关于afx void OnNcPaint和afx LRESULT OnNcPaint(UINT, WPARAM, LPARAM..)的问题

Question

MSDN搜索WM_NCPAINT, CWnd下的是void NcPaint的, 还不知道WM_NCPAINT有ON_WM_NCPAINT()/afx viod OnNcPaint()和ON_MESSAGE(WM_NCPAINT, OnNcPaint) / afx LRESULT OnNcPaint(uint, wparam, lparam...)既然有了带参数的WM_NCPAINT,那有LRESULT OnPaint(UINT, WPARAM, LPARAM)吗, 如果有, 什么时候的处理需要用这个.什么时候用ON_WM_NCPAINT(), 什么时候用ON_MESSAGE(WM_NCPAINT) 有个规律吗.

Answer 1

ON_MESSAGE(), ON_WM_NCPAINT() ==》 宏，MFC 都把这些东西封装好了，可以跳进去看一下源码。至于什么时候用，如果不需要用到函数的参数就用 ON_WM_NCPAINT() ==》viod OnNcPaint();
否则用 ON_MESSAGE()==》 LRESULT OnNCPaint(WPARAM, LPARAM);
#define ON_WM_NCPAINT() \
{ WM_NCPAINT, 0, 0, 0, AfxSig_vv, \
(AFX_PMSG)(AFX_PMSGW)(void (AFX_MSG_CALL CWnd::*)(void))&OnNcPaint },//...(void (AFX_MSG_CALL CWnd::*)(void))&OnNcPaint ==> viod OnNcPaint()
#define ON_MESSAGE(message, memberFxn) \
{ message, 0, 0, 0, AfxSig_lwl, \
(AFX_PMSG)(AFX_PMSGW)(LRESULT (AFX_MSG_CALL CWnd::*)(WPARAM, LPARAM))&memberFxn },//... (LRESULT (AFX_MSG_CALL CWnd::*)(WPARAM, LPARAM))&memberFxn  ==> LRESULT OnNCPaint(WPARAM, LPARAM)