Re: Get pointer to parent of parent (2 levels back) - NEWBIE QUEST

From:

=?Utf-8?B?SmltYm9fSmltYm9iX0ppbWluYXRvcg==?= <JimboJimbobJiminator@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 9 Oct 2008 12:27:01 -0700

Message-ID:

<6F10B26B-D105-409B-A072-21FFC963392E@microsoft.com>

Hey Bogdan,
Thanks for the info. I have a question about this though.

I implemented this and it worked. However, it appears that I can only access
methods and variables from the base class. I cannot get to the public CFile*
in my derived "CTestDlg" class.

Jim

"Bogdan" wrote:

Simply recurse until you get the parent you want.

Example (might not necessary work for you):
CWnd* pwndParent = GetParent();

while (pwndParent->GetStyle() & WS_CHILD) {

pwndParent = pwndParent->GetParent();

}

Bogdan

"Jimbo_Jimbob_Jiminator" <Jimbo_Jimbob_Jiminator@discussions.microsoft.com>
wrote in message news:508CE4E9-27DF-47A0-ABDD-EC9E13F25359@microsoft.com...

My application is dialog-based.
The App creates a dialog. The dialog creates a property sheet. The
property
sheet creates 4 property pages.
The dialog opens a file. I want the property pages to be able to write to
the file. How can I get access back to that file pointer? I found
m_pParentWnd in the Property Page. But, I can't go back like this
m_pParentWnd->m_pParentWnd to get two levels back.

I thought about passing the pointer to the CFile in via the contructors of
the dialog, then to the sheet, then to the pages but I am not sure how to
do
that either.

Any help is greatly appreciated.

Regards
Jimbo_Jimbob_Jiminator
-----------------------
// --- FILE: Test.h
class CMFCTestApp : public CWinApp

// --- FILE: Test.cpp
CMFCTestApp theApp;
CMotmanDlg dlgTest;
m_MainWnd = &dlgTest;
nResponse = dlgTest.DoModal;

-----------------------
// --- FILE: TestDlg.h
class CMFCTestDlg : public CDialog
public
CFile* pDataFile;

// --- FILE: TestDlg.cpp
m_pPSheetTest = new CPSheetTest(m_sWinTitle, (CWnd*)this, 0);
... open("datafile.dat"); // Open the data file at the dialog level

/*--------------------------------------------------------------------
WARNING! EX_CONTROLPARENT MUST be here for tabbed pages to work
correctly!!!!
See WS_EX_CONTROLPARENT.txt file in project directory for more
explanation.
--------------------------------------------------------------------*/
m_pPSheetTest->Create(this, dwStyle, WS_EX_CONTROLPARENT);
m_pPSheetTest->ShowWindow(SW_SHOWNORMAL);

m_bIDOK.EnableWindow(FALSE);
m_bIDOK.ShowWindow(SW_HIDE);

-----------------------
// --- FILE: PSheetTest.h
class CPSheetTest : public CPropertySheet

// --- FILE: PSheetTest.cpp
AddPage(&m_PPage1);
AddPage(&m_PPage2);
AddPage(&m_PPage3);
AddPage(&m_PPage4);
SetActivePage(0);

-----------------------
// --- FILE: PPageTest1.cpp
// --- FILE: PPageTest2.cpp
// --- FILE: PPageTest3.cpp
// --- FILE: PPageTest4.cpp

... Want to access the datafile.dat from all of these pages

-----------------------