asked on

How to get to protected member m_nIDHelp

There is a protected member variable m_nIDHelp. I am
not sure if it is a member of the CWnd class or the
CDialog class. It shows up as a "protected" member
of my CDialog object in the debugger.

Anyway, the question is, is there an access function
available so that I can get to this from outside the
class? Or am I going to have to subclass from CDialog
and provide my own access function?

By the way, what do I do when an expert answers a
question that is not sufficient? My question is tagged
as answered and waiting for a grade so no one looks
at it. The expert said to get back to him if it was
not sufficient, but the only way I have to do this is
by posting a comment and I have had no response for
quite a while. The first response was virtually
immediate, but now it sits.

ASKER CERTIFIED SOLUTION

MarkusLoibl

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solomon021499

ASKER

Thank you for resonding. I did see the definition of CDialog in afxwin.h and the void SetHelpID(UNIT nIDR) function. However, I need to be able to retrieve the value, not set it.

I assume this means that I will have to provide this myself.

Also, thank you for your advice about question status.

MarkusLoibl

you also find in the MFC-sources:

ON_MESSAGE(WM_HELPHITTEST, OnHelpHitTest)
LRESULT CDialog::OnHelpHitTest(WPARAM, LPARAM)
{
if (m_nIDHelp != 0)
return HID_BASE_RESOURCE + m_nIDHelp;
return 0;
}

I think you can use this member to retrieve your actual m_nIDHelp with:
UINT helpId = myDialog->SendMessage(WM_HELPHITTEST);
if( helpId ) helpId -= HID_BASE_RESOURCE;
This should work!

solomon021499

ASKER

I tried it and have not yet been able to get it to work.
It is necessary to include afxpriv.h, but I get many compilation errors in it when I do so. I assume that it requires yet another header, but I have not yet found it. Thank you. I will let you know when I get it.

solomon021499

ASKER

As I indicated in my last comment, I have not been able to get
UINT helpId = myDialog->SendMessage(WM_HELPHITTEST);
if( helpId ) helpId -= HID_BASE_RESOURCE;
to work when including afxpriv.h. I do not know how to elimination the multitude of compilation errors that occur when including that file. I tried defining WM_HELPHITTEST and HID_BASE_RESOURCE myself to the value in afxpriv.h
#define WM_HELPHITTEST 0x0366
#define HID_BASE_RESOURCE 0x00020000UL
which did work. However, this is a embarassing work around. Do you have any ideas, what the problem is. Do I need to include yet another file?

MarkusLoibl

I use VC++ 5.0 and do not have any problems with it.
I just built up a little example, and I can send you the files with e-mail, if you tell me your email-adress
(send it to: MarkusLoibl@ThinkTools.com )

MarkusLoibl