Solved

Error when creating window handle in Winforms MDI App

Posted on 2009-07-13
3
729 Views
Last Modified: 2013-12-17
I have written a Windows Forms MDI Application. In this application the user is allowed to create new windows without any restriction. At some point, after creating several hundreds of windows, the following error occurs:

System.ComponentModel.Win32Exception: Fehler beim Erstellen des Fensterhandles.
   bei System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp)
   bei System.Windows.Forms.Control.CreateHandle()
   bei System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   bei System.Windows.Forms.Control.CreateControl()
   bei System.Windows.Forms.Control.ControlCollection.Add(Control value)

How can I test, if the next window to create can be created successfully or not?
Or how can I test, if the program has reached 90% of the maximum handles, so that I can stop creating new windows early enough to ensure, the rest of the programm will go on working correctly, because if I will stop one window before the maximum the program possibly will need more handles without creating new windows and the error will occur later without creating any new window.
So the best would be to test, if the program has reached x% of the maximum handles. Does someone know how to do this or does someone has any other suggestion to solve my problem?
 
Thanks for any help.
0
Comment
Question by:thbruns
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
3 Comments
 

Author Comment

by:thbruns
ID: 24839380
Perhaps I should add some information here:

A fix mamimum number of windows, the user can create, is no solution, because the application has different types of windows. Some of them have many child controls others only have a few.
0
 

Author Comment

by:thbruns
ID: 24839417
... and I assume the number of available handles differ for some operating systems.

So I need to know how many window handles does my application use at the moment and how many window handles can my application use at maximum.
0
 

Accepted Solution

by:
thbruns earned 0 total points
ID: 24861122
I have found the solution to get the number of user objects and gdi object per process. See:
http://www.syncfusion.com/FAQ/WindowsForms/FAQ_c73c.aspx
(see section 40.8 on that page)

To get the current used handles use the following code:
System.Diagnostics.Process.GetCurrentProcess().Handle
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Help with opening combobox using VB.NET. 3 36
Need syntax help building hyperlink 2 40
How can I do Unit Testing with Session ? 1 23
Problem to Office 1 42
The object model of .Net can be overwhelming at times – so overwhelming that quite trivial tasks often take hours of research. In this case, the task at hand was to populate the datagrid from SQL Server database in Visual Studio 2008 Windows applica…
Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…

756 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question