C / C++ / MFC

#pragma section("SharedSection",read,write,shared)
__declspec(allocate("SharedSection")) int counter = 0;

// Assuming
CHost::GetA() { return &m_A; }
CA::DoSomething { /* body */ }
// then
pHost->GetA()->DoSomething();
// is effectively
pHost->&m_A->DoSomething();
// or 
pHost->m_A.DoSomething();

// Can be also implemented as
CHost::DoSomethingWithA() { m_A.DoSomething(); }
// which is effectively called as
pHost->m_A.DoSomething();

CFirstDialog
{
public:
    // ...
    const CString& GetFileName() const { return m_strFileName; }
protected:
    // ...
    CString m_strFileName;
};

void CFirstDialog::OnEnChangeMfceditbrowse1()
{
    m_browser.GetWindowText(m_strFileName);
}

CSecondDialog
{
public:
    // ...
    void SetFileName(const CString& strFileName) { m_strFileName = strFileName; }
protected:
    // ...
    CString m_strFileName;
};

void CSecondDialog::OnBnClickedOk()
{
    CParentOfDialogs *pParent = static_cast<CParentOfDialogs*>(GetParent());
    // Use pParent here to get the stored name or retrieve it from the first dialog
    CString strFileName = pParent->m_pFirstDialog->GetFileName();
}

Jochen Arndt wrote:

If both dialogs might not exist at the same time you have to store the file name in a member variable of that class (e.g. get the name when DoModal() returns).

void CInputView::OnFirstDlg()
{
	// TODO: Add your command handler code here
	CInputDoc* pDoc = GetDocument();
	CFirstDialog DialogWindow;
        //.....
        CSecondDialog *pDlg = new CSecondDialog(this);
        //...
        pDlg->DoModal();
        delete pDlg;
}

void CMyView::OnSecondDlg()
{
	// TODO: Add your command handler code here
	CMyDoc* pDoc = GetDocument();
	CSecondDialog DialogWindow;
	DialogWindow.DoModal();
	
}

void CInputView::OnFirstDlg()
{
    CFirstDialog DialogWindow;
    DialogWindow.DoModal();
    // Get file name here before DialogWindow goes out of scope
    m_strFileName = DialogWindow.GetFileName();
    // Or (when DialogWindow.m_strFileName is public): 
    //m_strFileName = DialogWindow.m_strFileName
}

CSecondDialog DialogWindow;
// Pass file name before calling DoModal()
DialogWindow.SetFileName(m_strFileName);
DialogWindow.DoModal();

// With class member CSomeDialog *m_pSomeDlg
if (NULL == m_pSomeDlg)
{
    m_pSomeDlg = new CSomeDialog(this);
}