ActiveX控件窗口的产生---源码分析

<span style="font-family: Arial, Helvetica, sans-serif;">控件窗口的建立过程（只取了函数中的关键代码）：</span>

STDMETHODIMP COleControl::XOleObject::DoVerb(LONG iVerb, LPMSG lpmsg,
LPOLECLIENTSITE pActiveSite, LONG lindex, HWND hwndParent,
LPCRECT lprcPosRect)
{
//OLEIVERB_INPLACEACTIVATE:
pThis->OnActivateInPlace((iVerb != OLEIVERB_INPLACEACTIVATE), lpmsg);
}
HRESULT COleControl::OnActivateInPlace(BOOL bUIActivate, LPMSG pMsg)
{
m_bInPlaceSiteEx = FALSE;
m_pInPlaceSite->OnInPlaceActivate();  //告诉容器要进行原地激活
m_pInPlaceSite->GetWindow(&hwndParent)；	//获得容器窗口
m_pInPlaceSite->GetWindowContext(&m_pInPlaceFrame, &m_pInPlaceDoc,&m_rcPos, &rcClip, &m_frameInfo)；//获取容器实现IOleInPlaceFrame接口的对象

m_bInPlaceActive = CreateControlWindow(hwndParent, m_rcPos,rectClip);  //（1）以容器窗口为父窗口，创建控件窗口
SendAdvise(OBJECTCODE_SHOWOBJECT); 	//（2）
}
（1）：
BOOL COleControl::CreateControlWindow(HWND hWndParent, const CRect& rcPos,LPCRECT prcClip)
{
dwStyle = WS_VISIBLE|WS_CHILD|WS_CLIPSIBLINGS|WS_CLIPCHILDREN;
dwExStyle = WS_EX_NOPARENTNOTIFY;

if ((!IsSubclassedControl() || m_bMsgReflect) && m_bAutoClip)

{ AfxDeferRegisterClass(AFX_WNDOLECONTROL_REG); //注册窗口类，见注
CreateEx(dwExStyle, AFX_WNDOLECONTROL, m_strText, dwStyle,rcPos.left, rcPos.top, rcPos.Width(), rcPos.Height(),hWndParent, 0); //（1.1）

}

else

{

if (m_pReflect == NULL)

	{

m_pReflect = new CReflectorWnd;

m_pReflect->Create(prcClip, hWndParent);  //创建反射通知消息的窗口

	}

	else if (m_pReflect->m_hWnd != NULL)	//如果该窗口已经存在，则为其指定父窗口
{
::SetParent(m_pReflect->m_hWnd, hWndParent);
::SetWindowPos(m_pReflect->m_hWnd, NULL, 0, 0, 0, 0,
SWP_NOZORDER|SWP_NOMOVE|SWP_NOSIZE|SWP_NOACTIVATE|
SWP_SHOWWINDOW);
}

if (m_pReflect != NULL && m_pReflect->m_hWnd != NULL)	//成功创建反射窗口后
{
CreateEx(dwExStyle, NULL, m_strText, dwStyle,
m_ptOffset.x, m_ptOffset.y, rcPos.Width(), rcPos.Height(),
m_pReflect->m_hWnd, 0);		//创建控件窗口
}

