消息映射值集合
enum AfxSig
{
AfxSig_end = 0, // [marks end of message map]
AfxSig_bD, // BOOL (CDC*)
AfxSig_bb, // BOOL (BOOL)
AfxSig_bWww, // BOOL (CWnd*, UINT, UINT)
AfxSig_hDWw, // HBRUSH (CDC*, CWnd*, UINT)
AfxSig_hDw, // HBRUSH (CDC*, UINT)
AfxSig_iwWw, // int (UINT, CWnd*, UINT)
AfxSig_iww, // int (UINT, UINT)
AfxSig_iWww, // int (CWnd*, UINT, UINT)
AfxSig_is, // int (LPTSTR)
AfxSig_lwl, // LRESULT (WPARAM, LPARAM)
AfxSig_lwwM, // LRESULT (UINT, UINT, CMenu*)
AfxSig_vv, // void (void)
AfxSig_vw, // void (UINT)
AfxSig_vww, // void (UINT, UINT)
AfxSig_vvii, // void (int, int) // wParam is ignored
AfxSig_vwww, // void (UINT, UINT, UINT)
AfxSig_vwii, // void (UINT, int, int)
AfxSig_vwl, // void (UINT, LPARAM)
AfxSig_vbWW, // void (BOOL, CWnd*, CWnd*)
AfxSig_vD, // void (CDC*)
AfxSig_vM, // void (CMenu*)
AfxSig_vMwb, // void (CMenu*, UINT, BOOL)
AfxSig_vW, // void (CWnd*)
AfxSig_vWww, // void (CWnd*, UINT, UINT)
AfxSig_vWp, // void (CWnd*, CPoint)
AfxSig_vWh, // void (CWnd*, HANDLE)
AfxSig_vwW, // void (UINT, CWnd*)
AfxSig_vwWb, // void (UINT, CWnd*, BOOL)
AfxSig_vwwW, // void (UINT, UINT, CWnd*)
AfxSig_vwwx, // void (UINT, UINT)
AfxSig_vs, // void (LPTSTR)
AfxSig_vOWNER, // void (int, LPTSTR), force return TRUE
AfxSig_iis, // int (int, LPTSTR)
AfxSig_wp, // UINT (CPoint)
AfxSig_wv, // UINT (void)
AfxSig_vPOS, // void (WINDOWPOS*)
AfxSig_vCALC, // void (BOOL, NCCALCSIZE_PARAMS*)
AfxSig_vNMHDRpl, // void (NMHDR*, LRESULT*)
AfxSig_bNMHDRpl, // BOOL (NMHDR*, LRESULT*)
AfxSig_vwNMHDRpl, // void (UINT, NMHDR*, LRESULT*)
AfxSig_bwNMHDRpl, // BOOL (UINT, NMHDR*, LRESULT*)
AfxSig_bHELPINFO, // BOOL (HELPINFO*)
AfxSig_vwSIZING, // void (UINT, LPRECT) -- return TRUE
// signatures specific to CCmdTarget
AfxSig_cmdui, // void (CCmdUI*)
AfxSig_cmduiw, // void (CCmdUI*, UINT)
AfxSig_vpv, // void (void*)
AfxSig_bpv, // BOOL (void*)
// Other aliases (based on implementation)
AfxSig_vwwh, // void (UINT, UINT, HANDLE)
AfxSig_vwp, // void (UINT, CPoint)
AfxSig_bw = AfxSig_bb, // BOOL (UINT)
AfxSig_bh = AfxSig_bb, // BOOL (HANDLE)
AfxSig_iw = AfxSig_bb, // int (UINT)
AfxSig_ww = AfxSig_bb, // UINT (UINT)
AfxSig_bv = AfxSig_wv, // BOOL (void)
AfxSig_hv = AfxSig_wv, // HANDLE (void)
AfxSig_vb = AfxSig_vw, // void (BOOL)
AfxSig_vbh = AfxSig_vww, // void (BOOL, HANDLE)
AfxSig_vbw = AfxSig_vww, // void (BOOL, UINT)
AfxSig_vhh = AfxSig_vww, // void (HANDLE, HANDLE)
AfxSig_vh = AfxSig_vw, // void (HANDLE)
