C / C++ / MFC

case _HELP_: HtmlHelp(wn, s, HH_DISPLAY_TOC, (DWORD_PTR)NULL);

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CYourApp::CYourApp()
{
  EnableHtmlHelp();
}

BEGIN_MESSAGE_MAP(CYourApp, CWinApp) // or CWinAppEx
  ON_COMMAND(ID_HELP, OnHelp)
END_MESSAGE_MAP()

BOOL CYourApp::InitInstance()
{
...
   CString cszHelpFile(_T("C:\\test.chm"));
   m_pszHelpFilePath = _tcsdup(cszHelpFile);
...
}

#define HLP_INDEX 0 // index of the desired page
void CYourApp::OnHelp()
{
  HtmlHelp(HLP_INDEX, HH_HELP_CONTEXT);
}

#define PROGNAME "myapp"

#define PROGNAME   "myapp"
#define HELPFILE   PROGNAME##".hlp"

const TCHAR *helpFileName = HELPFILE;

PROGNAME".HLP"

class A;

class B
{
  A* m_pA;
  
public:
  B(A* pA) { m_pA = pA; }
  
  bool TestParent() {
    // the implementation must be placed in the cpp-file
    if (m_pA) m_pA->CallMe();
    return (NULL != m_pA);
  }
};

class A
{
  B* m_pB;
  
public:
  A() { m_pB = new B(this); } // A is the "parent" for B
  ~A() { if (m_pB) delete m_pB; }
  void CallMe() {}
};