请问对个各种消息lParam和wParam的具体内容是什么？

太多了，还是用到具体的消息再看msdn吧。
max返回参数1，参数2中的大者，参数类型可以随便，但参数1，参数2的类型必须一致。min返回小者。

这个问题太不好回答了，因为当初设计这两个参数的时候并没有定死了他的具体含义，你甚至可以自定义它，例如在跟 EDIT 通用空间通信的时候会有另外的含义，如果你以后在自己的程序里使用 SendMessage 来跟自定义的控件通信的话，也许你会有自己重新定义的含义。宏max(参数1，参数2）和min（参数1，参数2）最主要的是看看宏的返回值，参数1，参数2 是随便两个数，宏max(参数1，参数2）返回其中大的那个参数，另外一个正好相反。

这种东西只能查MSDN，因为实在太多了，用到的时候再查嘛

It depends on special message :)

u'd see more details via MSDN

这就说不准了，参数是void类型的，你可以传自定义的类型，然后强制转换过来用。

lParam和wParam是参数的类型，这是MFC的基本数据类型，在 <<深入浅出MFC>>
中有他的解释

对于不同的消息，lParam和wParam有不同的意义，用到时再看吧

这个共用体中全都有:union MessageMapFunctions；
LRESULT lResult = 0; // special case for commands
if (message == WM_COMMAND)
{
if (OnCommand(wParam, lParam))
{
lResult = 1;
goto LReturnTrue;
}
return FALSE;
} // special case for notifies
if (message == WM_NOTIFY)
{
NMHDR* pNMHDR = (NMHDR*)lParam;
if (pNMHDR->hwndFrom != NULL && OnNotify(wParam, lParam, &lResult))
goto LReturnTrue;
return FALSE;
} // special case for activation
if (message == WM_ACTIVATE)
_AfxHandleActivate(this, wParam, CWnd::FromHandle((HWND)lParam)); // special case for set cursor HTERROR
if (message == WM_SETCURSOR &&
_AfxHandleSetCursor(this, (short)LOWORD(lParam), HIWORD(lParam)))
{
lResult = 1;
goto LReturnTrue;
} const AFX_MSGMAP* pMessageMap; pMessageMap = GetMessageMap();
UINT iHash; iHash = (LOWORD((DWORD)pMessageMap) ^ message) & (iHashMax-1);
AfxLockGlobals(CRIT_WINMSGCACHE);
AFX_MSG_CACHE* pMsgCache; pMsgCache = &_afxMsgCache[iHash];
const AFX_MSGMAP_ENTRY* lpEntry;
if (message == pMsgCache->nMsg && pMessageMap == pMsgCache->pMessageMap)
{
// cache hit
lpEntry = pMsgCache->lpEntry;
AfxUnlockGlobals(CRIT_WINMSGCACHE);
if (lpEntry == NULL)
return FALSE; // cache hit, and it needs to be handled
if (message < 0xC000)
goto LDispatch;
else
goto LDispatchRegistered;
}
else
{
// not in cache, look for it
pMsgCache->nMsg = message;
pMsgCache->pMessageMap = pMessageMap;#ifdef _AFXDLL
for (/* pMessageMap already init'ed */; pMessageMap != NULL;
pMessageMap = (*pMessageMap->pfnGetBaseMap)())
#else
for (/* pMessageMap already init'ed */; pMessageMap != NULL;
pMessageMap = pMessageMap->pBaseMap)
#endif
{
// Note: catch not so common but fatal mistake!!
//      BEGIN_MESSAGE_MAP(CMyWnd, CMyWnd)
#ifdef _AFXDLL
ASSERT(pMessageMap != (*pMessageMap->pfnGetBaseMap)());
#else
ASSERT(pMessageMap != pMessageMap->pBaseMap);
#endif if (message < 0xC000)
{
// constant window message
if ((lpEntry = AfxFindMessageEntry(pMessageMap->lpEntries,
message, 0, 0)) != NULL)
{
pMsgCache->lpEntry = lpEntry;
AfxUnlockGlobals(CRIT_WINMSGCACHE);
goto LDispatch;
}
}
else
{
// registered windows message
lpEntry = pMessageMap->lpEntries;
while ((lpEntry = AfxFindMessageEntry(lpEntry, 0xC000, 0, 0)) != NULL)
{
UINT* pnID = (UINT*)(lpEntry->nSig);
ASSERT(*pnID >= 0xC000 || *pnID == 0);
// must be successfully registered
if (*pnID == message)
{
pMsgCache->lpEntry = lpEntry;
AfxUnlockGlobals(CRIT_WINMSGCACHE);
goto LDispatchRegistered;
}
lpEntry++;      // keep looking past this one
}
}
} pMsgCache->lpEntry = NULL;
AfxUnlockGlobals(CRIT_WINMSGCACHE);
return FALSE;
}
ASSERT(FALSE);      // not reachedLDispatch:
ASSERT(message < 0xC000);
union MessageMapFunctions mmf;
mmf.pfn = lpEntry->pfn; // if we've got WM_SETTINGCHANGE / WM_WININICHANGE, we need to
// decide if we're going to call OnWinIniChange() or OnSettingChange() int nSig;
nSig = lpEntry->nSig;
if (lpEntry->nID == WM_SETTINGCHANGE)
{
DWORD dwVersion = GetVersion();
if (LOBYTE(LOWORD(dwVersion)) >= 4)
nSig = AfxSig_vws;
else
nSig = AfxSig_vs;
}