AfxSig_viSS = AfxSig_vwl, // void (int, STYLESTRUCT*)
AfxSig_bwl = AfxSig_lwl,
AfxSig_vwMOVING = AfxSig_vwSIZING, // void (UINT, LPRECT) -- return TRUE
AfxSig_vW2, // void (CWnd*) (CWnd* comes from lParam)
AfxSig_bWCDS, // BOOL (CWnd*, COPYDATASTRUCT*)
AfxSig_bwsp, // BOOL (UINT, short, CPoint)
AfxSig_vws,
};
上面的这些值会在CMDTARG.CPP 文件中的_AfxDispatchCmdMsg（）函数中用到
AFX_STATIC BOOL AFXAPI _AfxDispatchCmdMsg(CCmdTarget* pTarget, UINT nID, int nCode,AFX_PMSG pfn, void* pExtra, UINT nSig, AFX_CMDHANDLERINFO* pHandlerInfo)
// return TRUE to stop routing
{
ASSERT_VALID(pTarget);
UNUSED(nCode); // unused in release builds
union MessageMapFunctions mmf;
mmf.pfn = pfn;
BOOL bResult = TRUE; // default is ok
if (pHandlerInfo != NULL)
{
// just fill in the information, don't do it
pHandlerInfo->pTarget = pTarget;
pHandlerInfo->pmf = mmf.pfn;
return TRUE;
}
switch (nSig)
{
case AfxSig_vv:
// normal command or control notification
ASSERT(CN_COMMAND == 0); // CN_COMMAND same as BN_CLICKED
ASSERT(pExtra == NULL);
(pTarget->*mmf.pfn_COMMAND)();
break;
case AfxSig_bv:
// normal command or control notification
ASSERT(CN_COMMAND == 0); // CN_COMMAND same as BN_CLICKED
ASSERT(pExtra == NULL);
bResult = (pTarget->*mmf.pfn_bCOMMAND)();
break;
case AfxSig_vw:
// normal command or control notification in a range
ASSERT(CN_COMMAND == 0); // CN_COMMAND same as BN_CLICKED
ASSERT(pExtra == NULL);
(pTarget->*mmf.pfn_COMMAND_RANGE)(nID);
break;
case AfxSig_bw:
// extended command (passed ID, returns bContinue)
ASSERT(pExtra == NULL);
bResult = (pTarget->*mmf.pfn_COMMAND_EX)(nID);
break;
case AfxSig_vNMHDRpl:
{
AFX_NOTIFY* pNotify = (AFX_NOTIFY*)pExtra;
ASSERT(pNotify != NULL);
ASSERT(pNotify->pResult != NULL);
ASSERT(pNotify->pNMHDR != NULL);
(pTarget->*mmf.pfn_NOTIFY)(pNotify->pNMHDR, pNotify->pResult);
}
break;
case AfxSig_bNMHDRpl:
{
AFX_NOTIFY* pNotify = (AFX_NOTIFY*)pExtra;
ASSERT(pNotify != NULL);
ASSERT(pNotify->pResult != NULL);
ASSERT(pNotify->pNMHDR != NULL);
bResult = (pTarget->*mmf.pfn_bNOTIFY)(pNotify->pNMHDR, pNotify->pResult);
}
break;
case AfxSig_vwNMHDRpl:
{
AFX_NOTIFY* pNotify = (AFX_NOTIFY*)pExtra;
ASSERT(pNotify != NULL);
ASSERT(pNotify->pResult != NULL);
ASSERT(pNotify->pNMHDR != NULL);
(pTarget->*mmf.pfn_NOTIFY_RANGE)(nID, pNotify->pNMHDR,
pNotify->pResult);
}
break;
case AfxSig_bwNMHDRpl:
{
AFX_NOTIFY* pNotify = (AFX_NOTIFY*)pExtra;
ASSERT(pNotify != NULL);
ASSERT(pNotify->pResult != NULL);
