EnumChildWindows Function

EnumChildWindows Function

The EnumChildWindows function enumerates the child windows that belong to the specified parent window by passing the handle to each child window, in turn, to an application-defined callback function. EnumChildWindows

主框架调用EnumChildWindows让每个子窗口都去执行SendPrepareToClose去做每个子窗口的清理工作。

BOOL CMainFrame::DestroyWindow(){ ::EnumChildWindows(m_hWnd, SendPrepareToClose, 0); return CMDIFrameWnd::DestroyWindow();} static BOOL CALLBACK SendPrepareToClose(HWND hWnd, LPARAM){ CWnd* pWnd = CWnd::FromHandlePermanent(hWnd); if (pWnd != NULL) { pWnd->SendMessage(WM_USER_PREPARE_TO_CLOSE); if (pWnd->GetWindow(GW_CHILD) != NULL) ::EnumChildWindows(pWnd->m_hWnd, SendPrepareToClose, 0); } return TRUE;}

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