CAboutDlg::CAboutDlg() :CDialog(CAboutDlg::IDD) { } 不懂这么定义怎么回事,

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CAboutDlg::CAboutDlg() :CDialog(CAboutDlg::IDD) 求指教 CAboutDlg::CAboutDlg() :CDialog(CAboutDlg::IDD) { } 不懂这么定义怎么回事, c++类后面带一个:啥意思 class CAboutDlg :public CDialog//啥意思?{ public:CAboutDlg(); }