ASSERT(pNotify->pNMHDR != NULL);
bResult = (pTarget->*mmf.pfn_NOTIFY_EX)(nID, pNotify->pNMHDR,
pNotify->pResult);
}
break;
case AfxSig_cmdui:
{
// ON_UPDATE_COMMAND_UI or ON_UPDATE_COMMAND_UI_REFLECT case
ASSERT(CN_UPDATE_COMMAND_UI == (UINT)-1);
ASSERT(nCode == CN_UPDATE_COMMAND_UI || nCode == 0xFFFF);
ASSERT(pExtra != NULL);
CCmdUI* pCmdUI = (CCmdUI*)pExtra;
ASSERT(!pCmdUI->m_bContinueRouting); // idle - not set
(pTarget->*mmf.pfn_UPDATE_COMMAND_UI)(pCmdUI);
bResult = !pCmdUI->m_bContinueRouting;
pCmdUI->m_bContinueRouting = FALSE; // go back to idle
}
break;
case AfxSig_cmduiw:
{
// ON_UPDATE_COMMAND_UI case
ASSERT(nCode == CN_UPDATE_COMMAND_UI);
ASSERT(pExtra != NULL);
CCmdUI* pCmdUI = (CCmdUI*)pExtra;
ASSERT(pCmdUI->m_nID == nID); // sanity assert
ASSERT(!pCmdUI->m_bContinueRouting); // idle - not set
(pTarget->*mmf.pfn_UPDATE_COMMAND_UI_RANGE)(pCmdUI, nID);
bResult = !pCmdUI->m_bContinueRouting;
pCmdUI->m_bContinueRouting = FALSE; // go back to idle
}
break;
// general extensibility hooks
case AfxSig_vpv:
(pTarget->*mmf.pfn_OTHER)(pExtra);
break;
case AfxSig_bpv:
bResult = (pTarget->*mmf.pfn_OTHER_EX)(pExtra);
break;
default: // illegal
ASSERT(FALSE);
return 0;
}
return bResult;
}
但是注意：上面的函数中会出现MessageMapFunctions这么一个枚举类型的结构体型结构，一般F12是定位不到他的定义的，其实他是在AFXIMPL.H 文件中定义的
MessageMapFunctions结构体中实际上定义的是一些函数的指针
union MessageMapFunctions
{
AFX_PMSG pfn; // generic member function pointer
// specific type safe variants for WM_COMMAND and WM_NOTIFY messages
void (AFX_MSG_CALL CCmdTarget::*pfn_COMMAND)();
BOOL (AFX_MSG_CALL CCmdTarget::*pfn_bCOMMAND)();
void (AFX_MSG_CALL CCmdTarget::*pfn_COMMAND_RANGE)(UINT);
BOOL (AFX_MSG_CALL CCmdTarget::*pfn_COMMAND_EX)(UINT);
void (AFX_MSG_CALL CCmdTarget::*pfn_UPDATE_COMMAND_UI)(CCmdUI*);
void (AFX_MSG_CALL CCmdTarget::*pfn_UPDATE_COMMAND_UI_RANGE)(CCmdUI*, UINT);
void (AFX_MSG_CALL CCmdTarget::*pfn_OTHER)(void*);
BOOL (AFX_MSG_CALL CCmdTarget::*pfn_OTHER_EX)(void*);
void (AFX_MSG_CALL CCmdTarget::*pfn_NOTIFY)(NMHDR*, LRESULT*);
BOOL (AFX_MSG_CALL CCmdTarget::*pfn_bNOTIFY)(NMHDR*, LRESULT*);
void (AFX_MSG_CALL CCmdTarget::*pfn_NOTIFY_RANGE)(UINT, NMHDR*, LRESULT*);
BOOL (AFX_MSG_CALL CCmdTarget::*pfn_NOTIFY_EX)(UINT, NMHDR*, LRESULT*);
// type safe variant for thread messages
void (AFX_MSG_CALL CWinThread::*pfn_THREAD)(WPARAM, LPARAM);
// specific type safe variants for WM-style messages
BOOL (AFX_MSG_CALL CWnd::*pfn_bD)(CDC*);
