Error Creating Window Handle Wndproc
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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” after define overridden WndProc method up vote 0 down vote favorite I created a system.componentmodel.win32exception error creating window handle simple WinForms project, didn't do absolutely anything, just added this code in Form1.cs: protected override void WndProc(ref Message m) { } And that's it. It compiles, but throw an exception "Error creating window handle". Like on the screen: http://oi62.tinypic.com/ivgww5.jpg Another thing is I have a project created couple of days before, that use WndProc without any exceptions. Can anybody explain me what could be the problem here? Thanks for help, btw. Stack trace: at System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp) at System.Windows.Forms.Control.CreateHandle() at System.Windows.Forms.Form.CreateHandle() at System.Windows.Forms.Control.get_Handle() at System.Windows.Forms.Control.SetVisibleCore(Boolean value) at System.Windows.Forms.Form.SetVisibleCore(Boolean value) at System.Windows.Forms.Control.set_Visible(Boolean value) at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) at WindowsFormsApplication1.Program.Main() in C:\Users\Johny\Documents\Visual Studio 2010\Projects\Temp\WindowsFormsApplication1\WindowsFormsApplication1\Program.cs:line 18 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, O
not set to an winforms error creating window handle instance of an object.) Visual Studio Languages , .NET Framework > Visual C# Question 2 Sign in to vote I have a MDI application. In the main http://stackoverflow.com/questions/25389897/error-creating-window-handle-after-define-overridden-wndproc-method form I open two childs. I maximize them and when I try to open another child I get the error:Error creating window handle. at System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp) at System.Windows.Forms.Control.CreateHandle() at System.Windows.Forms.Form.CreateHandle() at System.Windows.Forms.Control.get_Handle() at https://social.msdn.microsoft.com/Forums/vstudio/en-US/e5d0721e-166a-426f-adff-ef00c2f541e0/error-creating-window-handle-innerexception-object-reference-not-set-to-an-instance-of-an-object?forum=csharpgeneral System.Windows.Forms.Form.SetVisibleCore(Boolean value) at System.Windows.Forms.Control.Show() at Creon.DRAGON.MainForm.mIUserManagement_Click(Object sender, EventArgs e) at System.Windows.Forms.MenuItem.OnClick(EventArgs e) at System.Windows.Forms.MenuItem.MenuItemData.Execute() at System.Windows.Forms.Command.Invoke() at System.Windows.Forms.Command.DispatchID(Int32 id) at System.Windows.Forms.Control.WmCommand(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.ContainerControl.WndProc(Message& m) at System.Windows.Forms.Form.WndProc(Message& m) at Creon.Common.BasicWinControls.CreonForm.WndProc(Message& m) at Creon.DRAGON.MainForm.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) InnerExceptionObject reference not set to an instance of an object. at System.Windows.Forms.NativeWindow.WindowClass.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.IntCreateWindowEx(Int32 dwExStyle, String lpszClassName, String lpszWindowName, Int32 style, Int32 x, Int32 y, Int32 width, Int32 height, HandleRef hWndParent, HandleRef hMenu, HandleRef hInst, Object
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a Question Need help? Post your question and get tips & solutions from a community of 418,509 IT Pros & Developers. It's quick & easy. Getting "Error creating window handle." and don't know why P: n/a Flack Hey guys, Here is whats happening. I have a StringBuilder, a TextBox, and a TabControl with one TabPage. On my main form, I created and displayed a fairly big maze. While the app is solving the maze, it appends each step it takes to the StringBuilder. When the maze is solved, the user can click a menu item to display the results. When the menu item is clicked, I set the TextBox Text value using the StringBuilder's ToString() method and the TabControl, which starts with Visible = false is displayed by setting Visible= true. That is the line that causes this error: _results.Visible = true; // _results is the TabControl A first chance exception of type 'System.ComponentModel.Win32Exception' occurred in system.windows.forms.dll Additional information: Error creating window handle. Now, I'm not sure what is causing this error. The TextBox is the only control on the single existing TabPage and is set to Fill the page. Can it be that there are too many lines in the TextBox? After solving the maze, there are 18362 lines of text to be displayed. Is that a problem because everyhting works fine when I am dealing with smaller mazes and fewer lines of text. Any help is greatly appreciated :) P.S. The strange thing is that rarely it works fine even with a huge amount of text. Following is the call stack: system.windows.forms.dll!System.Windows.Forms.Nati veWindow::CreateHandle(System.Windows.Forms.Create Params cp = {System.Windows.Forms.CreateParams}) + 0x264 bytes system.windows.forms.dll!System.Windows.Forms.Cont rol::CreateHandle() + 0x19a bytes system.windows.forms.dll!System.Windows.Forms.Text BoxBase::CreateHandle() + 0x30 bytes system.windows.forms.dll!System.Windows.Forms.Cont rol::CreateControl(bool fIgnoreVisible = false) + 0xd4 bytes system.windows.forms.dll!System.Windows.Forms.Cont rol::CreateCo