When I try to open one of my forms in the designer, it says, "Object reference not set to an instance of an object." It does not provide a way to continue, and it does not give me any clue as to what is causing the error.
at Microsoft.VisualStudio.Design.Serialization.CodeDom.MergedCodeDomParser.System.CodeDom.Compiler.ICodeParser.Parse(TextReader stream)
at System.CodeDom.Compiler.CodeDomProvider.Parse(TextReader codeStream)
at Microsoft.VisualStudio.Shell.Design.Serialization.CodeDom.CodeDomDocDataAdapter.get_CompileUnit()
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host)
The code compiles and runs perfectly. Cleaning, rebuilding, closing, reopening haven't worked. All the other forms open fine.
I don't even know what information is relevant. What recourse do I have to debug this?
This will sound silly. The form is apparently a duplicate for a work in progress and the build action was set to None. Setting it to Compile caused the designer to act as normal.
It would be nice if the designer would at least point you in the right direction. Problem solved.
This is because there is' an exception in the event "Load" of the form.
Place the code inside a "try .. catch" block to see the exception
Related
I have a solution whose startup project is an ASP.NET website (the kind without a .vbproj file)
When I'm running in debug mode, the first error I get is a popup
Unhandled exception at line 539, column 51 in script block
0x800a138a - JavaScript runtime error: Function expected
The code "file" is called "script block [dyanmic]" so I think this js is being created by VS or it's a third party code, which means I probably can't fix it. This bold portion of the code below was in yellow when I did a "break". (sorry, I don't know how to highlight a portion of a code block in stack overflow)
function LPCTR(a){var b=0;if("undefined"!=typeof g_isdebug&&g_isdebug||"undefined"!=typeof debug&&debug)init_LPctr(),b=LPctr.increment(a);return 0!==b}
I'm getting several errors similar to this.
How can I ignore these errors?. There is an "exception settings" window in the IDE, and I have "JavaScript Runtime Exceptions" completely unchecked. (My site appears to be working otherwise)
How can I find the "owner" of this code? I don't have a LPCTR function.
If you right click the eror window and at the bottom select to clear javascript errors. They are gone and will not appear next time you compile your project.
Put the code in a try-catchblock
try {
// Your code here
} catch(e) {
// Code run on error, with info var e
}
DukeScript is quite clever in the way it handle changes to the Model so that code is hot-swapped at runtime, see for example here.
One thing it doesn't seem to handle at Runtime though is changes to the HTML layout. Given it runs in a WebView, a kind of a browse, it would nice just to be able to reload the page without having to stop and restart the app.
So, I've tried adding a "reload" button, but I can't find an easy way to do that after the initialization:
BrowserBuilder
.newBrowser()
.loadPage("pages/index.html")
.loadClass(Main.class).
invoke("onPageLoad", args).
showAndWait();
showAndWait() does what it's supposed to do, it doesn't return until the browser is closed. There doesn't seem any way to act on the underlying instance of a WebView and its thread.
Ha ha, simple but effective solution:
Reload
Note: Toni Epple says NetBeans would just detect the change, no reload needed.
I have a main application calling several ViewStack states, each with popup windows. If I don't open any popup windows, I can move between states fine. If I open a popup window then try to change the state using currentState=... I get the error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at spark.components::Scroller/focusInHandler()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\Scroller.as:2139]
at flash.display::Stage/set focus()
at mx.core::UIComponent/setFocus() [E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:9905]
...
I see others having the same problem, for example here:
http://forums.adobe.com/thread/1031531
http://forums.adobe.com/message/2767130
http://forums.adobe.com/message/3448443
http://forums.adobe.com/thread/655749?tstart=-1
http://forums.adobe.com/thread/801149
http://flex4examples.wordpress.com/2011/05/05/skinnabletextbase-focusmanager-runtime-error-popup/
http://bugs.adobe.com/jira/browse/SDK-32036?page=com.atlassian.jira.plugin.system.issuetabpanels%3Aall-tabpanel
But I haven't figured out how to implement the recommended solution. It sounds like I should just include:
import mx.managers.PopUpManager; PopUpManager;
inside my main application and it should work, but it doesn't work for me.
