Error Creating Window Handle. Vb.net
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up “Error Creating Window Handle” up vote 16 down vote favorite 3 We're working on a very large .NET WinForms composite application - not CAB, but a similar home grown framework. We're running in a Citrix and RDP environment running on Windows Server 2003. We're starting to run into random and difficult to reproduct "Error creating window handle" error that seems to be an old fashion handle leak in our application. We're making heavy use of 3rd Party controls (Janus GridEX, Infralution VirtualTree, and .NET Magic docking) and we do a lot of dynamic loading and rendering of content based on metadata in our database. There's a lot of info on Google about this error, but not a lot of solid guidance about how to avoid issues in this area. Does the stackoverflow community have any good guidance for me for building handle-friendly winforms apps? .net winforms handles share|improve this question edited Feb 27 '13 at 8:15 Kiquenet 5,0672486148 asked Sep 18 '08 at 0:26 user8133 141125 See also [this post of mine about "Error creating window handle"][1] and how it relates to USER Objects and the Desktop Heap. I provide some solutions. [1]: weblogs.asp.net/fmarguerie/archive/2009/08/07/… –Fabrice Aug 8 '09 at 0:41 add a comment| 5 Answers 5 active oldest votes up vote 21 down vote I have tracked down a lot of issues with UIs not unloading as expected in WinForms. Here are some general hints: alot of the time, a control will stay in use because controls events are not properly removed (the tooltip provider caused us really large issues here) or the controls are not properly Disposed. use 'using' blocks around all modal dialogs to ensu
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Winforms issue - Error http://stackoverflow.com/questions/88904/error-creating-window-handle creating window handle [duplicate] up vote 38 down vote favorite 9 This question already has an answer here: “Error Creating Window Handle” 5 answers We are seeing this error in a Winform application. Can anyone help on why you would see this error, and more importantly how to fix it or avoid it from happening. System.ComponentModel.Win32Exception: Error creating window handle. at System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp) at System.Windows.Forms.Control.CreateHandle() http://stackoverflow.com/questions/222649/winforms-issue-error-creating-window-handle at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl() at System.Windows.Forms.Control.OnVisibleChanged(EventArgs e) at System.Windows.Forms.ButtonBase.OnVisibleChanged(EventArgs e) c# windows winforms window-handles share|improve this question edited Jan 30 '11 at 4:02 Yi Jiang 35.6k11105121 asked Oct 21 '08 at 17:01 leora 17.6k2286321114 marked as duplicate by slugster, ecatmur, mattytommo, Anujith, ixe013 Feb 27 '13 at 14:54 This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question. add a comment| 10 Answers 10 active oldest votes up vote 36 down vote accepted Have you run Process Explorer or the Windows Task Manager to look at the GDI Objects, Handles, Threads and USER objects? If not, select those columns to be viewed (Task Manager choose View->Select Columns... Then run your app and take a look at those columns for that app and see if one of those is growing really large. It might be that you've got UI components that you think are cleaned up but haven't been Disposed. Here's a link about this that might be helpful. Good Luck! share|improve this answer answered Oct 21 '08 at 18:06 itsmatt 23.7k879142 I ran into this
on for a client is used actively, users often get "Error creating window handle" exceptions. Aside from the fact http://weblogs.asp.net/fmarguerie/cannot-create-window-handle-desktop-heap that the application consumes too much resources, which is a separate issue http://www.aboutmydot.net/desktop-applications/debugging/unhandled-exception-win32exceptionerror-creating-window-handle.html altogether that we are already addressing, we had difficulties with determining what resources were getting exhausted as well as what the limits are for these resources.We first thought about keeping an eye on the Handles counter in the Windows Task Manager. That was because we error creating noticed that some processes tended to consume more of these resources than they normally should. However, this counter is not the good one because it keeps track of resources such as files, sockets, processes and threads. These resources are named Kernel Objects. The other kinds of resources that we should keep an eye on are the error creating window GDI Objects and the User Objects. You can get an overview of the three categories of resources on MSDN. User Objects Window creation issues are directly related to User Objects. We tried to determine what the limit is in terms of User Objects an application can use.There is a quota of 10,000 user handles per process. This value can be changed in the registry, however this limit was not the real show-stopper in our case. The other limit is 66,536 user handles per Windows session. This limit is theoretical. In practice, you'll notice that it can't be reached. In our case, we were getting the dreaded "Error creating window handle" exception before the total number of User Objects in the current session reached 11,000. Desktop Heap We then discovered which limit was the real culprit: it was the "Desktop Heap".By default, all the graphical applications of an interactive user session execute in what is named a "desktop". The resources allocated to such a desktop are limited (but configurabl
handle Posted by idibiasi in Debugging, Featured on 10 31st, 2006 | no responses ------------------------ Unhandled exception Win32Exception,Error creating window handle.,System.Windows.Forms, at System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp) at System.Windows.Forms.Control.CreateHandle() at System.Windows.Forms.Control.get_Handle() at System.Windows.Forms.Control.CreateGraphicsInternal() at System.Windows.Forms.ThreadExceptionDialog..ctor(Exception t) at System.Windows.Forms.ThreadExceptionDialog..ctor(Exception t) at System.Windows.Forms.ThreadContext.OnThreadException(Exception t) at System.Windows.Forms.Control.WndProcException(Exception e) at System.Windows.Forms.ControlNativeWindow.OnThreadException(Exception e) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) at System.Windows.Forms.ComponentManager. System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager. FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) -------------------------------- This is a very boring error, it means that all the available windows handlers are finished so your application can't create new windows. The limit seems to be 1000 windows but as you can imagine it's really hard to think that someone could write a program that uses 1000 opened windows. The problem is that somewhere in your code you think you have closed forms and released controls but they're just hidden and continue to occupy memory and handlers. I had this problem with a software developed by my company, RYHAB Solutions, and we lost a lot of time to figure out where the problem was. At the end we understood what was going on. We had in our code something like this: public sub CloseWindow() if typeof(me) is mybaseclass then me.visible=false else me.close() end if end sub We used this sub in a base class so all the classes that hinerited by this returned "mybaseclass" when calling typeof(me). This caused all the windows to be hidden instead of c