Library tutorials & articles
Attaching and Detaching Objects
Introduction
MFC provides a set of "wrapper objects" that contain embedded Windows objects. For example, a CWnd wraps an HWND, a CFont wraps an HFONT, a CBrush wraps an HBRUSH, and so on. These are summarized in the table below. There are some significant interactions between the MFC and Windows objects, which you need to understand.
Failure to deal with these issues can lead to problems with spontaneous ASSERT statements, access errors, disappearing objects, and other, more subtle problems.
This essay attempts to elucidate the issues of dealing with the MFC/Windows interface.
| MFC Ojbect | Windows Object | (variant) |
| CWnd | HWND | any window |
| CEdit | HWND | EDIT |
| CListBox | HWND | LISTBOX |
| CStatic | HWND | STATIC |
| CComboBox | HWND | COMBOBOX |
| CGDIObject | (gdi object) | (any) |
| CBitmap | HBITMAP | |
| CBrush | HBRUSH | |
| CPen | HPEN | |
| CFont | HFONT | |
| CRegion | HRGN | |
| CPalette | HPALETTE |
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Sorry posted in wrong thread
Hi
i am new to VC++, while creating a model dialog from a cwnd class i am getting a Assertion error.
can any one tell me where i did wrong.
class CAuthen:: public CWnd
{
............
..
public:
CAuthenDlg authdlg;
..
public :
void checkAuthentication();
};
void CAuthen :: checkAuthentication()
{
..
..
..
if( authdlg.DoModal() == IDOK)
{
...
// some operation goes here
}
..
..
}
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