Question

VisualC++6.0问题CFrameWnd是基类，派生类CMainFrame的参数UINT nFlags,CPoint point传递给基类有什么用

#include <afxwin.h>
class CHelloApp:public CWinApp
{public:virtual BOOL InitInstance(); };

CHelloApp theApp;

class CMainFrame:public CFrameWnd
{public:CMainFrame()

{ Create(NULL,"我的窗口",WS_OVERLAPPEDWINDOW,CRect(0,0,400,300));}
protected:
afx_msg void OnLButtonDown(UINT nFlags,CPoint point);
DECLARE_MESSAGE_MAP()
};

BEGIN_MESSAGE_MAP(CMainFrame,CFrameWnd)
ON_WM_LBUTTONDOWN()
END_MESSAGE_MAP()

void CMainFrame::OnLButtonDown(UINT nFlags,CPoint point)
{MessageBox("你好,我的Visual C++世界！","问候",0);
CFrameWnd::OnLButtonDown(nFlags,point); //CFrameWnd是基类，派生类CMainFrame的参数
//(UINT nFlags,CPoint point)
//传递给基类有什么用
}

BOOL CHelloApp::InitInstance()
{m_pMainWnd=new CMainFrame();
m_pMainWnd->ShowWindow(m_nCmdShow);
m_pMainWnd->UpdateWindow();
return TRUE;}

Answer 1

这是调用基类的方法