Solved

MFC,C++: CEdit inexplicably has a HWND of X00000000

Posted on 2007-11-30
3
635 Views
Last Modified: 2013-12-14
I've created an MFC CDialog, in the usual way. The following ENSURE is causing the application to trigger a breakpoint:

void CWnd::SetWindowText(LPCTSTR lpszString)
{
      ENSURE(this);
      ENSURE(::IsWindow(m_hWnd) || (m_pCtrlSite != NULL));
.....
}

Looking through the call stack, I can see that my CEDit, from which I have called SetWindowTextA(), has a HWND of 0x00000000:

Description = {CEdit hWnd=0x00000000}

This is clearly bogus, but I have no idea why it should be so.

If I don't call any dialog items member functions, the dialog displays without trouble.

I've never had any trouble doing this in the recent past.

MY DoDataExchange is perfect - It was generated by the form editor.

The correct dialog IDD is specified in my enum.

What has gone wrong?

Regards,
Sternocera
0
Comment
Question by:sternocera
  • 2
3 Comments
 
LVL 44

Accepted Solution

by:
AndyAinscow earned 500 total points
ID: 20380637
You haven't linked the edit control to the edit (in the resource).

Check you have the necessary line in the DoDataExchange.
Check you are NOT calling the SetText before the CDialog::OnInitDialog is called
0
 

Author Comment

by:sternocera
ID: 20380645
Andy,

I forgot to call the base class implementation. Embarresingly enough, this is the second time you've answered the same question in a short period.

I'm quite sick at the moment, so I guess I'm not at my peek.

Anyway, Thanks.
0
 
LVL 44

Expert Comment

by:AndyAinscow
ID: 20380680
Thanks, and get well soon.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Introduction: Hints for the grid button.  Nested classes, templated collections.  Squash that darned bug! Continuing from the sixth article about sudoku.   Open the project in visual studio. First we will finish with the SUD_SETVALUE messa…
What my article will show is if you ever had to do processing to a listbox without being able to just select all the items in it. My software Visual Studio 2008 crystal report v11 My issue was I wanted to add crystal report to a form and show…
The viewer will learn how to use and create new code templates in NetBeans IDE 8.0 for Windows.
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.

920 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

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now