Basic Control Containment基本的控制容器[1]

最新推荐文章于 2025-07-19 14:33:57 发布

原创最新推荐文章于 2025-07-19 14:33:57 发布 · 900 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#basic #null #callback #interface #class

本文详细解析了CWindow中的窗口过程调用机制，包括如何通过StartWindowProc处理消息，以及thunk机制的应用。同时介绍了CAxHostWindow对象的创建流程，涉及窗口类注册、控制项创建及接口调用等关键步骤。

首先回顾一下CWindow中的窗口过程：

#define DECLARE_WND_CLASS(WndClassName) /
static ATL::CWndClassInfo& GetWndClassInfo() /
{ /
static ATL::CWndClassInfo wc = /
{ /
{ sizeof(WNDCLASSEX), CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS, StartWindowProc, /
0, 0, NULL, NULL, NULL, (HBRUSH)(COLOR_WINDOW + 1), NULL, WndClassName, NULL }, /
NULL, NULL, IDC_ARROW, TRUE, 0, _T("") /
}; /
return wc; /
}

指定了窗口过程StartWindowProc.

然后通过pThis->m_thunk.Init(WindowProc, pThis); thunk机制调换了

static LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)中

的HWND为CContainedWindowT< TBase >* pThis = (CContainedWindowT< TBase >*)hWnd;

接下来就利用多态调用

BOOL bRet = pThis->m_pObject->ProcessWindowMessage(pThis->m_hWnd, uMsg, wParam, lParam, lRes, pThis->m_dwMsgMapID);

该函数是通过宏定义

#define BEGIN_MSG_MAP(theClass) /
public: /
BOOL ProcessWindowMessage(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT& lResult, DWORD dwMsgMapID = 0) /
{ /
BOOL bHandled = TRUE; /
(hWnd); /
(uMsg); /
(wParam); /
(lParam); /
(lResult); /
(bHandled); /
switch(dwMsgMapID) /
{ /
case 0:

若这个函数返回FALSE，则跳转到DefWindowProc

if(uMsg != WM_NCDESTROY)
lRes = pThis->DefWindowProc(uMsg, wParam, lParam);

以上就是关于CWindow中的窗口过程调用。

接下来看一下CAxHostWindow对象是如何被创建的。在CMainWindow中：

CAxWindow m_bullseyeWin;

m_bullseyeWin.Create( m_hWnd, rect, controlName, WS_CHILD | WS_VISIBLE, 0, ID_BULLSEYE );

其中就指定了CLASSNAME GetWndClassName() = ATLAXWIN_CLASS,该宏正是"AtlAxWin80"

该窗口类在AtlAxWinInit()注册的时候，使用的是wc.lpfnWndProc = AtlAxWindowProc;

来看一下window procedure AtlAxWindowProc:

在其中调用了HRESULT hRet = AtlAxCreateControlLic(T2COLE_EX_DEF(spName), hWnd, spStream, &spUnk, NULL);

将spName传递进去，并最终调用了AtlAcCreateControlLicEx(atlHost.h LN1980)

hr = CAxHostWindow::_CreatorClass::CreateInstance(NULL, __uuidof(IUnknown), (void**)&spUnkContainer);
if (SUCCEEDED(hr))
{
CComPtr pAxWindow;
spUnkContainer->QueryInterface(__uuidof(IAxWinHostWindow), (void**)&pAxWindow);
CComBSTR bstrName(lpszName);
hr = pAxWindow->CreateControlLicEx(bstrName, hWnd, pStream, &spUnkControl, iidSink, punkSink, bstrLic);
}

interface IAxWinHostWindow : IUnknown {

HRESULT CreateControl([in] LPCOLESTR lpTricsData, [in] HWND hWnd, [in] IStream* pStream);

HRESULT CreateControlEx([in] LPCOLESTR lpTricsData, [in] HWND hWnd, [in] IStream* pStream, [out] IUnknown** ppUnk, [in] REFIID riidAdvise, [in] IUnknown* punkAdvise);

HRESULT AttachControl([in] IUnknown* pUnkControl, [in] HWND hWnd);

HRESULT QueryControl([in] REFIID riid, [out, iid_is(riid)] void **ppvObject);

HRESULT SetExternalDispatch([in] IDispatch* pDisp); HRESULT SetExternalUIHandler( [in] IDocHostUIHandlerDispatch* pDisp); };

// TODO 复习SubclassWindow,即子类化

http://www.vckbase.com/document/viewdoc/?id=1119