is https://kenocloud.com/game/Players%20Keno/1/
I changed the source to https://www.google.com and it worked. Then I created a completely new program with one form that has a webview2 control using the https://kenocloud.com/game/Players%20Keno/1 source and it works. So then I deleted the webview2 control and tried to start over again, but when I load the control, all of the old values show in the properties box. So where can I go from here.
Thanks
Related
I'm building a small browser using VB.Net webBrowser control,
I'm testing my apps using any web-sites, when I try to use this web-site and trying to click on any category (Fashion, Pets, Events,...), I realize that nothing happens. I can't figure it out !!!
so, it's not working.
Please can you help?
I built a small wxFrame GUI, originally on Linux using CodeLite+wxCrafter, but on Windows the controls are not visible until I click on a notebook page and back, or resize the form, or hover the mouse over a control. I created a new Windows CodeLite+wxCrafter project and it does not display this issue. I tried comparing all the details between the two projects to see what differences there were, but couldn't find any that fixed the issue. I'm puzzled.
For example, this is what I see when I run the app:
After clicking on the Advanced Page and then back to the Run Page or resizing the form, this is what I see:
Or if I hover my mouse over say a wxButton (Open) it shows up:
This is what it should look like, after I click on the Advanced Page and back to the Run Page or resize the form, and then hover my mouse across all the text controls.
Any ideas what the display issue is?
I am experiencing a very weird behavior while running my Active-X control on “Windows 8” OS, and browser “Microsoft Internet-Explorer 10”.
The control:
My Active-X control is very stable product that my company is already distributing for several years between hundreds of happy customers. The control is an ATL custom-draw control, written in C++, and built with “Visual Studio 2008”.
The problem – the drawing disappears:
While I press the link that opens my control for the first time, I can see that my control is being painted gradually (as my data loading is sometimes slow), but eventually all the drawing disappears, leaving a blank white background color where the controls is located.
Using ‘Spy++’ I can see that my control is really there, but all its painting disappear.
If I move the browser or change its size the control will be re-painted, but otherwise it is simply not visible.
I tried to debug this problem and find out who is erasing my drawing.
I came up with the following technique:
Using WinDBG I added breakpoints at ‘user32.dll’ DLL on the following methods: user32!InvalidateRect, user32!InvalidateRgn, user32!FillRect,
I defined these methods to only show stack and continue with to run,
I ran the above problematic scenario,
When the problem happens I am trying to view who called ‘Invalidate’ or ‘FillRect’,
Since all this happens very quickly I am using the ‘Print Screen’ button to freeze the moment
After doing this several times I find that exactly at the time my control disappears the following stack calls ‘user32!FillRect’:
user32!FillRect
MSHTML!memcpy+0x9805
MSHTML!COmWindowProxy::SwitchMarkup+0x468
MSHTML!CMarkup::SetInteractiveInternal+0x428
MSHTML!CMarkup::RequestReadystateInteractive+0x98
MSHTML!CMarkup::BlockScriptExecutionHelper+0xde
MSHTML!CHtmPost::Exec+0x794
MSHTML!CHtmPost::Run+0x1c
MSHTML!PostManExecute+0x5f
MSHTML!PostManResume+0x7b
MSHTML!CHtmPost::OnDwnChanCallback+0x3a
MSHTML!CDwnChan::OnMethodCall+0x19
MSHTML!GlobalWndOnMethodCall+0x169
MSHTML!GlobalWndProc+0xd7
user32!InternalCallWinProc+0x23
user32!UserCallWinProcCheckWow+0x100
user32!DispatchMessageWorker+0x3ef
user32!DispatchMessageW+0x10
IEFRAME!CTabWindow::_TabWindowThreadProc+0x981
IEFRAME!LCIETab_ThreadProc+0x378
iertutil!CIsoWinMsg::PostQueuedMessagesToComponent+0x4b
IEShims!NS_CreateThread::DesktopIE_ThreadProc+0x66
KERNEL32!BaseThreadInitThunk+0xe
ntdll!__RtlUserThreadStart+0x72
ntdll!_RtlUserThreadStart+0x1b
This is consistent.
When examining this stack I found that this message belongs to a window of class Internet Explorer_Hidden, which is window of size zero (0x0), but with a WS_VISIBLE style. This window belongs to the browser.
