EndDialog fails with GetlastError code 1420

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I have written a program, it can run on Windows SP2 and SP3, but today it can not work correctly on one colleague's computer. I have tried other person's computer, where it always work well. So I use MessageBox to debug the program. When I use EndDialog to close a modal dialog, it failed and GetLastError code is:

1420, ERROR_NOT_WINDOW_DIALOG.

I don't know why. I also use SendMessage to replay EndDialog to close the dialog. But I can't see WM_CLOSE in Spy++. When I use ALT+F4 close the dialog, then SendMessage can work well. I was very confusing!

C++

CWnd* pWnd = FindWindow(NULL, _T("Progress"));

if (pWnd != NULL)
{
  BOOL bResult = ::EndDialog(pWnd->m_hWnd, IDOK);

  if (bResult)
  {
     MessageBox(_T("OK"));
  }
  else
  {
    CString strMsg;
    strMsg.Format(_T("NOT OK %d"), GetLastError());
    MessageBox(strMsg);
  }
}

Posted 17-Jun-10 5:17am

zwhate

Updated 17-Jun-10 10:06am

Moak

v3

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Jayant Dash · Answer 1 · 2010-06-19T12:14:00

Solution 2

yeah u must call EndDialog in side the window procedure. Or else you can post a message to window procedure to exit your dialog

Other wise you can use SendMessage to exit the window

C#

public const int WM_COMMAND = 0x0112;
public const int WM_CLOSE = 0xF060;

SendMessage(pWnd, WM_COMMAND, WM_CLOSE, 0);

Posted 19-Jun-10 12:14pm

Jayant Dash

Comments

zwhate 20-Jun-10 9:55am

I know what you said, but what is confusing me is that when I changed the dialog's title name it was OK.

I think it maybe another window's titil name is same to my dialog's, but I have not find it...

Richard MacCutchan · Answer 2 · 2010-06-17T05:30:00

Solution 1

You should only call EndDialog() from within your dialog's message handler. See the remarks on this page[^].

Posted 17-Jun-10 5:30am

Richard MacCutchan

Comments

zwhate 17-Jun-10 21:12pm

Yeah, it was a dialog which was created by follow code:

CprogressDlg progressDlg;
progressDlg.DoMal();