网页通过External接口与WebBrowser交互

在上一篇Blog
中谈到在WTL中添加IDL用于通过向导实现IDispatch，是要付出代价的，而且代价还不小，所以最后我还是用了最简单有效的方法。

这里就把这样一个例子代码帖子下面：

下面是我的IDispatch的实现，其中的MainDlg就是WTL向导生成的非模态对话框，可以根据自己的需求去掉。

/* -------------------------------------------------------------------------
//	FileName	：	BrowserExternal.h
//	Creator		：	linyehui
//	Date		：	2009/12/17 21:36:36
//	Brief		：
//
//	$Id: $
// -----------------------------------------------------------------------*/
#ifndef __BROWSEREXTERNAL_H__
#define __BROWSEREXTERNAL_H__
// -------------------------------------------------------------------------
class CMainDlg;
class CBrowserExternal : public IDispatch
{
protected:
ULONG               m_cRef;
public:
CBrowserExternal(void);
~CBrowserExternal(void);
STDMETHODIMP QueryInterface(REFIID, void **);
STDMETHODIMP_(ULONG) AddRef(void);
STDMETHODIMP_(ULONG) Release(void);
//IDispatch
STDMETHODIMP GetTypeInfoCount(UINT* pctinfo);
STDMETHODIMP GetTypeInfo(/* [in] */ UINT iTInfo,
/* [in] */ LCID lcid,
/* [out] */ ITypeInfo** ppTInfo);
STDMETHODIMP GetIDsOfNames(
/* [in] */ REFIID riid,
/* [size_is][in] */ LPOLESTR *rgszNames,
/* [in] */ UINT cNames,
/* [in] */ LCID lcid,
/* [size_is][out] */ DISPID *rgDispId);
STDMETHODIMP Invoke(
/* [in] */ DISPID dispIdMember,
/* [in] */ REFIID riid,
/* [in] */ LCID lcid,
/* [in] */ WORD wFlags,
/* [out][in] */ DISPPARAMS  *pDispParams,
/* [out] */ VARIANT  *pVarResult,
/* [out] */ EXCEPINFO *pExcepInfo,
/* [out] */ UINT *puArgErr);
public:
BOOL Init(CMainDlg* pMainDlg);
private:
CMainDlg*		m_pMainDlg;
};
// -------------------------------------------------------------------------
// $Log: $
#endif /* __BROWSEREXTERNAL_H__ */

/* -------------------------------------------------------------------------
//	FileName	：	BrowserExternal.cpp
//	Creator		：	linyehui
//	Date		：	2009/12/17 21:38:07
//	Brief		：
//
//	$Id: $
// -----------------------------------------------------------------------*/
#include "stdafx.h"
#include "BrowserExternal.h"
#include "MainDlg.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
// -------------------------------------------------------------------------
// 每添加一个函数都要在这里添加，并在GetIDsOfName和Invoke中相应添加代码
const CString KKMethod_IsOurCustomBrowser		= "KK_IsOurCustomBrowser";
const CString KKMethod_Close					= "KK_Close";
const CString KKMethod_FullScreen				= "KK_FullScreen";
const CString KKMethod_SetWindowSize			= "KK_SetWindowSize";
#define DISPID_KK_IsOurCustomBrowser			1
#define DISPID_KK_Close							2
#define DISPID_KK_FullScreen					3
#define DISPID_KK_SetWindowSize					4

// -------------------------------------------------------------------------

/*
* CBrowserExternal::CBrowserExternal
* CBrowserExternal::~CBrowserExternal
*
* Parameters (Constructor):
*  pSite           PCSite of the site we're in.
*  pUnkOuter       LPUNKNOWN to which we delegate.
*/
CBrowserExternal::CBrowserExternal( void )
{
m_cRef = 0;
}
CBrowserExternal::~CBrowserExternal( void )
{
ASSERT( m_cRef == 0 );
}

/*
* CBrowserExternal::QueryInterface
* CBrowserExternal::AddRef
* CBrowserExternal::Release
*
* Purpose:
*  IUnknown members for CBrowserExternal object.
*/
STDMETHODIMP CBrowserExternal::QueryInterface( REFIID riid, void **ppv )
{
*ppv = NULL;

if ( IID_IDispatch == riid )
{
*ppv = this;
}
if ( NULL != *ppv )
{
((LPUNKNOWN)*ppv)->AddRef();
return NOERROR;
}
return E_NOINTERFACE;
}

STDMETHODIMP_(ULONG) CBrowserExternal::AddRef(void)
{
return ++m_cRef;
}
STDMETHODIMP_(ULONG) CBrowserExternal::Release(void)
{
return --m_cRef;
}

