C / C++ / MFC

#define WM_AFTER_SHOWING	WM_USER + 769
....
 
BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
	//{{AFX_MSG_MAP(CMyDlg)
	...
	//}}AFX_MSG_MAP
	ON_MESSAGE(WM_AFTER_SHOWING, OnAfterShowing)
END_MESSAGE_MAP()
 
BOOL CMyDlg::OnInitDialog()
{
	CDialog::OnInitDialog();
 
	// Post a message to run the code that does the checks
	PostMessage(WM_AFTER_SHOWING);
 	
	return TRUE;  // return TRUE  unless you set the focus to a control
}
 
LONG CMyDlg::OnAfterShowing(UINT, LONG)  // add this to the header file also
{
	// Put your code here
 
	return 0;
}

BOOL CMyDlg::OnInitDialog()
{	CDialog::OnInitDialog(); 	

	// Post a message to run the code that does the checks	
	AfxBeginThread(Refresh, NULL); 		

	return TRUE;  
} 

UINT CMyDlg::Refresh(LPVOID param)  
{	
	// Put your code here 	
	return 0;
}