My application has each view state in a different file, each defined using <views:View>. Also, all of the popups are separate files defined as <s:TitleWindow>. Each file includes this line:
import mx.managers.PopUpManager;
I wonder if this means each file is using a different popup manager(?), when it's a singleton and only one should be used for the whole app (how to set that up?).
The code I use to call a popup is:
var _popupName:MyTitleWindowFileName = MyTitleWindowFileName(
PopUpManager.createPopUp(this, MyTitleWindowFileName, true));
_popupName.addEventListener(MyAppController.CLOSE_POPUP,onClosePopUp);
PopUpManager.centerPopUp(_popupName); // call popup
Note that when the main application (the one defined as <s:Application>) runs, the ViewStack states have not been loaded yet (since they get loaded when they are used the first time). Not sure if that has any cause/effect here.
I've tried to follow Adobe's example code in the "Passing data to and from a Spark pop-up window" section here:
http://help.adobe.com/en_US/flex/using/WS6c678f7b363d5da52e8f1ca1124a0430dcf-8000.html#WS6c678f7b363d5da52e8f1ca1124a0430dcf-7ffe
Any ideas much appreciated.
Based on your comments, it seems like the error occurs because the focus remains in the popup. I would expect the PopUpManager and FocusManager classes to handle this better.
One thing I can think of is that the FocusManager may be trying to handle this. But since the state changes, the item that originally had focus (in the view stack child, before the pop up was opened) may no longer be there when the view state changes. Just a hunch, w/out seeing your code.
Here's some things you can do to either work around the problem (or better) further debug it to understand what is happening:
Use FocusManager.setFocus() to move the focus back to an object in the view stack child before closing the pop up
Use FocusManager.getFocus() to debug and see where it thinks the focus is at various stages (before opening popup, before/after changing state, and before/after closing pop up).
It appears this is the situation I'm experiencing:
Adobe Air: scroller throws error when changes focus between different applications
It's an Adobe bug. Solution from Adobe is:
This bug is easily fixed by changing Scroller to do a null pointer check on focusManager before using it.
which is what the first link above attempts to do.
Another link: http://forums.adobe.com/message/3812805
I have a PivotViewer app I am working on, but, I cannot get it to run.
I have a good .cxml file (I used Pauthor to generate the related deep-zoom files). I have tried running it from inside VS 2010 int debug and even built it and tried running it from my localhost. I've checked it in both Firefox and IE. I've made sure it is in a container with set width and height. I've made sure I have the most current silverlight.js, I've set the appropriate MIMEs on IIS.
My XAML:
<UserControl x:Class="DomPivot.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:pivot="clr-namespace:System.Windows.Pivot;assembly=System.Windows.Pivot"
mc:Ignorable="d"
d:DesignHeight="400" d:DesignWidth="400" Loaded="UserControl_Loaded">
<Grid x:Name="LayoutRoot" Background="White" Width="400" Height="400">
<pivot:PivotViewer x:Name="myPivot" Height="350"></pivot:PivotViewer>
</Grid>
</UserControl>
My error:
Error: Unhandled Error in Silverlight Application Set property 'System.Windows.FrameworkElement.Style' threw an exception. [Line: 11 Position: 52]
at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
at DominionPivot.MainPage.InitializeComponent()
at DominionPivot.MainPage..ctor()
at DominionPivot.App.Application_Startup(Object sender, StartupEventArgs e)
at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)
Source File: DomPivotTestPage.aspx
Line: 0
Line 11 Position 52 of the main.xaml is now the equal sign for the Height property of the pivotviewer. Interesting that BEFORE I added the height property, the project threw this error at the equal sign for the x:Name property.
I don't understand why I'm getting this error and would appreciate some help. I've investigated the other topics here but none of those answers either worked or pertained to my situation.