//IDispatch
STDMETHODIMP CBrowserExternal::GetTypeInfoCount(UINT* /*pctinfo*/)
{
return E_NOTIMPL;
}
STDMETHODIMP CBrowserExternal::GetTypeInfo(
/* [in] */ UINT /*iTInfo*/,
/* [in] */ LCID /*lcid*/,
/* [out] */ ITypeInfo** /*ppTInfo*/)
{
return E_NOTIMPL;
}
STDMETHODIMP CBrowserExternal::GetIDsOfNames(
/* [in] */ REFIID riid,
/* [size_is][in] */ OLECHAR** rgszNames,
/* [in] */ UINT cNames,
/* [in] */ LCID lcid,
/* [size_is][out] */ DISPID* rgDispId)
{
HRESULT hr;
UINT	i;
// Assume some degree of success
hr = NOERROR;

for ( i=0; i < cNames; i++) {
CString cszName  = rgszNames[i];
if(cszName == KKMethod_IsOurCustomBrowser)
{
rgDispId[i] = DISPID_KK_IsOurCustomBrowser;
}
else if(cszName == KKMethod_Close)
{
rgDispId[i] = DISPID_KK_Close;
}
else if(cszName == KKMethod_FullScreen)
{
rgDispId[i] = DISPID_KK_FullScreen;
}
else if(cszName == KKMethod_SetWindowSize)
{
rgDispId[i] = DISPID_KK_SetWindowSize;
}
else {
// One or more are unknown so set the return code accordingly
hr = ResultFromScode(DISP_E_UNKNOWNNAME);
rgDispId[i] = DISPID_UNKNOWN;
}
}
return hr;
}
STDMETHODIMP CBrowserExternal::Invoke(
/* [in] */ DISPID dispIdMember,
/* [in] */ REFIID /*riid*/,
/* [in] */ LCID /*lcid*/,
/* [in] */ WORD wFlags,
/* [out][in] */ DISPPARAMS* pDispParams,
/* [out] */ VARIANT* pVarResult,
/* [out] */ EXCEPINFO* /*pExcepInfo*/,
/* [out] */ UINT* puArgErr)
{
if(dispIdMember == DISPID_KK_IsOurCustomBrowser)
{
if(wFlags & DISPATCH_PROPERTYGET)
{
if(pVarResult != NULL)
{
VariantInit(pVarResult);
V_VT(pVarResult)=VT_BOOL;
V_BOOL(pVarResult) = true;
}
}
if ( wFlags & DISPATCH_METHOD )
{
BOOL bResult = m_pMainDlg->KK_IsOurCustomBrowser();
VariantInit(pVarResult);
V_VT(pVarResult)=VT_BOOL;
V_BOOL(pVarResult) = bResult;
}
}
if(dispIdMember == DISPID_KK_Close)
{
if(wFlags & DISPATCH_PROPERTYGET)
{
if(pVarResult != NULL)
{
VariantInit(pVarResult);
V_VT(pVarResult)=VT_BOOL;
V_BOOL(pVarResult) = true;
}
}
if ( wFlags & DISPATCH_METHOD )
{
m_pMainDlg->KK_Close();
}
}

if(dispIdMember == DISPID_KK_FullScreen)
{
if(wFlags & DISPATCH_PROPERTYGET)
{
if(pVarResult != NULL)
{
VariantInit(pVarResult);
V_VT(pVarResult)=VT_BOOL;
V_BOOL(pVarResult) = true;
}
}
if ( wFlags & DISPATCH_METHOD )
{
m_pMainDlg->KK_FullScreen();
}

}
if(dispIdMember == DISPID_KK_SetWindowSize)
{
if(wFlags & DISPATCH_PROPERTYGET)
{
if(pVarResult != NULL)
{
VariantInit(pVarResult);
V_VT(pVarResult)=VT_BOOL;
V_BOOL(pVarResult) = true;
}
}
if ( wFlags & DISPATCH_METHOD )
{
//arguments come in reverse order
// Invoke中的参数顺序是逆序的
int nArg1 = pDispParams->rgvarg[1].intVal;
int nArg2 = pDispParams->rgvarg[0].intVal;
m_pMainDlg->KK_SetWindowSize(nArg1, nArg2);
}
}
return S_OK;
}
//////////////////////////////////////////////////////////////////////////
// public method
BOOL CBrowserExternal::Init(CMainDlg* pMainDlg)
{
if (NULL == pMainDlg)
return FALSE;
m_pMainDlg = pMainDlg;
return TRUE;
}
// -------------------------------------------------------------------------
// $Log: $

完整的代码例子在下面的图片里，右键“图片另存为”后修改文件后缀名为.rar，就可以解压出代码：



--The End--