switch (nSig)
{
default:
ASSERT(FALSE);
break; case AfxSig_bD:
lResult = (this->*mmf.pfn_bD)(CDC::FromHandle((HDC)wParam));
break; case AfxSig_bb:     // AfxSig_bb, AfxSig_bw, AfxSig_bh
lResult = (this->*mmf.pfn_bb)((BOOL)wParam);
break; case AfxSig_bWww:   // really AfxSig_bWiw
lResult = (this->*mmf.pfn_bWww)(CWnd::FromHandle((HWND)wParam),
(short)LOWORD(lParam), HIWORD(lParam));
break; case AfxSig_bWCDS:
lResult = (this->*mmf.pfn_bWCDS)(CWnd::FromHandle((HWND)wParam),
(COPYDATASTRUCT*)lParam);
break; case AfxSig_bHELPINFO:
lResult = (this->*mmf.pfn_bHELPINFO)((HELPINFO*)lParam);
break; case AfxSig_hDWw:
{
// special case for OnCtlColor to avoid too many temporary objects
ASSERT(message == WM_CTLCOLOR);
AFX_CTLCOLOR* pCtl = (AFX_CTLCOLOR*)lParam;
CDC dcTemp; dcTemp.m_hDC = pCtl->hDC;
CWnd wndTemp; wndTemp.m_hWnd = pCtl->hWnd;
UINT nCtlType = pCtl->nCtlType;
// if not coming from a permanent window, use stack temporary
CWnd* pWnd = CWnd::FromHandlePermanent(wndTemp.m_hWnd);
if (pWnd == NULL)
{
#ifndef _AFX_NO_OCC_SUPPORT
// determine the site of the OLE control if it is one
COleControlSite* pSite;
if (m_pCtrlCont != NULL && (pSite = (COleControlSite*)
m_pCtrlCont->m_siteMap.GetValueAt(wndTemp.m_hWnd)) != NULL)
{
wndTemp.m_pCtrlSite = pSite;
}
#endif
pWnd = &wndTemp;
}
HBRUSH hbr = (this->*mmf.pfn_hDWw)(&dcTemp, pWnd, nCtlType);
// fast detach of temporary objects
dcTemp.m_hDC = NULL;
wndTemp.m_hWnd = NULL;
lResult = (LRESULT)hbr;
}
break; case AfxSig_hDw:
{
// special case for CtlColor to avoid too many temporary objects
ASSERT(message == WM_REFLECT_BASE+WM_CTLCOLOR);
AFX_CTLCOLOR* pCtl = (AFX_CTLCOLOR*)lParam;
CDC dcTemp; dcTemp.m_hDC = pCtl->hDC;
UINT nCtlType = pCtl->nCtlType;
HBRUSH hbr = (this->*mmf.pfn_hDw)(&dcTemp, nCtlType);
// fast detach of temporary objects
dcTemp.m_hDC = NULL;
lResult = (LRESULT)hbr;
}
break; case AfxSig_iwWw:
lResult = (this->*mmf.pfn_iwWw)(LOWORD(wParam),
CWnd::FromHandle((HWND)lParam), HIWORD(wParam));
break; case AfxSig_iww:
lResult = (this->*mmf.pfn_iww)(LOWORD(wParam), HIWORD(wParam));
break; case AfxSig_iWww:   // really AfxSig_iWiw
lResult = (this->*mmf.pfn_iWww)(CWnd::FromHandle((HWND)wParam),
(short)LOWORD(lParam), HIWORD(lParam));
break; case AfxSig_is:
lResult = (this->*mmf.pfn_is)((LPTSTR)lParam);
break; case AfxSig_lwl:
lResult = (this->*mmf.pfn_lwl)(wParam, lParam);
break; case AfxSig_lwwM:
lResult = (this->*mmf.pfn_lwwM)((UINT)LOWORD(wParam),
(UINT)HIWORD(wParam), (CMenu*)CMenu::FromHandle((HMENU)lParam));
break; case AfxSig_vv:
(this->*mmf.pfn_vv)();
break; case AfxSig_vw: // AfxSig_vb, AfxSig_vh
(this->*mmf.pfn_vw)(wParam);
break; case AfxSig_vww:
(this->*mmf.pfn_vww)((UINT)wParam, (UINT)lParam);
break; case AfxSig_vvii:
(this->*mmf.pfn_vvii)((short)LOWORD(lParam), (short)HIWORD(lParam));
break; case AfxSig_vwww:
(this->*mmf.pfn_vwww)(wParam, LOWORD(lParam), HIWORD(lParam));
break; case AfxSig_vwii:
(this->*mmf.pfn_vwii)(wParam, LOWORD(lParam), HIWORD(lParam));
break; case AfxSig_vwl:
(this->*mmf.pfn_vwl)(wParam, lParam);
break; case AfxSig_vbWW:
(this->*mmf.pfn_vbWW)(m_hWnd == (HWND)lParam,
CWnd::FromHandle((HWND)lParam),
CWnd::FromHandle((HWND)wParam));
break; case AfxSig_vD:
(this->*mmf.pfn_vD)(CDC::FromHandle((HDC)wParam));
break; case AfxSig_vM:
(this->*mmf.pfn_vM)(CMenu::FromHandle((HMENU)wParam));
break; case AfxSig_vMwb:
(this->*mmf.pfn_vMwb)(CMenu::FromHandle((HMENU)wParam),
LOWORD(lParam), (BOOL)HIWORD(lParam));
break; case AfxSig_vW:
(this->*mmf.pfn_vW)(CWnd::FromHandle((HWND)wParam));
break; case AfxSig_vW2:
(this->*mmf.pfn_vW)(CWnd::FromHandle((HWND)lParam));
break; case AfxSig_vWww:
(this->*mmf.pfn_vWww)(CWnd::FromHandle((HWND)wParam), LOWORD(lParam),
HIWORD(lParam));
break; case AfxSig_vWp:
{
CPoint point((DWORD)lParam);
(this->*mmf.pfn_vWp)(CWnd::FromHandle((HWND)wParam), point);
}
break; case AfxSig_vWh:
(this->*mmf.pfn_vWh)(CWnd::FromHandle((HWND)wParam),
(HANDLE)lParam);
break; case AfxSig_vwW:
(this->*mmf.pfn_vwW)(wParam, CWnd::FromHandle((HWND)lParam));
break; case AfxSig_vwWb:
(this->*mmf.pfn_vwWb)((UINT)(LOWORD(wParam)),
CWnd::FromHandle((HWND)lParam), (BOOL)HIWORD(wParam));
break; case AfxSig_vwwW:
case AfxSig_vwwx:
{
// special case for WM_VSCROLL and WM_HSCROLL
ASSERT(message == WM_VSCROLL || message == WM_HSCROLL ||
message == WM_VSCROLL+WM_REFLECT_BASE || message == WM_HSCROLL+WM_REFLECT_BASE);
int nScrollCode = (short)LOWORD(wParam);
int nPos = (short)HIWORD(wParam);
if (lpEntry->nSig == AfxSig_vwwW)
(this->*mmf.pfn_vwwW)(nScrollCode, nPos,
CWnd::FromHandle((HWND)lParam));
else
(this->*mmf.pfn_vwwx)(nScrollCode, nPos);
}
break; case AfxSig_vs:
(this->*mmf.pfn_vs)((LPTSTR)lParam);
break; case AfxSig_vws:
(this->*mmf.pfn_vws)((UINT) wParam, (LPCTSTR)lParam);
break; case AfxSig_vOWNER:
(this->*mmf.pfn_vOWNER)((int)wParam, (LPTSTR)lParam);
lResult = TRUE;
break; case AfxSig_iis:
lResult = (this->*mmf.pfn_iis)((int)wParam, (LPTSTR)lParam);
break; case AfxSig_wp:
{
CPoint point((DWORD)lParam);
lResult = (this->*mmf.pfn_wp)(point);
}
break; case AfxSig_wv: // AfxSig_bv, AfxSig_wv
lResult = (this->*mmf.pfn_wv)();
break; case AfxSig_vCALC:
(this->*mmf.pfn_vCALC)((BOOL)wParam, (NCCALCSIZE_PARAMS*)lParam);
break; case AfxSig_vPOS:
(this->*mmf.pfn_vPOS)((WINDOWPOS*)lParam);
break; case AfxSig_vwwh:
(this->*mmf.pfn_vwwh)(LOWORD(wParam), HIWORD(wParam), (HANDLE)lParam);
break; case AfxSig_vwp:
{
CPoint point((DWORD)lParam);
(this->*mmf.pfn_vwp)(wParam, point);
break;
}
case AfxSig_vwSIZING:
(this->*mmf.pfn_vwl)(wParam, lParam);
lResult = TRUE;
break; case AfxSig_bwsp:
lResult = (this->*mmf.pfn_bwsp)(LOWORD(wParam), (short) HIWORD(wParam),
CPoint(LOWORD(lParam), HIWORD(lParam)));
if (!lResult)
return FALSE;
}

以摘自：BOOL CWnd::OnWndMsg(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult)

调试易

请问对个各种消息lParam和wParam的具体内容是什么？

解决方案 »