方法一:网上常见的
pDlg -> SetWindowPos (& CWnd :: wnd TopMost , 0 , 0 , 0 , 0 , SWP_NOMOVE | SWP_NOSIZE );  或
pDlg-> SetWindowPos ( pDlg ->GetStyle() & WS_EX_TOPMOST , 0 , 0 , 0 , 0 , SWP_NOMOVE | SWP_NOSIZE );
方法二:修改rc文件
IDD_xxx_DIALOG DIALOG 0, 0, 100, 60
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_VISIBLE | WS_CAPTION | WS_SYSMENU
EXSTYLE WS_EX_TOPMOST
CAPTION "xxxx"
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