BOOL (AFX_MSG_CALL CWnd::*pfn_bb)(BOOL);
BOOL (AFX_MSG_CALL CWnd::*pfn_bWww)(CWnd*, UINT, UINT);
BOOL (AFX_MSG_CALL CWnd::*pfn_bHELPINFO)(HELPINFO*);
BOOL (AFX_MSG_CALL CWnd::*pfn_bWCDS)(CWnd*, COPYDATASTRUCT*);
HBRUSH (AFX_MSG_CALL CWnd::*pfn_hDWw)(CDC*, CWnd*, UINT);
HBRUSH (AFX_MSG_CALL CWnd::*pfn_hDw)(CDC*, UINT);
int (AFX_MSG_CALL CWnd::*pfn_iwWw)(UINT, CWnd*, UINT);
int (AFX_MSG_CALL CWnd::*pfn_iww)(UINT, UINT);
int (AFX_MSG_CALL CWnd::*pfn_iWww)(CWnd*, UINT, UINT);
int (AFX_MSG_CALL CWnd::*pfn_is)(LPTSTR);
LRESULT (AFX_MSG_CALL CWnd::*pfn_lwl)(WPARAM, LPARAM);
LRESULT (AFX_MSG_CALL CWnd::*pfn_lwwM)(UINT, UINT, CMenu*);
void (AFX_MSG_CALL CWnd::*pfn_vv)(void);
void (AFX_MSG_CALL CWnd::*pfn_vw)(UINT);
void (AFX_MSG_CALL CWnd::*pfn_vww)(UINT, UINT);
void (AFX_MSG_CALL CWnd::*pfn_vvii)(int, int);
void (AFX_MSG_CALL CWnd::*pfn_vwww)(UINT, UINT, UINT);
void (AFX_MSG_CALL CWnd::*pfn_vwii)(UINT, int, int);
void (AFX_MSG_CALL CWnd::*pfn_vwl)(WPARAM, LPARAM);
void (AFX_MSG_CALL CWnd::*pfn_vbWW)(BOOL, CWnd*, CWnd*);
void (AFX_MSG_CALL CWnd::*pfn_vD)(CDC*);
void (AFX_MSG_CALL CWnd::*pfn_vM)(CMenu*);
void (AFX_MSG_CALL CWnd::*pfn_vMwb)(CMenu*, UINT, BOOL);
void (AFX_MSG_CALL CWnd::*pfn_vW)(CWnd*);
void (AFX_MSG_CALL CWnd::*pfn_vWww)(CWnd*, UINT, UINT);
void (AFX_MSG_CALL CWnd::*pfn_vWp)(CWnd*, CPoint);
void (AFX_MSG_CALL CWnd::*pfn_vWh)(CWnd*, HANDLE);
void (AFX_MSG_CALL CWnd::*pfn_vwW)(UINT, CWnd*);
void (AFX_MSG_CALL CWnd::*pfn_vwWb)(UINT, CWnd*, BOOL);
void (AFX_MSG_CALL CWnd::*pfn_vwwW)(UINT, UINT, CWnd*);
void (AFX_MSG_CALL CWnd::*pfn_vwwx)(UINT, UINT);
void (AFX_MSG_CALL CWnd::*pfn_vs)(LPTSTR);
void (AFX_MSG_CALL CWnd::*pfn_vOWNER)(int, LPTSTR); // force return TRUE
int (AFX_MSG_CALL CWnd::*pfn_iis)(int, LPTSTR);
UINT (AFX_MSG_CALL CWnd::*pfn_wp)(CPoint);
UINT (AFX_MSG_CALL CWnd::*pfn_wv)(void);
void (AFX_MSG_CALL CWnd::*pfn_vPOS)(WINDOWPOS*);
void (AFX_MSG_CALL CWnd::*pfn_vCALC)(BOOL, NCCALCSIZE_PARAMS*);
void (AFX_MSG_CALL CWnd::*pfn_vwp)(UINT, CPoint);
void (AFX_MSG_CALL CWnd::*pfn_vwwh)(UINT, UINT, HANDLE);
BOOL (AFX_MSG_CALL CWnd::*pfn_bwsp)(UINT, short, CPoint);
void (AFX_MSG_CALL CWnd::*pfn_vws)(UINT, LPCTSTR);
};
其中AFX_PMSG这个结构的定义是在AFXWIN.H 文件中定义的
typedef void (AFX_MSG_CALL CCmdTarget::*AFX_PMSG)(void);
通过以上的这些数据和函数MFC把其内部凌乱的流程函数全部都进行了整理、汇总；但是请注意：_AfxDispatchCmdMsg虽然是一个MFC的全局函数但是MessageMapFunctions结构中的函数指针所指向的大多数都是CCmdTarget类中的函数，可见CCmdTarget类对前期流程控制的重要性