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copied!<p>Yes, it is memory leak in your case but you can avoid memory leak in cases where modeless dialog allocated on the heap by making use of overriding <code>PostNcDestroy</code>.</p> <p>Dialogs are not designed for auto-cleanup ( where as Main frame windows, View windows are). In case you want to provide the auto-cleanup for dialogs then you must override the <code>PostNcDestroy</code> member function in your derived class. To add auto-cleanup to your class, call your base class and then do a <code>delete this</code>. To remove auto-cleanup from your class, call <code>CWnd::PostNcDestroy</code> directly instead of the <code>PostNcDestroy</code> member in your direct base class.</p> <pre><code>void MyDialog::PostNcDestroy() { CDialog::PostNcDestroy(); delete this; } </code></pre> <p>How this works (from MSDN):</p> <blockquote> <p>When destroying a Windows window, the last Windows message sent to the window is WM_NCDESTROY. The default CWnd handler for that message (CWnd::OnNcDestroy) will detach the HWND from the C++ object and call the virtual function PostNcDestroy. Some classes override this function to delete the C++ object.</p> <p>"delete this" will free any C++ memory associated with the C++ object. Even though the default CWnd destructor calls DestroyWindow if m_hWnd is non-NULL, this does not lead to infinite recursion since the handle will be detached and NULL during the cleanup phase.</p> </blockquote> <p>You can also refer MSDN (<a href="http://msdn.microsoft.com/en-us/library/5zba4hah(VS.80).aspx" rel="noreferrer">Destroying Window Objects</a> ) for further details.</p> <p><strong>Note:</strong></p> <p>This works for modeless dialog that can be allocated on the <strong>heap</strong>.</p>

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