Does anyone know this phenomenon?
Is it possible that the browser hidden window is causing this problem?
Could you recommend on other approach to try and hunt the stack that is erasing my drawing?
Many thanks for any hint!
Paz Offer
Conclusion:
The bug was in Microsoft Internet Explorer 10
I used Microsoft Support service to farther investigate this problem. Enclosed here are the findings:
Microsoft Support viewed the version of my IE (Internet Explorer) and suggested to first upgrade IE to its latest patch.
As it happens, the machine I was working on was not setup to be automatically updated by the Windows Update service for some time. As part of upgrading IE I had to first update windows using Windows Update service to its latest patches.
During the process of Windows Update the Microsoft Internet Explorer 10 was automatically updated to its latest patch.
Once IE updated the problem disappeared.
In addition, the ActiveX GUI load process became much faster.
The old version of Microsoft Internet Explorer 10, which caused the problem:
Version: 10.0.9200.16384
Update Versions: RTM (KB2718695)
The new version of Microsoft Internet Explorer 10, which solved the problem:
Version: 10.0.9200.16635
Update Versions: 10.0.7 (KB2846071)
Now all is working as expected.
Thanks, Pazo
Is there a reason / fix for this weird designer issue (at least, I think it's related to the designer), whereby the controls on the form do not appear as they do in the design window when I debug the application..!
Please see the following two screenshots to demonstrate the problem (note: I have blacked out some of the content of the form, this is not the problem):
Picture 1: Showing how the form appears in the designer view
Picture 2: Showing how the form appears in debug mode
You can clearly see that some of the buttons have moved position on the form.
Note: At first glance, this may appear like a duplicate of: Windows Forms Designer destroys form layout. However, I have not installed any additional tools or components. This is simply a standard "vanilla" build of Visual Studio 2012 on Windows 7 32-bit.
I've also come across this question: UI Controls Overlapping & Fonts Issue in Windows Forms Application. However, I am not using "large fonts", nor am I using any non-standard fonts on my controls (all label and button text is left as default). Still, I can see how this would affect the control positions and will do some more checks in this area.
There's nothing happening within the form's Load method.
I'm also using TFS 2012.
What could be causing this? Is there anything I can do to fix it?
EDIT: I've removed the font property for each label and button control, allowing the system to set the default value. Still no change. Interestingly, if I open the form in design mode, then save it, then close it, then open it again, the buttons have moved... If I do this a few times, the buttons migrate until they're off the form.
OK, I've found the answer, after a bit more fiddling. It seems to be related to the Anchor property on the controls. I made a bunch of changes, testing between each change to see if there was any difference. When I selected all the controls and set the Anchor property to Top, Left, this solved the issue.
I hope this helps someone else at some point!
If I use IE I can visit the website I want and click the 'Next' button and life is good. If I open that same website using the webBrowser control and click the 'Next button I get a javascript error message.
I'm not doing anything in the code to manipulate the website. My goal, eventually, is to have some level of automation; but at this point, I get the javascript error and a pop-up and it screws everything else.
I can hide the JS error from popping up; by setting 'WebBrowser1.ScriptErrorsSuppressed = True' but the page isn't working because of the error.
The client script might be assuming a full browser is present and trying to access part of the browser outside the Document Object Model (DOM) of the page. For example, maybe the client script is trying to display something on the browser's status bar, or trying to modify a toolbar which isn't available in the WebBrowserControl. There could be numerous similar reasons.
If you do not have write-access to the web page in question to try fixing it, then play with WebBrowser Control properties such as ScriptErrorsSuppressed and ObjectForScripting
Try setting WebBrowser1 Silent property to true.
Actually, you are receiving this problem because when you run your site in IE8 or IE9 on your normal internet explorer desktop app, you are getting either IE8 or IE( rendering, depending on which you have installed. However, with the webbrowser control, unless you take the effort to change soem settings in the registry, the default rendering engine used by the webbrowser control is IE7 (if u have 7, 8 or 9 installed) and IE4 (if you have 4, 5 or 6 installed).
This is why you are having the problem, if you want help changing the rendering engine version for your webbrowser control, do a google search as there are many examples on SO, and i have provided this answer in some of my previous posts on this tag/topic. feel free to search or ask me.
Let me know how you go.