Disappearing help button...

Ron Forrester -- rjf@infograph.com
Thursday, May 23, 1996


VC++ 4.0/NT 4.0B2/NT 3.51/95/Win32s

I am embedding a dialog box in a CMiniFrameWnd, by called the Create
method of a CDialog derived class.

In the dialog resource, I added a button with an ID of ID_HELP, so that
I could get default help functionality of MFC.

However, MFC or Windows (haven't traced deep enough yet) is removing my
button ID_HELP when I create/display the dialog.

Is it doing this because the dialog is modeless? Can I prevent this
from happening?

If not, and I rename the button ID_MY_HELP, what should I do to fire
the standard help mechanism? I have tried this:


m_pMainFrame->PostMessage(WM_COMMAND,
                          MAKEWPARAM(CToolDlg::IDD,
                                     ID_HELP),
                          (LPARAM)GetSafeHwnd());

with no luck, the message is thrown out...

Any suggestions?
Ron

---

Kanir Pandya -- kpandya@harbinger.net
Thursday, May 30, 1996

[Mini-digest: 3 responses]

MFC has inbuild mechanism to shut of help buttons for the dialog. If 
you look at CDialog code in dlgcore.cpp
	
// enable/disable help button automatically
CWnd* pHelpButton = GetDlgItem(ID_HELP);
if (pHelpButton != NULL)
      pHelpButton->ShowWindow(AfxHelpEnabled() ? SW_SHOW : SW_HIDE);

AfxHelpEnabled checks for if the command is handled by the main frame 
or by application if it is not it disables the button.

You can do following :
CYourDialog::OnInitDialog
{

                 CDialog::OnInitDialog
	CWnd* pWnd = GetDlgItem (ID_HELP);
	if (pWnd)
		pWnd->ShowWindow(TRUE);
	return TRUE;
}

BOOL CSelIndustry::OnHelpInfo(HELPINFO* pHelpInfo) 
{
	AfxGetApp()->WinHelp(IDD);
	return TRUE;
	//return CDialog::OnHelpInfo(pHelpInfo);
}

Kanir Pandya
Sr. Software Engineer
Harbinger Net services
1055, Lenox Park Blvd.
Atlanta, GA-30319
Phone : (404) 841-4324 x3152
-----From: Joerg Redenius 

I knew this problem from my MSVC 1.52. The cause is an invalid m_HWnd. 
Turn on your Debug window and switch your tracing on, you'll get the 
message.

Regards

    Joerg

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+               S T N  A T L A S  E l e k t r o n i k  GmbH               +
+                      Abt. MET2,  Hr. Joerg Redenius                     +
+               Sebaldsbruecker Heerstr. 235,  28305 Bremen               +
+  Tel: +49 (0)421-457-3855   FAX: -4171   e-mail: redenius@cae2.atlas.de +
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 

-----From: "Peter A. Vanvliet" 

The ID_HELP button is tied to the state of the context-sensitive help, or F1
help. So if your class/object that should contain the Help button does not
have a handler for the ID_HELP message, the button is hidden. You can step
through the MFC message routing for ID_HELP.

---------------------------------------------------------------------
Peter A. Vanvliet    Houston, Texas    pvanvlie@neosoft.com 
System Analyst, NanoSoft Corporation (http://www.special-events.com)
HALPC C++ SIG Leader 
WWW home page (http://www.special-events.com/cppsig)

---

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