How to get the owner hwnd of a dialogbox

[Tam]

INT_PTR DialogBox(          HINSTANCE hInstance,
    LPCTSTR lpTemplate,
    HWND hWndParent,
    DLGPROC lpDialogFunc
);

a process call DialogBox("xxx", hwndParent, DlgProc), and soon a dialogbox popup(It's hwnd is hwndChild)
Now, I know hwndChild, how can I get hwndParent?
Thank you.

[hutch--]

Try the simple API GeParent() for the parent handle.

[Tedd]

If you're the one creating the dialog box, then the hWndParent parameter will be the handle of your main application window.