}
OnFontChanged(); 	// 设置新窗口字体（1.2）
}
（1.1）：
BOOL CWnd::CreateEx(DWORD dwExStyle, LPCTSTR lpszClassName,
LPCTSTR lpszWindowName, DWORD dwStyle,
int x, int y, int nWidth, int nHeight,
HWND hWndParent, HMENU nIDorHMenu, LPVOID lpParam)
{
PreCreateWindow(cs)；	//（1.1.1）
AfxHookWindowCreate(this);	//（1.1.2）
HWND hWnd = ::AfxCtxCreateWindowEx(cs.dwExStyle, cs.lpszClass,
cs.lpszName, cs.style, cs.x, cs.y, cs.cx, cs.cy,
cs.hwndParent, cs.hMenu, cs.hInstance, cs.lpCreateParams);
}
（1.1.1）：
BOOL CWnd::PreCreateWindow(CREATESTRUCT& cs)
{
// AfxDeferRegisterClass(AFX_WND_REG)；
return TURE;
}
（1.1.2）：
void AFXAPI AfxHookWindowCreate(CWnd* pWnd)
{
pThreadState->m_hHookOldCbtFilter = ::SetWindowsHookEx(WH_CBT, _AfxCbtFilterHook, NULL, ::GetCurrentThreadId());	//设置窗口钩子
}
LRESULT CALLBACK  _AfxCbtFilterHook(int code, WPARAM wParam, LPARAM lParam)
{
ASSERT(code == HCBT_CREATEWND);
CWnd* pWndInit = pThreadState->m_pWndInit;	//值为 {CTZWpsSignCtrl hWnd=0x00000000}
HWND hWnd = (HWND)wParam;
pWndInit->Attach(hWnd);
WNDPROC *pOldWndProc = pWndInit->GetSuperWndProcAddr();	//返回 &m_pfnSuper;
WNDPROC afxWndProc = AfxGetAfxWndProc();
oldWndProc = (WNDPROC)SetWindowLongPtr(hWnd, GWLP_WNDPROC, (DWORD_PTR)afxWndProc);	//再次设置窗口钩子
if (oldWndProc != afxWndProc)
*pOldWndProc = oldWndProc;
::UnhookWindowsHookEx(pThreadState->m_hHookOldCbtFilter);
}
WNDPROC AFXAPI AfxGetAfxWndProc()
{
return &AfxWndProc;
}
LRESULT CALLBACK AfxWndProc(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam)
{
CWnd* pWnd = CWnd::FromHandlePermanent(hWnd);
if (pWnd == NULL || pWnd->m_hWnd != hWnd)
return ::DefWindowProc(hWnd, nMsg, wParam, lParam);
return AfxCallWndProc(pWnd, hWnd, nMsg, wParam, lParam);
}
LRESULT AFXAPI AfxCallWndProc(CWnd* pWnd, HWND hWnd, UINT nMsg, WPARAM wParam = 0, LPARAM lParam = 0)
{
if ((nMsg == WM_DESTROY) && (pWnd->m_pCtrlCont != NULL))
pWnd->m_pCtrlCont->OnUIActivate(NULL);
dwStyle=0；
if (nMsg == WM_INITDIALOG)
_AfxPreInitDialog(pWnd, &rectOld, &dwStyle);
lResult = pWnd->WindowProc(nMsg, wParam, lParam);	//该函数中负责处理映射表中的消息
if (nMsg == WM_INITDIALOG)
_AfxPostInitDialog(pWnd, rectOld, dwStyle);
return lResult;
}
（1.2）：
void COleControl::OnFontChanged()
{
InvalidateControl();
}
void COleControl::InvalidateControl(LPCRECT lpRect, BOOL bErase)
{
SendAdvise(OBJECTCODE_VIEWCHANGED);	（1.2.1）
SendAdvise(OBJECTCODE_DATACHANGED);   	（1.2.2）
}
（1.2.1）：
void COleControl::SendAdvise(UINT uCode)
{
//COleControl类内嵌的实现IViewObjectEx接口的对象
m_xViewObject.GetAdvise(&aspects, &advf, &pAdvSink);
pAdvSink->OnViewChange(DVASPECT_CONTENT, -1);
}
STDMETHODIMP COleControl::XViewObject::GetAdvise(DWORD* pAspects, DWORD* pAdvf,
LPADVISESINK* ppAdvSink)
{
_AFXCTL_ADVISE_INFO* pAdviseInfo = pThis->m_pAdviseInfo;
*pAspects = pAdviseInfo->m_dwAspects;   	 //DWORD类型
*pAdvf = pAdviseInfo->m_dwAdvf;		//DWORD类型
*ppAdvSink = pAdviseInfo->m_pAdvSink;	//IAdviseSink*类型

}
（1.2.2）：
void COleControl::SendAdvise(UINT uCode)
{
//m_pDataAdviseHolder为IDataAdviseHolder * 类型
m_pDataAdviseHolder->SendOnDataChange(&m_xDataObject, 0, 0);
}
（2）：
void COleControl::SendAdvise(UINT uCode)
{
m_pClientSite->ShowObject();
}
注：
#define AfxDeferRegisterClass(fClass) AfxEndDeferRegisterClass(fClass)
BOOL AFXAPI AfxEndDeferRegisterClass(LONG fToRegister)
{
wndcls.lpfnWndProc = DefWindowProc; 	//（b）
wndcls.hInstance = AfxGetInstanceHandle();
wndcls.hCursor = afxData.hcurArrow;
if (fToRegister & AFX_WNDOLECONTROL_REG)
{
// OLE Control windows - use parent DC for speed
wndcls.style |= CS_PARENTDC | CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW;
wndcls.lpszClassName = _afxWndOleControl;	//变量值为 "AfxOleControl80sd"
if (AfxRegisterClass(&wndcls))		//（a）
fRegisteredClasses |= AFX_WNDOLECONTROL_REG;
}
}
（a）：
BOOL AFXAPI AfxRegisterClass(WNDCLASS* lpWndClass)
{
AfxCtxGetClassInfo(lpWndClass->hInstance, lpWndClass->lpszClassName, &wndcls)；
::AfxCtxRegisterClass(lpWndClass)；
}
（b）:
LRESULT COleControl::DefWindowProc(UINT nMsg, WPARAM wParam, LPARAM lParam)
{
if (m_hWnd != NULL)
return CWnd::DefWindowProc(nMsg, wParam, lParam);
}
LRESULT CWnd::DefWindowProc(UINT nMsg, WPARAM wParam, LPARAM lParam)
{
if (m_pfnSuper != NULL)
return ::CallWindowProc(m_pfnSuper, m_hWnd, nMsg, wParam, lParam);

WNDPROC pfnWndProc;
if ((pfnWndProc = *GetSuperWndProcAddr()) == NULL)
return ::DefWindowProc(m_hWnd, nMsg, wParam, lParam);
else
return ::CallWindowProc(pfnWndProc, m_hWnd, nMsg, wParam, lParam);
}