UPDATE:
I've attempted to make sure it isn't some kind of other error cascading into an inability for the control to load by attempting to load a .CXML file from a public source. Same result. I don't think the control itself is loading, so, I can't even debug the code that loads the collection.
Googling "Unhandled Error in Silverlight Application Set property 'System.Windows.FrameworkElement.Style' threw an exception." is no help. It returns 24 hits. Half of those are unrelated. The other half is another person with what appears to be the same problem posting to half-dozen or more forums and getting no answer either.
OK....so here are a number of issues that a lot of frustrating googling and futzing revealed:
Loaded="UserControl_Loaded"
I'm not entirely sure how this parameter ended up in my UserControl tag, but, it is unnecessary and eliminated the error referenced in my question.
I also moved the LoadCollection method out of its own event and into the UserControl_Loaded event and got things to progress.
Next I found that if you are using Visual Studio to run the project, make sure you specify the port number both in your code and in your web project settings. These obviously need to be changed when you post to a live server.
Lastly, I was led to believe that you HAD to use either the freely available Pauthor tools or the Excel plug-in to transform your collection into a Deep Zoom. Which also requires futzing with IIS to allow .dzi and .dzc.
Not so. There is a freely available Microsoft Deep Zoom Composer tool. In that tool you can compose your deep zoom and export the collection. You'll end up with several xml files and image folders. I found that all you have to do is then reference the output_dzc.xml file in your collection.cxml as your ImgBase and make sure your IDs match between the two files. That's all.
I hope this saves someone the frustration I've experienced the last few weeks trying to use this awesome but pathetically under-documented control.
I would also recommend this blog entry:
http://indiandotnet.wordpress.com/2011/02/12/pivot-viewer-example-cricket-world-cup-2011/
It contains a link to a very simple pivotviewer VS 2010 solution file you can use to examine and familiarize yourself with file and directory structure as well as the necessary XML file structure and solution settings.
I'm working on a Flex application that processes and displays small amounts of HTML, sometimes including images. I'm getting the HTML out of third-party RSS feeds. Sometimes, I see this in a pop-up window:
Error #2044: Unhandled IOErrorEvent:. text=Error #2035: URL Not Found.
The RSS URL is just fine, but there's apparently something in the downloaded HTML that's causing a problem. Since the application is meant to run as part of a non-interactive digital sign, anything that requires a click to continue is completely unacceptable. I don't care how useless or malformed a URL is; the app needs to ignore the problem without pestering the user.
Unfortunately, I'm having no luck trapping this event. I'm sprinkling calls like this liberally through the code:
[object].addEventListener(IOErrorEvent.IO_ERROR, handleIOError);
... where [object] is everything from the mx:Text object rendering the HTML to its mx:Canvas parent to the mx:Application top-level app, and handleIOError is a simple function that looks like this:
private function handleIOError(event:IOErrorEvent):void {
trace ("IO error occurred: " + event);
}
But so far, nothing; that bloody error keeps popping up in the Flash player. Does anybody have any insight as to where I'm going wrong?
Make sure you are putting the event on the right object. I haven't done a whole lot of remote loading in Flex, but in Flash, a hilarious and annoying quirk is that when you use the Loader class to load images, the object you need to put event handlers on is NOT the Loader itself, but a property of the loader called contentLoaderInfo.
Read the docs carefully on the objects you are using, a similar pitfall might be at play.
IOErrorEvent is not bubbled so you cant catch or control it if someone else is implementing it.
Please find out which third party component you are using and try to get source if its open source or read some documentation or ask support guys on how to turn off this alert.
For example, if I made RSS component for flex and on error if I displayed the alert, if you use my component, whatever you can do you cant turn off my error alert unless i have provided you a boolean switch to turn it off. So this is really a problem with who has written the code for this alert box. Whatever you do you will not be able to turn this thing off. Except reverse engineer, change the code and recompile it, but it should be legal.